1
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Yang ZH, Huang LF, Wang YS, Chang CC. Turn-off enzyme activity of histidine-rich peptides for the detection of lysozyme. Mikrochim Acta 2024; 191:307. [PMID: 38713296 DOI: 10.1007/s00604-024-06388-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 04/25/2024] [Indexed: 05/08/2024]
Abstract
An assay that integrates histidine-rich peptides (HisRPs) with high-affinity aptamers was developed enabling the specific and sensitive determination of the target lysozyme. The enzyme-like activity of HisRP is inhibited by its interaction with a target recognized by an aptamer. In the presence of the target, lysozyme molecules progressively assemble on the surface of HisRP in a concentration-dependent manner, resulting in the gradual suppression of enzyme-like activity. This inhibition of HisRP's enzyme-like activity can be visually observed through color changes in the reaction product or quantified using UV-visible absorption spectroscopy. Under optimal conditions, the proposed colorimetric assay for lysozyme had a detection limit as low as 1 nM and exhibited excellent selectivity against other nonspecific interferents. Furthermore, subsequent research validated the practical applicability of the developed colorimetric approach to saliva samples, indicating that the assay holds significant potential for the detection of lysozymes in samples derived from humans.
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Affiliation(s)
- Zu-Han Yang
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan, 333, Taiwan
| | - Ling-Fang Huang
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan, 333, Taiwan
- Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan, 333, Taiwan
| | - Yi-Shan Wang
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan, 333, Taiwan
- Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan, 333, Taiwan
| | - Chia-Chen Chang
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Taoyuan, 333, Taiwan.
- Graduate Institute of Biomedical Sciences, Chang Gung University, Taoyuan, 333, Taiwan.
- Kidney Research Center, Department of Nephrology, Linkou Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.
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2
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Ghosh R, Nair RR, Ghosh S, Debnath S, Chatterjee PB. A Water-Soluble Wavy Coordination Polymer of Cu(II) as a Turn-On Luminescent Probe for Histidine and Histidine-Rich Proteins/Peptides. Inorg Chem 2024; 63:8320-8328. [PMID: 38660721 DOI: 10.1021/acs.inorgchem.4c00665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
Histidine plays an essential role in most biological systems. Changes in the homeostasis of histidine and histidine-rich proteins are connected to several diseases. Herein, we report a water-soluble Cu(II) coordination polymer, labeled CuCP, for the fluorimetric detection of histidine and histidine-rich proteins and peptides. Single-crystal structure determination of CuCP revealed a two-dimensional wavy network structure in which a carboxylate group connects the individual Cu(II) dimer unit in a syn-anti conformation. The weakly luminescent and water-soluble CuCP shows turn-on blue emission in the presence of histidine and histidine-rich peptides and proteins. The polymer can also stain histidine-rich proteins via gel electrophoresis. The limits of quantifications for histidine, glycine-histidine, serine-histidine, human serum albumin (HSA), bovine serum albumin, pepsin, trypsin, and lysozyme were found to be 300, 160, 600, 300, 600, 800, 120, and 290 nM, respectively. Utilizing the fluorescence turn-on property of CuCP, we measured HSA quantitatively in the urine samples. We also validated the present urinary HSA measurement assay with existing analytical techniques. Job's plot, 1H NMR, high-resolution mass spectrometry (HRMS), electron paramagnetic resonance (EPR), fluorescence, and UV-vis studies confirmed the ligand displacement from CuCP in the presence of histidine.
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Affiliation(s)
- Riya Ghosh
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI, G. B. Marg, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ratish R Nair
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI, G. B. Marg, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Shibaji Ghosh
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI, G. B. Marg, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Snehasish Debnath
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI, G. B. Marg, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pabitra B Chatterjee
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI, G. B. Marg, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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3
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Feng X, Ma R, Wang Y, Tong L, Wen W, Mu T, Tian J, Yu B, Gu Y, Zhang J. Non-targeted metabolomics identifies biomarkers in milk with high and low milk fat percentage. Food Res Int 2024; 179:113989. [PMID: 38342531 DOI: 10.1016/j.foodres.2024.113989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/30/2023] [Accepted: 01/05/2024] [Indexed: 02/13/2024]
Abstract
Milk is widely recognized as an important food source with health benefits. Different consumer groups have different requirements for the content and proportion of milk fat; therefore, it is necessary to investigate the differential metabolites and their regulatory mechanisms in milk with high and low milk fat percentages (MFP). In this study, untargeted metabolomics was performed on milk samples from 13 cows with high milk fat percentage (HF) and 13 cows with low milk fat percentage (LF) using ultra-high performance liquid chromatography coupled with mass spectrometry (UHPLC-MS/MS). Forty-eight potential differentially labeled compounds were screened using the orthogonal partial least squares-discriminant analysis (OPLS-DA) combined with the weighted gene co-expression network analysis (WGCNA) method. Amino acid metabolism was the key metabolic pathway with significant enrichment of L-histidine, 5-oxoproline, L-aspartic acid, and L-glutamic acid. The negative correlation with MFP differentiated the HF and LF groups. To further determine the potential regulatory role of these amino acids on milk fat metabolism, the expression levels of marker genes in the milk fat synthesis pathway were explored. It was noticed that L-histidine reduced milk fat concentration primarily by inhibiting the triglycerides (TAG) synthesis pathway. L-aspartic acid and L-glutamic acid inhibited milk fat synthesis through the fatty acid de novo and TAG synthesis pathways. This study provides new insights into the mechanism underlying milk fat synthesis and milk quality improvement.
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Affiliation(s)
- Xiaofang Feng
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Ruoshuang Ma
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Ying Wang
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Lijia Tong
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Wan Wen
- Animal Husbandry Extension Station, Yinchuan, China
| | - Tong Mu
- School of Life Science, Yan'an University, Yanan 716000, China
| | - Jia Tian
- Animal Husbandry Extension Station, Yinchuan, China
| | - Baojun Yu
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Yaling Gu
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China
| | - Juan Zhang
- College of Animal Science and Technology, Ningxia University, Yinchuan 750021, China.
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Nakamura R, Tomizawa I, Iwai A, Ikeda T, Hirayama K, Chiu YW, Suzuki T, Tarutani A, Mano T, Iwata A, Toda T, Sohma Y, Kanai M, Hori Y, Tomita T. Photo-oxygenation of histidine residue inhibits α-synuclein aggregation. FASEB J 2023; 37:e23311. [PMID: 37962096 DOI: 10.1096/fj.202301533r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 10/14/2023] [Accepted: 11/01/2023] [Indexed: 11/15/2023]
Abstract
Aggregation of α-synuclein (α-syn) into amyloid is the pathological hallmark of several neurodegenerative disorders, including Parkinson disease, dementia with Lewy bodies, and multiple system atrophy. It is widely accepted that α-syn aggregation is associated with neurodegeneration, although the mechanisms are not yet fully understood. Therefore, the inhibition of α-syn aggregation is a potential therapeutic approach against these diseases. This study used the photocatalyst for α-syn photo-oxygenation, which selectively adds oxygen atoms to fibrils. Our findings demonstrate that photo-oxygenation using this photocatalyst successfully inhibits α-syn aggregation, particularly by reducing its seeding ability. Notably, we also discovered that photo-oxygenation of the histidine at the 50th residue in α-syn aggregates is responsible for the inhibitory effect. These findings indicate that photo-oxygenation of the histidine residue in α-syn is a potential therapeutic strategy for synucleinopathies.
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Affiliation(s)
- Reito Nakamura
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Ikumi Tomizawa
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Atsushi Iwai
- Laboratory of Synthetic Organic Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Tetsuo Ikeda
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Kota Hirayama
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yung Wen Chiu
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Takanobu Suzuki
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Airi Tarutani
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Tatsuo Mano
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Atsushi Iwata
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Department of Neurology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan
| | - Tatsushi Toda
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Youhei Sohma
- Laboratory of Synthetic Organic Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Wakayama Medical University, Wakayama, Japan
| | - Motomu Kanai
- Laboratory of Synthetic Organic Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yukiko Hori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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Richter C, Behringer V, Manig F, Henle T, Hohmann G, Zierau O. Traces of dietary patterns in saliva of hominids: Profiling salivary amino acid fingerprints in great apes and humans. J Hum Evol 2023; 175:103305. [PMID: 36586354 DOI: 10.1016/j.jhevol.2022.103305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 11/22/2022] [Accepted: 11/22/2022] [Indexed: 12/31/2022]
Abstract
Herbivorous animals that regularly consume tannin-rich food are known to secrete certain tannin-binding salivary proteins (TBSPs), especially proline-rich proteins and histidine-rich proteins, as an effective measure to counteract the antinutritive effects of dietary tannins. Due to their high binding capacity, TBSPs complex with tannins in the oral cavity, and thereby protect dietary proteins and digestive enzymes. Although the natural diet of great apes (Hominidae) is biased toward ripe fruits, analyses of food plants revealed that their natural diet contains considerable amounts of tannins, which is raising the question of possible counter-measures to cope with dietary tannins. In our study, we investigated the salivary amino acid profiles of zoo-housed Pan paniscus, Pan troglodytes, Gorilla gorilla, and Pongo abelii, and compared their results with corresponding data from Homo sapiens. Individual saliva samples of 42 apes and 17 humans were collected and quantitated by amino acid analysis, using cation-exchange chromatography with postcolumn derivatization, following acid hydrolysis. We found species-specific differences in the salivary amino acid profiles with average total salivary protein concentration ranging from 308.8 mg/dL in Po. abelii to 1165.6 mg/dL in G. gorilla. Total salivary protein was consistently higher in ape than in human saliva samples (174 mg/dL). All apes had on average also higher relative proline levels than humans did. Histidine levels had the highest concentration in the samples from Po. abelii followed by P. paniscus. In all ape species, the high salivary concentrations of proline and histidine are considered to be indicative of high concentrations of TBSPs in hominids. Given that the species differences in salivary composition obtained in this study correspond with overall patterns of secondary compound content in the diet of wild populations, we assume that salivary composition is resilient to acute and long-lasting changes in diet composition in general and tannin content in particular.
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Affiliation(s)
- Carolin Richter
- Institute of Zoology, Technische Universität Dresden, Zellescher Weg 20b, 01062 Dresden, Germany.
| | - Verena Behringer
- Institute of Zoology, Technische Universität Dresden, Zellescher Weg 20b, 01062 Dresden, Germany; Endocrinology Laboratory, German Primate Center, Leibniz Institute for Primate Research, Kellnerweg 4, 37077 Göttingen, Germany; Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - Friederike Manig
- Institute of Food Chemistry, Technische Universität Dresden, Bergstrasse 66, 01062 Dresden, Germany
| | - Thomas Henle
- Institute of Food Chemistry, Technische Universität Dresden, Bergstrasse 66, 01062 Dresden, Germany
| | - Gottfried Hohmann
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - Oliver Zierau
- Institute of Zoology, Technische Universität Dresden, Zellescher Weg 20b, 01062 Dresden, Germany
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6
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Liu S, Li C, Chu M, Zhang W, Wang W, Wang Y, Guo X, Deng F. Associations of forest negative air ions exposure with cardiac autonomic nervous function and the related metabolic linkages: A repeated-measure panel study. Sci Total Environ 2022; 850:158019. [PMID: 35973547 DOI: 10.1016/j.scitotenv.2022.158019] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 07/29/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Forest environment has many health benefits, and negative air ions (NAI) is one of the major forest environmental factors. Many studies have explored the effect of forest environment on cardiac autonomic nervous function, while forest NAI in the among function and the underlying mechanism still remain unclear. To explore the associations and molecular linkages between short-term exposure to forest NAI and heart rate variability (HRV), a repeated-measure panel study was conducted among 31 healthy adults. Participants were randomly selected to stay in a forest park for 3 days and 2 nights. Individual exposures including NAI were monitored simultaneously and HRV indices were measured repeatedly at the follow-up period. Urine samples were collected for non-targeted metabolomics analysis. Mixed-effect models were adopted to evaluate associations among NAI, HRV indices and metabolites. The median of NAI concentration was 68.11 (138.20) cm-3 during the study period. Short-term exposure to forest NAI was associated with the ameliorative HRV indices, especially the excitatory parasympathetic nerve. For instance, per interquartile range increase of 5-min moving average of NAI was associated with 9.99 % (95%CI: 8.95 %, 11.03 %) increase of power in high frequency. Eight metabolites were associated with NAI exposure. The down-regulated tyrosine metabolism was firstly observed, followed by other amino acid metabolic alterations. The NAI-related metabolic changes reflect the reduction of inflammation and oxidative stress. HRV indices were associated with 25 metabolites, mainly including arginine, proline and histidine metabolism. Short-term exposure to forest NAI is beneficial to HRV, especially to the parasympathetic nerve activity, by successively disturbing different metabolic pathways which mainly reflect the increased anti-inflammation and the reduced inflammation. The results will provide epidemiological evidences for developing forest therapy and improving cardiac autonomic nervous function.
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Affiliation(s)
- Shan Liu
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Chen Li
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Mengtian Chu
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Wenlou Zhang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Wanzhou Wang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Yazheng Wang
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Xinbiao Guo
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China
| | - Furong Deng
- Department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100191, China.
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7
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Jagt JZ, Struys EA, Ayada I, Bakkali A, Jansen EEW, Claesen J, van Limbergen JE, Benninga MA, de Boer NKH, de Meij TGJ. Fecal Amino Acid Analysis in Newly Diagnosed Pediatric Inflammatory Bowel Disease: A Multicenter Case-Control Study. Inflamm Bowel Dis 2022; 28:755-763. [PMID: 34757415 PMCID: PMC9074868 DOI: 10.1093/ibd/izab256] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND Fecal metabolomic profiles differ between pediatric inflammatory bowel disease (IBD) patients and controls and may provide new insights in the pathophysiology of IBD. The role of amino acids, however, is not fully elucidated. We aimed to assess fecal amino acid profiles in pediatric IBD. METHODS In this case-control study, treatment-naïve, newly diagnosed pediatric IBD patients and a non-IBD control group, matched based on sex and age, were included in 2 tertiary centres. Fecal amino acid profiles were assessed using a targeted high-performance liquid chromatography technique. A random forest classifier method was used to develop a prediction model differentiating IBD from controls and predicting IBD phenotype. The association between IBD localization and amino acid concentrations was tested with ordinal regression models. RESULTS We included 78 newly diagnosed IBD patients (40 Crohn's disease [CD], 38 ulcerative colitis [UC]) and 105 controls. Patients with IBD could be differentiated from controls with an accuracy of 82% (sensitivity 63%, specificity 97%). Twenty-nine out of the 42 measured unique amino acids were included in the prediction model. Increased levels of tryptophan, taurine, alanine, ornithine, valine, histidine, and leucine were the most differentiating features. Children with CD and UC could be differentiated from the controls with an accuracy of 80% and 90%, respectively. Inflammatory bowel disease phenotype could not be predicted. Tryptophan, valine, and histidine levels were positively associated with more extended disease in UC patients (P < .05). CONCLUSIONS Fecal amino acids may enhance understanding of the role of host-microbial interactions in the pathophysiology of IBD and may evolve into biomarkers for pediatric IBD diagnostic and personalized medicine.
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Affiliation(s)
- Jasmijn Z Jagt
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Eduard A Struys
- Department of Clinical Chemistry, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Ibrahim Ayada
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Abdellatif Bakkali
- Department of Clinical Chemistry, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Erwin E W Jansen
- Department of Clinical Chemistry, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Jürgen Claesen
- Department of Epidemiology and Data Science, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Johan E van Limbergen
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Academic Medical Centre, 1105 AZ Amsterdam, The Netherlands
| | - Marc A Benninga
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Academic Medical Centre, 1105 AZ Amsterdam, The Netherlands
| | - Nanne K H de Boer
- Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology and Metabolism Research Institute, Amsterdam UMC, Vrije universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Tim G J de Meij
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
- Department of Pediatric Gastroenterology, Emma Children’s Hospital, Amsterdam UMC, Academic Medical Centre, 1105 AZ Amsterdam, The Netherlands
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Karazan ZM, Roushani M. A novel electrochemical sensor for the determination of histidine based on a molecularly imprinted copolymer. Anal Methods 2021; 13:4904-4910. [PMID: 34606533 DOI: 10.1039/d1ay01492g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The present study aimed to report a novel electrochemical sensor through electropolymerization of o-aminophenol (o-AP) and m-dihydroxy benzene (m-DB) as monomers on the surface of the glassy carbon electrode (GCE) for the determination of histidine (His) as a template molecule. The developed sensor exhibited satisfactory sensitivity and high selectivity, and also offered a linear range between 0.005 and 10.0 μM with a detection limit of 0.9 nM. Finally, it is worth mentioning that we also aimed at employing the proposed sensor for the detection of His in blood serum samples.
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Affiliation(s)
- Zahra Mirzaei Karazan
- Department of Chemistry, Faculty of Sciences, Ilam University, P. O. Box, Ilam 69315-516, Iran.
| | - Mahmoud Roushani
- Department of Chemistry, Faculty of Sciences, Ilam University, P. O. Box, Ilam 69315-516, Iran.
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9
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Wang HB, Mao AL, Tao BB, Zhang HD, Xiao ZL, Liu YM. L-Histidine-DNA interaction: a strategy for the improvement of the fluorescence signal of poly(adenine) DNA-templated gold nanoclusters. Mikrochim Acta 2021; 188:198. [PMID: 34041600 DOI: 10.1007/s00604-021-04853-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 05/11/2021] [Indexed: 11/25/2022]
Abstract
An interesting phenomenon is described that the fluorescence signal of poly(adenine) (A) DNA-templated gold nanoclusters (AuNCs) is greatly improved in the presence of L-histidine by means of L-histidine-DNA interaction. The modified nanoclusters display strong fluorescence emission with excitation/emission maxima at 290/475 nm. The fluorescence quantum yield (QY) is improved from 1.9 to 6.5%. Fluorescence enhancement is mainly ascribed to the L-histidine-DNA interaction leading to conformational changes of the poly(A) DNA template, which offer a better microenvironment to protect AuNCs. The assay enables L-histidine to be determined with good sensitivity and a linear response that covers the 1 to 50 nM L-histidine concentration range with a 0.3 nM limit of detection. The proposed method has been applied to the determination of imidazole-containing drugs in pharmaceutical samples. A turn-on fluorescent method has been designed for the sensitive detection of L-histidine as well as imidazole-containing drugs on the basis of the L-histidine-DNA interaction.
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Affiliation(s)
- Hai-Bo Wang
- College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, People's Republic of China.
| | - An-Li Mao
- College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Bei-Bei Tao
- College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Hong-Ding Zhang
- College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Zhong-Liang Xiao
- School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, People's Republic of China
| | - Yan-Ming Liu
- College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, People's Republic of China
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10
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Imas JJ, Ruiz Zamarreño C, Zubiate P, Sanchez-Martín L, Campión J, Matías IR. Optical Biosensors for the Detection of Rheumatoid Arthritis (RA) Biomarkers: A Comprehensive Review. Sensors (Basel) 2020; 20:s20216289. [PMID: 33158306 PMCID: PMC7663853 DOI: 10.3390/s20216289] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 10/23/2020] [Accepted: 10/29/2020] [Indexed: 12/13/2022]
Abstract
A comprehensive review of optical biosensors for the detection of biomarkers associated with rheumatoid arthritis (RA) is presented here, including microRNAs (miRNAs), C-reactive protein (CRP), rheumatoid factor (RF), anti-citrullinated protein antibodies (ACPA), interleukin-6 (IL-6) and histidine, which are biomarkers that enable RA detection and/or monitoring. An overview of the different optical biosensors (based on fluorescence, plasmon resonances, interferometry, surface-enhanced Raman spectroscopy (SERS) among other optical techniques) used to detect these biomarkers is given, describing their performance and main characteristics (limit of detection (LOD) and dynamic range), as well as the connection between the respective biomarker and rheumatoid arthritis. It has been observed that the relationship between the corresponding biomarker and rheumatoid arthritis tends to be obviated most of the time when explaining the mechanism of the optical biosensor, which forces the researcher to look for further information about the biomarker. This review work attempts to establish a clear association between optical sensors and rheumatoid arthritis biomarkers as well as to be an easy-to-use tool for the researchers working in this field.
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Affiliation(s)
- José Javier Imas
- Electrical, Electronics and Communications Engineering Department, Public University of Navarra, 31006 Pamplona, Spain; (J.J.I.); (P.Z.); (I.R.M.)
- Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain
| | - Carlos Ruiz Zamarreño
- Electrical, Electronics and Communications Engineering Department, Public University of Navarra, 31006 Pamplona, Spain; (J.J.I.); (P.Z.); (I.R.M.)
- Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain
- Correspondence:
| | - Pablo Zubiate
- Electrical, Electronics and Communications Engineering Department, Public University of Navarra, 31006 Pamplona, Spain; (J.J.I.); (P.Z.); (I.R.M.)
| | | | - Javier Campión
- Making Genetics S.L., Plaza CEIN 5, 31110 Noáin, Spain; (L.S.-M.); (J.C.)
| | - Ignacio Raúl Matías
- Electrical, Electronics and Communications Engineering Department, Public University of Navarra, 31006 Pamplona, Spain; (J.J.I.); (P.Z.); (I.R.M.)
- Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain
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11
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Raducanu VS, Isaioglou I, Raducanu DV, Merzaban JS, Hamdan SM. Simplified detection of polyhistidine-tagged proteins in gels and membranes using a UV-excitable dye and a multiple chelator head pair. J Biol Chem 2020; 295:12214-12223. [PMID: 32647010 PMCID: PMC7443479 DOI: 10.1074/jbc.ra120.014132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/29/2020] [Indexed: 12/22/2022] Open
Abstract
The polyhistidine tag (His-tag) is one of the most popular protein tags used in the life sciences. Traditionally, the detection of His-tagged proteins relies on immunoblotting with anti-His antibodies. This approach is laborious for certain applications, such as protein purification, where time and simplicity are critical. The His-tag can also be directly detected by metal ion-loaded nickel-nitrilotriacetic acid-based chelator heads conjugated to fluorophores, which is a convenient alternative method to immunoblotting. Typically, such chelator heads are conjugated to either green or red fluorophores, the detection of which requires specialized excitation sources and detection systems. Here, we demonstrate that post-run staining is ideal for His-tag detection by metal ion-loaded and fluorescently labeled chelator heads in PAGE and blot membranes. Additionally, by comparing the performances of different chelator heads, we show how differences in microscopic affinity constants translate to macroscopic differences in the detection limits in environments with limited diffusion, such as PAGE. On the basis of these results, we devise a simple approach, called UVHis-PAGE, that uses metal ion-loaded and fluorescently labeled chelator heads to detect His-tagged proteins in PAGE and blot membranes. Our method uses a UV transilluminator as an excitation source, and the results can be visually inspected by the naked eye.
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Affiliation(s)
- Vlad-Stefan Raducanu
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Ioannis Isaioglou
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Daniela-Violeta Raducanu
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Jasmeen S Merzaban
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Samir M Hamdan
- Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
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12
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Lee W, Um J, Hwang B, Lee YC, Chung BC, Hong J. Assessing the progression of gastric cancer via profiling of histamine, histidine, and bile acids in gastric juice using LC-MS/MS. J Steroid Biochem Mol Biol 2020; 197:105539. [PMID: 31730800 DOI: 10.1016/j.jsbmb.2019.105539] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 10/18/2019] [Accepted: 11/11/2019] [Indexed: 02/07/2023]
Abstract
Bile acid (BA) imbalance may be directly associated with gastric cancer and indirectly influence stomach carcinogenesis via overexpression of histidine decarboxylase (HDC), which converts histidine (His) into histamine (HIST). Moreover, the progression of gastric cancer, could change the gut microbiome, including bacteria spp. that produce secondary BAs. Gastric juice has various metabolites that could indicate gastric cancer-related stomach conditions. Therefore, profiling of HIST, His, and BAs in gastric juice is crucial for understanding the etiological mechanisms of gastric cancer. We used a profiling method to simultaneously determine targeted metabolites in gastric juice using liquid chromatography-tandem mass spectrometry (LC-MS/MS). We successfully analyzed 70 human gastric juice samples from patients with chronic superficial gastritis (CSG, n = 20), intestinal metaplasia (IM, n = 12), and gastric cancer (n = 38). Furthermore, we investigated the relevance between BA metabolism and gastric cancer. There were statistical differences in the metabolism of cholic acid (CA) into deoxycholic acid (DCA) based on the progression of CSG into IM and gastric cancer. Hence, the progression of gastric cancer might be related to the alterations in gut microbiome composition. We provide insight into the etiological mechanisms of the progression of gastric cancer and biomarkers to diagnose and treat gastric cancer.
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Affiliation(s)
- Wonwoong Lee
- College of Pharmacy, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Jinhee Um
- College of Pharmacy, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Boram Hwang
- Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Yong Chan Lee
- Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Bong Chul Chung
- Molecular Recognition Research Center, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Jongki Hong
- College of Pharmacy, Kyung Hee University, Seoul, 02447, Republic of Korea.
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13
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Koike H, Nozaki K, Iwamura M. Microscopic Imaging of Chiral Amino Acids in Agar Gel through Circularly Polarized Luminescence of Eu III Complex. Chem Asian J 2019; 15:85-90. [PMID: 31729130 DOI: 10.1002/asia.201901495] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Indexed: 02/04/2023]
Abstract
We recently found that [Eu(pda)2 ]- (pda: 1,10-phenanthroline-2,9-dicarboxylic acid), which has an achiral structure in crystals, exhibits circularly polarized luminescence (CPL) in aqueous solutions containing chiral amino acids such as arginine and histidine. CPL measurements were performed for agar gel, which includes an aqueous solution of [Eu(pda)2 ]- and chiral arginine or histidine. The spectral shape, concentration, and pH dependences on CPL intensity in the agar gels were very close to those in aqueous solutions, indicating that the CPL of the EuIII complex in the agar gels was induced by mechanism similar to that in aqueous solutions. We performed spatially resolved CPL measurements using a laboratory-built microscopic CPL spectroscopic system for agar-gel samples, where d- and l- amino acids were separately dispersed. We successfully recorded CPL imaging maps showing spatial dispersions of d- and l-amino acid in the agar gels.
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Affiliation(s)
- Hikaru Koike
- Graduated School of Science and Engineering, University of Toyama, Gofuku, 3190, Toyama, Japan
| | - Koichi Nozaki
- Graduated School of Science and Engineering, University of Toyama, Gofuku, 3190, Toyama, Japan
| | - Munetaka Iwamura
- Graduated School of Science and Engineering, University of Toyama, Gofuku, 3190, Toyama, Japan
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Achouba A, Dumas P, Ouellet N, Little M, Lemire M, Ayotte P. Selenoneine is a major selenium species in beluga skin and red blood cells of Inuit from Nunavik. Chemosphere 2019; 229:549-558. [PMID: 31100626 DOI: 10.1016/j.chemosphere.2019.04.191] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 04/17/2019] [Accepted: 04/24/2019] [Indexed: 05/26/2023]
Abstract
Nunavimmiut (Inuit of Nunavik, Northern Quebec, Canada) exhibit a high selenium (Se) status because of their frequent consumption of marine mammal foods. Indirect evidence from our previous studies had suggested that selenoneine - a novel selenocompound - may be accumulating in the blood of Nunavimmiut. We used a liquid-chromatography/inductively coupled tandem mass spectrometry (LC-ICP-MS/MS) method to measure concentrations of selenoneine and its methylated metabolite Se-methylselenoneine in archived red blood cells (RBC) obtained from 210 Nunavimmiut living in communities along the Hudson Strait, where marine mammal hunting and consumption are most frequent in Nunavik. This method was adapted to quantify selenoneine and its methylated metabolite in beluga mattaaq, an Inuit delicacy consisting of the skin with the underlying layer of fat and the major dietary source of Se for Nunavimmiut. Total selenium concentration was also measured in RBC and beluga mattaaq samples by isotope dilution ICP-MS/MS. The median selenoneine concentration in RBC was 413 μg Se/L (range = 3.20-3230 μg Se/L), representing 54% (median) of total Se content (range = 1.6-91%). Quantification of selenoneine in five beluga mattaaq samples (skin layer) from Nunavik revealed a median concentration of 1.8 μg Se/g wet wt (range = 1.2-7.4 μg Se/g), constituting 54% (median) of the total Se content (range = 44-74%). Se-methylselenoneine was also detected in Inuit RBC but not in beluga mattaaq, suggesting that selenoneine undergoes methylation in humans. Selenoneine may protect Nunavimmiut from methylmecury toxicity by increasing its demethylation in RBC and in turn decreasing its distribution to target organs.
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Affiliation(s)
- Adel Achouba
- Axe Santé des populations et pratiques optimales en santé, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, Chemin Sainte-Foy, Québec, QC, G1S 4L8, Canada
| | - Pierre Dumas
- Centre de Toxicologie du Québec, Institut national de santé publique du Québec (INSPQ), 945 Wolfe, Québec, QC, G1V 5B3, Canada
| | - Nathalie Ouellet
- Axe Santé des populations et pratiques optimales en santé, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, Chemin Sainte-Foy, Québec, QC, G1S 4L8, Canada
| | - Matthew Little
- Axe Santé des populations et pratiques optimales en santé, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, Chemin Sainte-Foy, Québec, QC, G1S 4L8, Canada
| | - Mélanie Lemire
- Axe Santé des populations et pratiques optimales en santé, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, Chemin Sainte-Foy, Québec, QC, G1S 4L8, Canada; Département de médecine préventive et sociale, Université Laval, Pavillon Ferdinand-Vandry, Québec, QC, G1V 0A6, Canada
| | - Pierre Ayotte
- Axe Santé des populations et pratiques optimales en santé, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, Chemin Sainte-Foy, Québec, QC, G1S 4L8, Canada; Centre de Toxicologie du Québec, Institut national de santé publique du Québec (INSPQ), 945 Wolfe, Québec, QC, G1V 5B3, Canada; Département de médecine préventive et sociale, Université Laval, Pavillon Ferdinand-Vandry, Québec, QC, G1V 0A6, Canada.
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Little M, Achouba A, Dumas P, Ouellet N, Ayotte P, Lemire M. Determinants of selenoneine concentration in red blood cells of Inuit from Nunavik (Northern Québec, Canada). Environ Int 2019; 127:243-252. [PMID: 30928848 DOI: 10.1016/j.envint.2018.11.077] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 11/28/2018] [Accepted: 11/29/2018] [Indexed: 06/09/2023]
Abstract
Selenium (Se) is a trace mineral essential to human health, and is especially abundant in marine foods consumed by Inuit populations in Nunavik (northern Quebec, Canada), leading to exceptionally high whole blood Se levels. While most epidemiological studies to date examine plasma or whole blood Se, little is known about the health implications of specific Se biomarkers (e.g. selenoproteins and small Se compounds). Selenoneine, a novel Se compound, is found in high concentrations in marine foods (and particularly beluga mattaaq) and the red blood cells (RBCs) of populations that consume them. We report here RBC selenoneine concentrations in a population of Inuit adults (n = 885) who participated in the Qanuippitaa? 2004 survey. Simple associations between RBC selenoneine and other Se and mercury (Hg) biomarkers were assessed using Spearman correlations and linear regressions. Wilcoxon ranksum tests were used to examine differences in biomarkers and characteristics between tertiles of RBC selenoneine concentration. A multiple linear regression analysis was used to determine factors (sociodemographic, lifestyle, and dietary) associated with RBC selenoneine concentrations. Selenoneine comprised a large proportion of whole blood Se and RBC Se in this population. Age and sex-adjusted geometric mean RBC selenoneine concentration was 118 μg/L (range: 1-3226 μg/L) and was much higher (p = 0.001) among women (150.3 μg/L) than men (87.6 μg/L) across all regions of Nunavik after controlling for age, region, and diet. RBC selenoneine was highly correlated with RBC Se (rs = 0.96, p < 0.001) and whole blood Se (rs = 0.89, p < 0.001), but only weakly correlated with plasma Se (rs = 0.13, p < 0.001). Overall, increasing age (standardized β = 0.24), higher body-mass index (BMI; β = 0.08), female sex (β = 0.10), living in a Hudson Strait community (compared to Hudson Bay and Ungava Bay; β = 0.38), and consuming beluga mattaaq (g/day; β = 0.19) were positively associated with RBC selenoneine. Meanwhile, consumption of market meats (g/day; β = -0.07) was negatively associated with RBC selenoneine. RBC selenoneine is an important biomarker of Se dietary intake from local marine foods in Inuit populations. Further studies are needed to examine the health effects of selenoneine intake and the underlying mechanisms for sex differences among Inuit populations.
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Affiliation(s)
- Matthew Little
- Axe santé des populations et pratiques optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada; Département de Médecine Sociale et Préventive, Université Laval, Pavillon Ferdinand-Vandry, Québec, QC G1V 0A6, Canada.
| | - Adel Achouba
- Axe santé des populations et pratiques optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada
| | - Pierre Dumas
- Centre de Toxicologie du Québec, Institut national de santé publique du Québec (INSPQ), 945 Avenue Wolfe, QC G1V 5B3, Canada
| | - Nathalie Ouellet
- Axe santé des populations et pratiques optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada
| | - Pierre Ayotte
- Axe santé des populations et pratiques optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada; Département de Médecine Sociale et Préventive, Université Laval, Pavillon Ferdinand-Vandry, Québec, QC G1V 0A6, Canada; Centre de Toxicologie du Québec, Institut national de santé publique du Québec (INSPQ), 945 Avenue Wolfe, QC G1V 5B3, Canada
| | - Mélanie Lemire
- Axe santé des populations et pratiques optimales en Santé, Centre de Recherche du CHU de Québec, Hôpital du Saint-Sacrement, 1050, chemin Sainte-Foy, Québec, QC G1S 4L8, Canada; Département de Médecine Sociale et Préventive, Université Laval, Pavillon Ferdinand-Vandry, Québec, QC G1V 0A6, Canada
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16
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Rühl M, Kühn B, Roos J, Maier TJ, Steinhilber D, Karas M. Elucidation of chemical modifier reactivity towards peptides and proteins and the analysis of specific fragmentation by matrix-assisted laser desorption/ionization collision-induced dissociation tandem mass spectrometry. Rapid Commun Mass Spectrom 2019; 33 Suppl 1:40-49. [PMID: 29964304 DOI: 10.1002/rcm.8223] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) analysis of covalent 5-lipoxygenase inhibitors is challenging due to unknown amino acid specificity and low posttranslational modification (PTM)-identification rates. The analysis of the amino-acid specificity and of the characteristic fragmentation of chemically modified peptides is considered to improve knowledge for the analysis of chemically modified peptides and proteins by MALDI-MS. METHODS Various compounds were used to investigate the modification of synthetic peptides carrying reactive amino acid residues. Mass spectra were recorded using a MALDI-LTQ Orbitrap XL for high-resolution mass spectrometry and ion trap MALDI-MS2 . UV-Vis-based reduction and radical scavenging analysis was conducted. The on-plate digestion method described by Rühl et al was utilized for modification-site analysis at 5-lipoxygenase. RESULTS The analysis of amino-acid-specific reactivity revealed the reactivity of quinones towards cysteine residues and the potential occurrence of a subsequent oxidative process was observed by an UV-Vis-based reduction assay. MALDI collision-induced dissociation tandem mass spectrometry (CID-MS2 ) indicated a prominent fragmentation mechanism of modified cysteine and histidine residues. Fragmentation included highly abundant neutral-loss signals which could be used to identify new modifications induced by chemical modifiers at the cysteine-159 residue of 5-lipoxygenase. CONCLUSIONS Specificity and fragmentation analysis provides crucial information for the analysis of chemically modified cysteines and histidines by MALDI-MS. Elucidation of binding sites by MALDI-MS has been significantly improved using an easy-to-run peptide assay and gives background information for the analysis in the case of chemically modified 5-lipoxygenase.
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Affiliation(s)
- Michael Rühl
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
| | - Benjamin Kühn
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
| | - Jessica Roos
- Clinic of Anesthesiology, Intensive Care Medicine and Pain Therapy, Goethe University Hospital, Theodor-Stern-Kai 7, 60590, Frankfurt/Main, Germany
| | - Thorsten J Maier
- Clinic of Anesthesiology, Intensive Care Medicine and Pain Therapy, Goethe University Hospital, Theodor-Stern-Kai 7, 60590, Frankfurt/Main, Germany
| | - Dieter Steinhilber
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
| | - Michael Karas
- Institute of Pharmaceutical Chemistry, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438, Frankfurt/Main, Germany
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Shen R, Zou L, Wu S, Li T, Wang J, Liu J, Ling L. A novel label-free fluorescent detection of histidine based upon Cu 2+-specific DNAzyme and hybridization chain reaction. Spectrochim Acta A Mol Biomol Spectrosc 2019; 213:42-47. [PMID: 30682646 DOI: 10.1016/j.saa.2019.01.062] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 01/16/2019] [Accepted: 01/16/2019] [Indexed: 06/09/2023]
Abstract
A novel label-free fluorescent sensor for histidine was developed based upon Cu2+-specific DNAzyme, hybridization chain reaction(HCR) and triplex DNA. Cu2+ can bind to the histidine, in the presence of histidine, leading to the inhibition of the cleavage of substrate strand of Cu2+-dependent DNAzyme, then the intact substrate strand trigger the HCR between H1 and H2. The HCR product can be recognized by triplex-forming oligonucleotide (TFO) through triplex formation and reported by the fluorescence of berberine, the fluorescence intensity of the sensing system was proportional to the concentration of histidine during the range of 5.7-455 nmol L-1, with a detection limit of 2.0 nmol L-1.
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Affiliation(s)
- Ruidi Shen
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Li Zou
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Shixin Wu
- Maternal and Child Care Service Centre of Yunxi County, Shiyan 442600, PR China
| | - Tingting Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Jing Wang
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Jianmin Liu
- Department of Neurosurgery, the First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou 510405, PR China
| | - Liansheng Ling
- School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China.
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18
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Lu W, Jiao Y, Gao Y, Qiao J, Mozneb M, Shuang S, Dong C, Li CZ. Bright Yellow Fluorescent Carbon Dots as a Multifunctional Sensing Platform for the Label-Free Detection of Fluoroquinolones and Histidine. ACS Appl Mater Interfaces 2018; 10:42915-42924. [PMID: 30412373 DOI: 10.1021/acsami.8b16710] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Owing to their diverse properties, fluorescent carbon dots (CDs) have attracted more attention and present enormous potential in development of sensors, bioimaging, drug delivery, microfluidics, photodynamic therapy, light emitting diode, and so forth. Herein, a multifunctional sensing platform based on bright yellow fluorescent CDs (Y-CDs) was designed for the label-free detection of fluoroquinolones (FQs) and histidine (His). The Y-CDs with superior optical and biological merits including high chemical stability, good biocompatibility, and low cytotoxicity were simply synthesized via one-step hydrothermal treatment of o-phenylenediamine ( o-PD) and 4-aminobutyric acid (GABA). The Y-CDs can be utilized to directly monitor the amount of FQs based on fluorescence static quenching owing to the specific interaction between FQs and Y-CDs. Then, the fluorescence of this system can be effectively recovered upon addition of His. The multifunctional sensing platform exhibited high sensitivity and selectivity toward three kinds of FQs and His with low detection limits of 17-67 and 35 nM, respectively. Benefiting from these outstanding characters, the Y-CDs were successfully employed for trace detection of FQs in real samples such as antibiotic tablets and milk products. Furthermore, the probe was also extended to cellular imaging. All of the above prove that this multifunctional sensing platform presents great prospect in multiple applications such as biosensing, biomedicine, disease diagnosis, and environmental monitoring.
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Affiliation(s)
- Wenjing Lu
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering , Shanxi University , Taiyuan 030006 , China
- Nanobioengineering/Bioelectronics Laboratory, and Department of Biomedical Engineering , Florida International University , Miami 33174 , United States
| | - Yuan Jiao
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering , Shanxi University , Taiyuan 030006 , China
| | - Yifang Gao
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering , Shanxi University , Taiyuan 030006 , China
| | - Jie Qiao
- Nanobioengineering/Bioelectronics Laboratory, and Department of Biomedical Engineering , Florida International University , Miami 33174 , United States
- School of Basic Medical Sciences , Shanxi Medical University , Taiyuan 030001 , China
| | - Maedeh Mozneb
- Nanobioengineering/Bioelectronics Laboratory, and Department of Biomedical Engineering , Florida International University , Miami 33174 , United States
| | - Shaomin Shuang
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering , Shanxi University , Taiyuan 030006 , China
| | - Chuan Dong
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering , Shanxi University , Taiyuan 030006 , China
| | - Chen-Zhong Li
- Nanobioengineering/Bioelectronics Laboratory, and Department of Biomedical Engineering , Florida International University , Miami 33174 , United States
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Huang X, Li K, Wang X, Xia P. Rational design of an "on-off-on" fluorescent switch for Cu 2+ and histidine based on chiral macrocyclic dioxopolyamine. Spectrochim Acta A Mol Biomol Spectrosc 2018; 205:287-291. [PMID: 30029191 DOI: 10.1016/j.saa.2018.07.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Revised: 07/12/2018] [Accepted: 07/13/2018] [Indexed: 06/08/2023]
Abstract
A novel chemosensor 1 having a chiral macrocyclic dioxopolyamine of C2 symmetry as a receptor and anthracene as a signal unit has been designed and synthesized for cations and α-amino acids recognition in DMSO-HEPES buffer (1:9, v/v, pH 7.2). The ligand exhibited selective response to Cu2+ even in the presence of other metal ions with a fluorescence "switch-off" behavior. Additionally, the in situ generated 1-Cu2+ ensemble displayed specific recognition to histidine by a "switch-on" fluorescence response. For this dual functional switch, its sensing behavior via a displacement mode was confirmed by 1H NMR titration and ESI mass spectroscopy. Sequential "on-off-on" fluorescence responses of 1 to Cu2+ and histidine are successfully applied in HeLa cells.
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Affiliation(s)
- Xiaohuan Huang
- Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China.
| | - Kaiqun Li
- Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China
| | - Xu Wang
- Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China
| | - Peng Xia
- Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China
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Zhang ST, Li P, Liao C, Luo T, Kou X, Xiao D. A highly sensitive luminescent probe based on Ru(II)-bipyridine complex for Cu 2+, l-Histidine detection and cellular imaging. Spectrochim Acta A Mol Biomol Spectrosc 2018; 201:161-169. [PMID: 29751349 DOI: 10.1016/j.saa.2018.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 04/29/2018] [Accepted: 05/01/2018] [Indexed: 06/08/2023]
Abstract
A ruthenium(II) bipyridyl complex conjugated with functionalized Schiff base (RuA) has been synthesized and functioned as a luminescent probe. The luminescence of RuA was greatly quenched by Cu2+ due to its molecular coordination with paramagnetic Cu2+. Subsequently, the addition of l-Histidine can turn on the luminescence of the RuA-Cu(II) ensemble, which can be attributed to the replacement of RuA in RuA-Cu(II) ensemble by l-Histidine. On the basis of the quenching and recovery of the luminescence of RuA, we proposed a rapid and highly sensitive on-off-on luminescent assay for sensing Cu2+ and l-Histidine in aqueous solution. Under the optimal conditions, Cu2+ and l-Histidine can be detected in the concentration range of 5 nM-9.0 μM and 50 nM-30 μM, respectively, and the corresponding detection limits were calculated to be 0.35 and 0.44 nM (S/N=3), separately. The proposed luminescent probe has been successfully utilized for the analysis of Cu2+ and l-Histidine in real samples (drinking water and biological fluids). Furthermore, the probe revealed good photostability, low cytotoxicity and excellent permeability, making it a suitable candidate for cell imaging and labeling in vitro.
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Affiliation(s)
- Shi-Ting Zhang
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Panpan Li
- Department of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Caiyun Liao
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Tingting Luo
- College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xingming Kou
- College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Dan Xiao
- College of Chemistry, Sichuan University, Chengdu 610064, China; College of Chemical Engineering, Sichuan University, Chengdu 610065, China.
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21
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Mano F, Ikeda K, Joo E, Yamane S, Harada N, Inagaki N. Effects of three major amino acids found in Japanese broth on glucose metabolism and gastric emptying. Nutrition 2018; 46:153-158.e1. [PMID: 29031770 DOI: 10.1016/j.nut.2017.08.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 07/18/2017] [Accepted: 08/06/2017] [Indexed: 11/21/2022]
Abstract
OBJECTIVES To our knowledge, the effect of the broth of dried kelp and dried bonito, dashi, on glucose metabolism and digestion has rarely been studied. Based on the component analysis of three actual broths served in traditional restaurants, a chemically synthesized broth with three free amino acids (histidine, glutamate, aspartate) and salt was prepared to investigate their effect on glucose metabolism, glucose-dependent insulinotropic polypeptide (GIP), and glucagon-like peptide 1 (GLP-1) secretion, and digestion. METHODS In study 1, seven healthy individuals were enrolled in a four-period crossover study. Participants drank or ate hot water, synthesized broth, hot water with rice, and synthesized broth with rice. Plasma glucose, serum insulin, plasma glucagon, plasma GIP, and plasma GLP-1 were measured at baseline and after ingestion. In study 2, 6 of the 7 individuals ingested rice steamed with 13C-labeled sodium acetate with hot water or synthesized broth to estimate gastric emptying by the 13C-labeled acetate breath test in a two-period crossover trial. RESULTS Ingesting water or synthesized broth alone elicited no change in plasma glucose or serum insulin levels. Ingesting synthesized broth with rice resulted in a rapid rise in plasma glucose and GLP-1 (P = 0.01 and 0.02, respectively) in an early postprandial phase compared with that by ingesting water with rice, but the area under the curve of those showed no significant differences. Ingesting synthesized broth with rice resulted in a significantly higher gastric emptying coefficient than that after rice with water (P = 0.03). CONCLUSIONS Three amino acids and sodium chloride corresponding to those found in actual broth promoted gastric emptying and led to a rapid response of plasma glucose. Our findings suggest that ingestion of the broth of dried kelp and dried bonito may improve gastric motility.
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Affiliation(s)
- Fumika Mano
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kaori Ikeda
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Erina Joo
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shunsuke Yamane
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Norio Harada
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Nobuya Inagaki
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
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22
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Kranz M, Viton F, Smarrito-Menozzi C, Hofmann T. Sensomics-Based Molecularization of the Taste of Pot-au-Feu, a Traditional Meat/Vegetable Broth. J Agric Food Chem 2018; 66:194-202. [PMID: 29200278 DOI: 10.1021/acs.jafc.7b05089] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Targeted quantification of 49 basic taste-active molecules, followed by the calculation of dose-over-threshold (DoT) factors, and taste re-engineering experiments revealed minerals, nucleotides/nucleosides, amino acids, organic acids, and carbohydrates as the key compounds of Pot-au-Feu, a traditional broth preparation from beef cuts and vegetables. Moreover, the dipeptide carnosine was identified to be the key inducer for the white-meaty and thick-sour orosensation of the broth, next to anserine and 1-deoxy-d-fructosyl-N-β-alanyl-l-histidine, the latter of which has been identified for the first time by means of a sensory-guided fractionation. Sensory studies revealed the threshold concentration of carnosine in model broth to decrease by a factor of 5 upon nonenzymatic glycosylation to reach 4.4 mmol/L for its Amadori product 1-deoxy-d-fructosyl-N-β-alanyl-l-histidine.
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Affiliation(s)
- Maximilian Kranz
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich , Lise-Meitner Strasse 34, D-85354 Freising, Germany
| | - Florian Viton
- Nestlé Research Center, Nestec Ltd. , Vers-chez-les-Blanc, 1000 Lausanne 26, Switzerland
| | | | - Thomas Hofmann
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich , Lise-Meitner Strasse 34, D-85354 Freising, Germany
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23
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Jonassen T, Hamadi M, Remø SC, Waagbø R. An epidemiological study of cataracts in wild and farmed lumpfish (Cyclopterus lumpus L.) and the relation to nutrition. J Fish Dis 2017; 40:1903-1914. [PMID: 28661002 DOI: 10.1111/jfd.12664] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 06/07/2023]
Abstract
Twelve groups of farmed lumpfish and one of wild lumpfish were screened for cataract and sampled for fish muscle tissue, whole heart and both eye lenses to investigate possible relations between cataract and tissue free amino acid concentrations. Cataract prevalence ranged from 20% to 100%, with the highest average score of 7.3 (max 8) and incidences of severe cataract (>5) in all groups. Cataract could not be explained by suboptimal histidine concentrations in the feed. Neither muscle nor cardiac tissues had concentrations of free histidine compounds. The lumpfish lens contained N-acetylhistidine (NAH), of which low concentrations were strongly related to cataract severity. However, no correlation between lens NAH and cataract severity was found in the present sample set. Wild lumpfish had higher levels compared to farmed lumpfish, suggesting that the farmed lumpfish may have been deficient in histidine or have a higher utilization of NAH due to osmotic problems. Thus, cataract in farmed lumpfish may be related to primary or secondary disturbed nutrient metabolism or malnutrition, shown by the high levels of specific amino acids in different tissues, which may cause osmotic imbalance and cataract development. This nutritional or environmental-related welfare problem deserves further research.
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Affiliation(s)
- T Jonassen
- Akvaplan-niva, Framsenteret, Tromsø, Norway
| | - M Hamadi
- Aqua Kompetanse, Flatanger, Norway
| | - S C Remø
- NIFES (The National Institute of Nutrition and Seafood Research), Bergen, Norway
| | - R Waagbø
- NIFES (The National Institute of Nutrition and Seafood Research), Bergen, Norway
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Dajnowicz S, Seaver S, Hanson BL, Fisher SZ, Langan P, Kovalevsky AY, Mueser TC. Visualizing the Bohr effect in hemoglobin: neutron structure of equine cyanomethemoglobin in the R state and comparison with human deoxyhemoglobin in the T state. Acta Crystallogr D Struct Biol 2016; 72:892-903. [PMID: 27377386 PMCID: PMC4932920 DOI: 10.1107/s2059798316009049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 06/03/2016] [Indexed: 11/17/2022] Open
Abstract
Neutron crystallography provides direct visual evidence of the atomic positions of deuterium-exchanged H atoms, enabling the accurate determination of the protonation/deuteration state of hydrated biomolecules. Comparison of two neutron structures of hemoglobins, human deoxyhemoglobin (T state) and equine cyanomethemoglobin (R state), offers a direct observation of histidine residues that are likely to contribute to the Bohr effect. Previous studies have shown that the T-state N-terminal and C-terminal salt bridges appear to have a partial instead of a primary overall contribution. Four conserved histidine residues [αHis72(EF1), αHis103(G10), αHis89(FG1), αHis112(G19) and βHis97(FG4)] can become protonated/deuterated from the R to the T state, while two histidine residues [αHis20(B1) and βHis117(G19)] can lose a proton/deuteron. αHis103(G10), located in the α1:β1 dimer interface, appears to be a Bohr group that undergoes structural changes: in the R state it is singly protonated/deuterated and hydrogen-bonded through a water network to βAsn108(G10) and in the T state it is doubly protonated/deuterated with the network uncoupled. The very long-term H/D exchange of the amide protons identifies regions that are accessible to exchange as well as regions that are impermeable to exchange. The liganded relaxed state (R state) has comparable levels of exchange (17.1% non-exchanged) compared with the deoxy tense state (T state; 11.8% non-exchanged). Interestingly, the regions of non-exchanged protons shift from the tetramer interfaces in the T-state interface (α1:β2 and α2:β1) to the cores of the individual monomers and to the dimer interfaces (α1:β1 and α2:β2) in the R state. The comparison of regions of stability in the two states allows a visualization of the conservation of fold energy necessary for ligand binding and release.
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Affiliation(s)
- Steven Dajnowicz
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
| | - Sean Seaver
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
| | - B. Leif Hanson
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
| | - S. Zoë Fisher
- Scientific Activities Division, Science Directorate, European Spallation Source, PO Box 176, 221 00 Lund, Sweden
| | - Paul Langan
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Andrey Y. Kovalevsky
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
| | - Timothy C. Mueser
- Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio, USA
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Zhu X, Zhao T, Nie Z, Miao Z, Liu Y, Yao S. Nitrogen-doped carbon nanoparticle modulated turn-on fluorescent probes for histidine detection and its imaging in living cells. Nanoscale 2016; 8:2205-2211. [PMID: 26730681 DOI: 10.1039/c5nr07826a] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, nitrogen-doped carbon nanoparticle (N-CNP) modulated turn-on fluorescent probes were developed for rapid and selective detection of histidine. The as synthesized N-CNPs exhibited high fluorescence quantum yield and excellent biocompatibility. The fluorescence of N-CNPs can be quenched selectively by Cu(II) ions with high efficiency, and restored by the addition of histidine owing to the competitive binding of Cu(II) ions and histidine that removes Cu(II) ions from the surface of the N-CNPs. Under the optimal conditions, a linear relationship between the increased fluorescence intensity of N-CNP/Cu(II) ion conjugates and the concentration of histidine was established in the range from 0.5 to 60 μM. The detection limit was as low as 150 nM (signal-to-noise ratio of 3). In addition, the as-prepared N-CNP/Cu(II) ion nanoprobes showed excellent biocompatibility and were applied for a histidine imaging assay in living cells, which presented great potential in the bio-labeling assay and clinical diagnostic applications.
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Affiliation(s)
- Xiaohua Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China. and Department of Chemistry, Beijing Key Laboratory for Analytical Methods and Instrumentation, Key Lab of Bioorganic Phosphorus Chemistry and Chemical Biology of Ministry of Education, Tsinghua University, Beijing 100084, China.
| | - Tingbi Zhao
- Department of Chemistry, Beijing Key Laboratory for Analytical Methods and Instrumentation, Key Lab of Bioorganic Phosphorus Chemistry and Chemical Biology of Ministry of Education, Tsinghua University, Beijing 100084, China.
| | - Zhou Nie
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
| | - Zhuang Miao
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin 130033, China
| | - Yang Liu
- Department of Chemistry, Beijing Key Laboratory for Analytical Methods and Instrumentation, Key Lab of Bioorganic Phosphorus Chemistry and Chemical Biology of Ministry of Education, Tsinghua University, Beijing 100084, China.
| | - Shouzhuo Yao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
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26
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Horii I, Kawasaki K, Koyama J, Nakayama Y, Nakajima K, Okazaki K, Seiji M. Histidine-rich protein as a possible origin of free amino acids of stratum corneum. Curr Probl Dermatol 2015; 11:301-15. [PMID: 6653157 DOI: 10.1159/000408684] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The origin of free amino acids and/or their metabolites of the stratum corneum was investigated by pulse-chase experiments using hairless mice. Two, 24, 48, and 72 hrs after the animals were pulse-chased with 3H-histidine or 3H-arginine, radioactivity was determined in the following three fractions of the epidermis: the 0.1 N HClO4 soluble, ethanol soluble fraction (Fr. I); the 0.1N NClO4 soluble, ethanol insoluble fraction (Fr. II); and the 0.1 N HClO4 insoluble, 8M urea soluble fraction (Fr. III). Radioactivity of the epidermal proteins was also determined in SDS-PAGE gels by the gel slicing method. At first, 3H-histidine and/or 3H-arginine were predominantly incorporated into Fr. III, especially into a certain epidermal protein which showed little mobility on SDS-PAGE. Subsequently, 3H, once incorporated into Fr. III, appeared to shift from Fr. III to Fr. II and, simultaneously, from the top band(s) to a band of 32,000 daltons. As a result of amino acid analysis, a protein of Fr. II was considered a histidine-rich protein corresponding to HRP-II of the new born rats of Ball et al. After 48 hrs, as the radioactivities of Fr. III and Fr. II decreased remarkably, Fr. I gradually increased in radioactivity. The major radioactive substances in Fr. I at 72 hrs were identified as 3H-histidine and 3H-urocanic acid when 3H-histidine was used as a tracer, and as 3H-arginine, 3H-ornithine, and 3H-citrulline in the case of 3H-arginine. The amino acid composition of the histidine-rich protein was very similar to that of the free amino acids of the stratum corneum in the hairless mouse, in which some amino acid metabolites were considered as their precursor amino acids. These results strongly suggest that the free amino acids and/or their metabolites of the stratum corneum might be the final products of a degradation of the histidine-rich protein.
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Abstract
Recent findings unexpectedly revealed that human TLR4 can be directly activated by nickel ions. This activation is due to the coordination of nickel by a cluster of histidine residues on the ectodomain of human TLR4, which is absent in most other species. We aimed to elucidate the role of MD-2 in the molecular mechanism of TLR4/MD-2 activation by nickel, as nickel binding site on TLR4 is remote from MD-2, which directly binds the endotoxin as the main pathological activator of TLR4. We identified MD-2 and TLR4 mutants which abolished TLR4/MD-2 receptor activation by endotoxin but could nevertheless be significantly activated by nickel, which acts in synergy with LPS. Human TLR4/MD-2 was also activated by cobalt ions, while copper and cadmium were toxic in the tested concentration range. Activation of TLR4 by cobalt required MD-2 and was abolished by human TLR4 mutations of histidine residues at positions 456 and 458. We demonstrated that activation of TLR4 by nickel and cobalt ions can trigger both the MyD88-dependent and the -independent pathway. Based on our results we propose that predominantly hydrophobic interactions between MD-2 and TLR4 contribute to the stabilization of the TLR4/MD-2/metal ion complex in a conformation that enables activation.
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Affiliation(s)
- Alja Oblak
- Department of Biotechnology, National institute of Chemistry, Ljubljana, Slovenia
- Centre of Excellence EN-FIST, Ljubljana, Slovenia
| | - Jelka Pohar
- Department of Biotechnology, National institute of Chemistry, Ljubljana, Slovenia
- Centre of Excellence EN-FIST, Ljubljana, Slovenia
| | - Roman Jerala
- Department of Biotechnology, National institute of Chemistry, Ljubljana, Slovenia
- Centre of Excellence EN-FIST, Ljubljana, Slovenia
- * E-mail:
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28
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Torres-Fuentes C, Alaiz M, Vioque J. Chickpea chelating peptides inhibit copper-mediated lipid peroxidation. J Sci Food Agric 2014; 94:3181-3188. [PMID: 24652747 DOI: 10.1002/jsfa.6668] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 03/07/2014] [Accepted: 03/15/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND Transition metals produce radical oxygen species promoting lipid peroxidation processes that favor the development of cardiovascular and neurodegenerative diseases. In addition, the oxidation of lipids present in food may affect the quality of food products. Therefore antioxidants counteracting these metal pro-oxidant effects may have high potential for the pharmacology and food industries. This study investigated the capability of peptide fractions purified from chickpea protein hydrolysate to inhibit copper-mediated lipid peroxidation in three different lipid substrates: β-carotene, unsaturated fatty acid mixture and low-density lipoprotein. RESULTS Peptide fractions with the highest histidine content were the most antioxidant. This antioxidant effect is mainly due to the capability of histidine to bind copper and act as a hydrogen donor through its imidazole ring. CONCLUSION The results suggest that chickpea proteins are a potential source of antioxidant peptides that may be included as ingredients in functional foods with beneficial health effects. In addition, these antioxidant peptides may be useful to protect food products from lipid peroxidation processes and thus increase their quality and shelf life.
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Oslund RC, Kee JM, Couvillon AD, Bhatia V, Perlman DH, Muir TW. A phosphohistidine proteomics strategy based on elucidation of a unique gas-phase phosphopeptide fragmentation mechanism. J Am Chem Soc 2014; 136:12899-911. [PMID: 25156620 PMCID: PMC4183637 DOI: 10.1021/ja507614f] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Indexed: 01/25/2023]
Abstract
Protein histidine phosphorylation is increasingly recognized as a critical posttranslational modification (PTM) in central metabolism and cell signaling. Still, the detection of phosphohistidine (pHis) in the proteome has remained difficult due to the scarcity of tools to enrich and identify this labile PTM. To address this, we report the first global proteomic analysis of pHis proteins, combining selective immunoenrichment of pHis peptides and a bioinformatic strategy based on mechanistic insight into pHis peptide gas-phase fragmentation during LC-MS/MS. We show that collision-induced dissociation (CID) of pHis peptides produces prominent characteristic neutral losses of 98, 80, and 116 Da. Using isotopic labeling studies, we also demonstrate that the 98 Da neutral loss occurs via gas-phase phosphoryl transfer from pHis to the peptide C-terminal α-carboxylate or to Glu/Asp side chain residues if present. To exploit this property, we developed a software tool that screens LC-MS/MS spectra for potential matches to pHis-containing peptides based on their neutral loss pattern. This tool was integrated into a proteomics workflow for the identification of endogenous pHis-containing proteins in cellular lysates. As an illustration of this strategy, we analyzed pHis peptides from glycerol-fed and mannitol-fed Escherichia coli cells. We identified known and a number of previously speculative pHis sites inferred by homology, predominantly in the phosphoenolpyruvate:sugar transferase system (PTS). Furthermore, we identified two new sites of histidine phosphorylation on aldehyde-alcohol dehydrogenase (AdhE) and pyruvate kinase (PykF) enzymes, previously not known to bear this modification. This study lays the groundwork for future pHis proteomics studies in bacteria and other organisms.
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Affiliation(s)
- Rob C. Oslund
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Jung-Min Kee
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | | | - Vivek
N. Bhatia
- Heartflow,
Inc., 1400 Seaport Boulevard,
Building B, Redwood City, California 94063, United States
| | - David H. Perlman
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
- Department
of Molecular Biology, Princeton University, Princeton, New Jersey 08544, United States
- Lewis-Sigler
Institute for Integrative Genomics and the Princeton Collaborative
Proteomics Mass Spectrometry Center, Princeton
University, Princeton, New Jersey 08544, United States
| | - Tom W. Muir
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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Subramanian P, Mazurenko I, Zaitsev V, Coffinier Y, Boukherroub R, Szunerits S. Diamond nanowires modified with poly[3-(pyrrolyl)carboxylic acid] for the immobilization of histidine-tagged peptides. Analyst 2014; 139:4343-9. [PMID: 25009833 DOI: 10.1039/c4an00146j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Coating boron-doped diamond nanowires (BDD NWs) with a conducting polymer, poly[3-(pyrrolyl)carboxylic acid], has been reported. Polymer coating was achieved through electropolymerization of 3-(pyrrolyl)carboxylic acid at the electrode interface by amperometrically biasing the BDD NWs interface until a predefined charge has passed. The poly[3-(pyrrolyl)carboxylic acid] modified BDD NWs (PPA-BDD NWs) were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Using a deposition charge of 11 mC cm(-2) resulted in a thin polymer film deposition. The availability of the carboxylic groups of the polymer coated BDD NWs electrode was demonstrated through copper ion (Cu(2+)) chelation. The resulting complex was successfully used for the site-specific immobilization of histidine-tagged peptides. The binding process was followed by electrochemical impedance spectroscopy (EIS). The Cu(2+)-chelated PPA-BDD NWs interface showed peptide loading capability comparable to those of commercially available interfaces and can be easily regenerated several times using ethylenediaminetetraacetic acid (EDTA).
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Affiliation(s)
- Palaniappan Subramanian
- Institut de Recherche Interdisciplinaire (IRI), CNRS USR 3078, Université Lille1, Parc de la Haute Borne, 50 avenue de Halley, BP 70478, 59658 Villeneuve d'Ascq, France.
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31
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Ye YQ, Malon M, Martineau C, Taulelle F, Nishiyama Y. Rapid measurement of multidimensional 1H solid-state NMR spectra at ultra-fast MAS frequencies. J Magn Reson 2014; 239:75-80. [PMID: 24424008 DOI: 10.1016/j.jmr.2013.12.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 12/07/2013] [Accepted: 12/19/2013] [Indexed: 06/03/2023]
Abstract
A novel method to realize rapid repetition of (1)H NMR experiments at ultra-fast MAS frequencies is demonstrated. The ultra-fast MAS at 110kHz slows the (1)H-(1)H spin diffusion, leading to variations of (1)H T1 relaxation times from atom to atom within a molecule. The different relaxation behavior is averaged by applying (1)H-(1)H recoupling during relaxation delay even at ultra-fast MAS, reducing the optimal relaxation delay to maximize the signal to noise ratio. The way to determine optimal relaxation delay for arbitrary relaxation curve is shown. The reduction of optimal relaxation delay by radio-frequency driven recoupling (RFDR) was demonstrated on powder samples of glycine and ethenzamide with one and multi-dimensional NMR measurements.
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Affiliation(s)
- Yue Qi Ye
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Michal Malon
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Charlotte Martineau
- Tectospin, Institut Lavoisier de Versailles, Université de Versailles, Saint-Quentin-en-Yvelines, 78035 Versailles Cedex, France
| | - Francis Taulelle
- Tectospin, Institut Lavoisier de Versailles, Université de Versailles, Saint-Quentin-en-Yvelines, 78035 Versailles Cedex, France
| | - Yusuke Nishiyama
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
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López-Rituerto E, Avenoza A, Busto JH, Peregrina JM. NMR study of histidine metabolism during alcoholic and malolactic fermentations of wine and their influence on histamine production. J Agric Food Chem 2013; 61:9464-9469. [PMID: 24053312 DOI: 10.1021/jf402489g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The metabolic pathways of amino acids play a crucial role in the organoleptic and hygienic quality in wines. In particular, histidine is one of the most studied amino acids of wines due to histamine toxicity in humans, a biogenic amine derived from histidine by enzymatic decarboxylation. The development of new tools to increase knowledge on metabolism that produces histamine in wine is critical. This study investigated by using nuclear magnetic resonance (NMR) spectroscopy the transformation of histidine into histaminol and histamine during alcoholic and malolactic fermentations. The transformations of histidine into histaminol during alcoholic fermentation and into histamine during malolactic fermentation were observed. This paper highlights the importance of selecting lactic acid bacteria for malolactic fermentation to avoid the production of biogenic amines such as histamine.
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Affiliation(s)
- Eva López-Rituerto
- Departamento de Quı́mica, Centro de Investigación en Sı́ntesis Quı́mica (CISQ), Universidad de La Rioja , E-26006 Logroño, Spain
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Kugimiya A, Fukada R, Funamoto D. A luminol chemiluminescence method for sensing histidine and lysine using enzyme reactions. Anal Biochem 2013; 443:22-6. [PMID: 23973428 DOI: 10.1016/j.ab.2013.08.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 08/08/2013] [Accepted: 08/13/2013] [Indexed: 11/19/2022]
Abstract
The analysis of free amino acids in urine and plasma is useful for estimating disease status in clinical diagnoses. Changes in the concentration of free amino acids in foods are also useful markers of freshness, nutrition, and taste. In this study, the specific interaction between aminoacyl-tRNA synthetase (aaRS) and its corresponding amino acid was used to measure amino acid concentrations. Pyrophosphate released by the amino acid-aaRS binding reaction was detected by luminol chemiluminescence; the method provided selective quantitation of 1.0-30 μM histidine and 1.0-60 μM lysine.
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Affiliation(s)
- Akimitsu Kugimiya
- Center for Industry and Public Relations, Hiroshima City University, Naka-ku, Hiroshima 730-0052, Japan.
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Chen Z, Guo J, Li J, Guo L. An electrochemical aptasensor based on the amplification of two kinds of gold nanocrystals for the assay of L-histidine with picomolar detection limit. Nanotechnology 2013; 24:295501. [PMID: 23799661 DOI: 10.1088/0957-4484/24/29/295501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Au nanocrystals (NCs) enclosed by higher-index facets have high surface chemical activity. They attract much attention because of their excellent biocompatibility. In this work, well-defined elongated tetrahexahedral (ETHH) Au NCs and end-truncated ETHH with high-index facets are successfully prepared by using a single surfactant system of didodecyldimethylammonium bromide (DDAB) and a binary system of cetyltrimethylammoniumbromide and DDAB in two-step seed-mediated growth. The characteristics of high-index facet Au NC modified electronic aptamer-based sensors are presented and they are applicable to a wide range of aptamers. Herein, we only take L-histidine as the representative sensing target. With modification of the Au NCs, a very low detection limit (sub-picomolar) is obtained. In particular, a detailed sensitivity comparison between the modification of end-truncated ETHH and ETHH Au NCs is presented to demonstrate the slight difference in the chemical activities of Au NCs with different high-index facets. Our work sheds light on the large scale fabrication of Au/metallic NCs with high-index facets and also provides a new eye-opening example of engineering ultra-sensitive DNA sensors based on Au NCs.
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Affiliation(s)
- Zhengbo Chen
- Department of Chemistry, Capital Normal University, 105 West 3rd Ring Road North, Beijing 100048, People's Republic of China.
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35
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Domingos RF, Franco C, Pinheiro JP. Stability of core/shell quantum dots--role of pH and small organic ligands. Environ Sci Pollut Res Int 2013; 20:4872-4880. [PMID: 23307080 DOI: 10.1007/s11356-012-1457-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 12/27/2012] [Indexed: 06/01/2023]
Abstract
The improvement of knowledge about the toxicity and even processability, and stability of quantum dots (QD) requires the understanding of the relationship between the QD binding head group, surface structure, and interligand interaction. The scanned stripping chronopotentiometry and absence of gradients and Nernstian equilibrium stripping techniques were used to determine the concentration of Cd dissolved from a polyacrylate-stabilized CdTe/CdS QD. The effects of various concentrations of small organic ligands such as citric acid, glycine, and histidine and the roles of pH (4.5-8.5) and exposure time (0-48 h) were evaluated. The highest QD dissolution was obtained at the more acidic pH in absence of the ligands (52%) a result of the CdS shell solubility. At pH 8.5 the largest PAA ability to complex the dissolved Cd leads to a further QD solubility until the equilibrium is reached (24% of dissolved Cd vs. 4% at pH 6.0). The citric acid presence resulted in greater QD dissolution, whereas glycine, an amino acid, acts against QD dissolution. Surprisingly, the presence of histidine, an amino acid with an imidazole functional group, leads to the formation of much strong Cd complexes over time, which may be non-labile, inducing variations in the local environment of the QD surface.
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Affiliation(s)
- Rute F Domingos
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade Técnica de Lisboa, Torre Sul lab 11-6.3, Av. Rovisco Pais # 1, 1049-001 Lisbon, Portugal.
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Gloaguen M, Le Floc'h N, Primot Y, Corrent E, van Milgen J. Response of piglets to the standardized ileal digestible isoleucine, histidine and leucine supply in cereal-soybean meal-based diets. Animal 2013; 7:901-8. [PMID: 23228192 DOI: 10.1017/s1751731112002339] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Improving the amino acid (AA) profile of the diet by using l-Lys, l-Thr, dl-Met, l-Trp and l-Val helps to reduce the dietary CP content, thereby reducing nitrogen excretion while maintaining the performance of pigs. Valine is the fifth limiting AA in cereal-soybean meal-based diets. The extent to which the CP content in the diet can be reduced further without compromising performance depends on the requirement of the next limiting AA. In cereal-soybean meal-based diets, Ile, His and Leu may be the limiting AAs after Val, although information on the requirements for these AAs is scarce. Six experiments were conducted to determine the effect of supplementing a low-CP diet with l-Ile, l-His and l-Leu on the performance of pigs weighing 10 to 20 kg. Experiment 1 was designed to determine the most limiting AA with respect to performance among Ile, His and Leu. A diet 10% deficient in Ile, Leu and His relative to the National Research Council (NRC, 1998) requirement estimates tended to decrease daily feed intake and daily gain by 6% and 8%, respectively. A 10% deficiency in His alone had no effect, whereas a 10% deficiency in Ile or Leu slightly reduced daily feed intake and gain. In the remaining experiments, the standardized ileal digestible (SID) Ile : Lys, His : Lys and Leu : Lys requirements were estimated. In Experiments 2, 3, 4, 5 and 6, 14 blocks of six pigs each were assigned to six levels of SID Ile : Lys (40%, 43%, 46%, 49%, 52% and 55%), His : Lys (20%, 24%, 28%, 32%, 36% and 40%), His : Lys (21%, 24%, 27%, 30%, 33% and 36%), Leu : Lys (70%, 78%, 86%, 94%, 102% and 110%) and Leu : Lys (80%, 90%, 100%, 110%, 120% and 130%), respectively. Across experiments, the estimated SID Ile : Lys, His : Lys and Leu : Lys requirements for maximizing daily gain were 49%, 32% and 102%, respectively, using a curvilinear plateau model. When Ile, His and Leu levels were 10% below the requirement estimate, daily gain was reduced by 9%, 3% and 3%, respectively. The results of this study indicate that the Ile requirement estimate is lower than the current NRC requirement estimate, whereas the Leu and His requirements correspond to those proposed by the NRC.
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Affiliation(s)
- M Gloaguen
- INRA, UMR1348 PEGASE, F-35590 Saint-Gilles, France
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Thureau P, Mollica G, Ziarelli F, Viel S. Selective measurements of long-range homonuclear J-couplings in solid-state NMR. J Magn Reson 2013; 231:90-94. [PMID: 23608042 DOI: 10.1016/j.jmr.2013.03.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 03/17/2013] [Accepted: 03/23/2013] [Indexed: 06/02/2023]
Abstract
We demonstrate here that the principle of frequency-selective spin-echoes can be extended to the measurements of long-range homonuclear scalar J-couplings in the solid-state. Singly or doubly frequency-selective pulses were used to generate either a J-modulated experiment (S) or a reference experiment (S0). The combination of these two distinct experiments provides experimental data that, in favorable cases, are insensitive to incoherent relaxation effects, and which can be used to estimate long-range homonuclear J-couplings in multiple spin-systems. The concept is illustrated in the case of a uniformly (13)C and (15)N labeled sample of L-histidine, where the absolute value of homonuclear J-couplings between two spins separated by one, two or three covalent bonds are measured. Moreover, we show that a (2)J((15)N-C-(15)N) coupling as small as 0.9 Hz can be precisely measured with the method presented here.
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Affiliation(s)
- Pierre Thureau
- Aix-Marseille Univ., CNRS, UMR 7273: Institut de Chimie Radicalaire, 13397 Marseille, France.
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Dalsgaard TK, Triquigneaux M, Deterding L, Summers F, Ranguelova K, Mortensen G, Mason RP. Site-specific detection of radicals on α-lactalbumin after a riboflavin-sensitized reaction, detected by immuno-spin trapping, ESR, and MS. J Agric Food Chem 2013; 61:418-426. [PMID: 23249215 DOI: 10.1021/jf303973b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Free radicals and other oxidation products were characterized on α-lactalbumin with electron spin resonance (ESR), immuno-spin trapping, and mass spectrometry (MS) after riboflavin-mediated oxidation. Radicals were detected using the spin trap 5,5-dimethyl-1-pyrroline N-oxide (DMPO) in immuno-spin trapping with both enzyme-linked immunosorbent assay (ELISA) and Western blotting and further characterized with mass spectrometry. A DMPO-trapped radical was identified at His68 and another at one of the tyrosine residues, Tyr50 or Tyr36, respectively, generated by a type II or I mechanism. Not all tyrosyl radicals were trapped, as the secondary oxidation product, 3,4-dihydroxyphenylalanine (DOPA), was detected by mass spectrometry at Tyr18 and Tyr50. A further oxidation of DOPA resulted in the DOPA o-semiquinone radical, which was characterized by ESR. Both surface exposure and the neighboring residues in the local environment of the tertiary structure of α-lactalbumin seem to play a role in the generation of DMPO trapped radicals and secondary oxidation products.
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Affiliation(s)
- Trine K Dalsgaard
- Department of Food Science, Faculty of Science and Technology, Aarhus University, P.O. Box 50, DK-8830 Tjele, Denmark.
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Mobarraz M, Ganjali MR, Chaichi MJ, Norouzi P. Functionalized ZnS quantum dots as luminescent probes for detection of amino acids. Spectrochim Acta A Mol Biomol Spectrosc 2012; 96:801-804. [PMID: 22925905 DOI: 10.1016/j.saa.2012.07.088] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 06/25/2012] [Accepted: 07/05/2012] [Indexed: 06/01/2023]
Abstract
In this work, L-cysteine capped-ZnS quantum dots were synthesized in aqueous medium, and their interaction with some of the amino acids was studied with fluorescence spectra. The results demonstrated that histidine could effectively quench the Quantum dots emission more than other amino acids. Electron transfer process between the capping ligands and histidine was mainly responsible for the remarkable quenching effect of histidine, because according to the structure of histidine, it is the strongest acceptor among essential amino acids. Under optimum conditions, the quenched fluorescence intensity increased linearly with the concentration of histidine ranging from 1.33×10(-6) to 1.49×10(-4) mol L(-1). The limit of detection for histidine was 0.05×10(-7) mol L(-1).
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Affiliation(s)
- Mahsa Mobarraz
- Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran.
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Swartz JD, Gulka CP, Haselton FR, Wright DW. Development of a histidine-targeted spectrophotometric sensor using Ni(II)NTA-functionalized Au and Ag nanoparticles. Langmuir 2011; 27:15330-15339. [PMID: 22026818 DOI: 10.1021/la202937j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An antibody-free diagnostic reagent has been developed based on the aggregation-induced colorimetric change of Ni(II)NTA-functionalized colloidal gold and silver nanoparticles. This diagnostic strategy utilizes the high binding affinity of histidine-rich proteins with Ni(II)NTA to capture and cross-link the histidine-rich protein mimics with the silver and gold nanoparticles. In model studies, the aggregation behavior of the Ni(II)NTA nanoparticles was tested against synthetic targets including charged poly(amino acid)s (histidine, lysine, arginine, and aspartic acid) and mimics of Plasmodium falciparum histidine-rich protein 2 (pfHRP-II). Aggregation of the nanoparticle sensor was induced by all of the basic poly(amino acid)s including poly(l-histidine) within the pH range (5.5-9.0) tested, which is likely caused by the coordination between the multivalent polymer target and Ni(II)NTA groups on multiple particles. The peptide mimics induced aggregation of the nanoparticles only near their pK(a)'s with higher limits of detection. In addition, monomeric amino acids do not show any aggregation behavior, suggesting that multiple target binding sites are necessary for aggregation. Long-term stability studies showed that gold but not silver nanoparticles remained stable and exhibited similar aggregation behavior after 1 month of storage at room temperature and 37 °C. These results suggest that Ni(II)NTA gold nanoparticles could be further investigated for use as a sensor to detect histidine-rich proteins in biological samples.
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Affiliation(s)
- Joshua D Swartz
- Department of Chemistry, Vanderbilt University, Station B 351822, Nashville, Tennessee 37235-1822, USA
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Grosvenor AJ, Morton JD, Dyer JM. Proteomic characterisation of hydrothermal redox damage. J Sci Food Agric 2011; 91:2806-2813. [PMID: 21769879 DOI: 10.1002/jsfa.4525] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 05/23/2011] [Accepted: 05/24/2011] [Indexed: 05/31/2023]
Abstract
BACKGROUND Peptide and protein damage contributes to the loss of quality and value in protein-based food and textile products as well as to the degeneration of biological tissues such as hair and skin. The effects of elevated temperature on such substrates at the molecular level are, however, relatively unknown. This paper examines the response of peptides and proteins to hydrothermal damage using mass spectrometry and reports the location of molecular markers of hydrothermal damage within wool proteins. RESULTS The hydrothermal exposure of model peptides containing the oxidatively sensitive residues tryptophan and tyrosine revealed the formation of a number of products such as hydroxytryptophan and dihydrophenylalanine. A variety of degradation products were also observed in intermediate filament proteins, including products arising from deamidation and from oxidation of histidine, tyrosine and tryptophan residues. CONCLUSION The products observed to form during hydrothermal exposure indicated the involvement of reactive oxygen species. Molecular markers were identified within a proteinaceous system to allow the evaluation of damage type or severity. These findings have important implications for the thermal processing of foods and textiles.
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Affiliation(s)
- Anita J Grosvenor
- Protein Quality & Function, Lincoln Research Centre, AgResearch, Lincoln, New Zealand
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42
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Verwer PEB, Woodle MC, Boekhout T, Hagen F, Bakker-Woudenberg IAJM, van de Sande WWJ. Cryptococcus and Trichosporon spp. are susceptible in vitro to branched histidine- and lysine-rich peptides (BHKPs). J Antimicrob Chemother 2011; 66:1649-52. [PMID: 21543360 DOI: 10.1093/jac/dkr175] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Tanaka S, Machino M, Akita S, Yokote Y, Sakagami H. Changes in salivary amino acid composition during aging. In Vivo 2010; 24:853-856. [PMID: 21164043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND it has been suggested that the features of saliva reflect the physiological and psychological state of primates as well as subprimates, however, studies revealing the relationship between aging and the concentrations of salivary amino acids are limited. In order to better understand their physiological role, age-related changes of salivary amino acids were investigated. MATERIALS AND METHODS forty-five participants including 5 children [6.60 ± 1.67 (5-9) years old], 20 adults [46.55 ± 14.68 (23-64) years old), and 20 senior citizens [71.60 ± 4.27 (66-82) years old] took part in this study. Whole saliva (one sample per each person) was collected in the daytime (10:00-11:00 or 14:00-15:00). Salivary amino acids were recovered after deproteinization with 5% trichloroacetic acid and determined by an amino acid analyzer. RESULTS glycine was the most abundant amino acid in the saliva. Glycine and lysine levels increased significantly (p<0.05) with aging, regardless of gender difference. When the glycine and lysine levels were plotted, much higher correlation (p<0.001) was observed. On the other hand, there was no significant correlation between the salivary concentration of glutamic acid or histidine and age. CONCLUSION salivary amino acid levels may be regarded as markers of aging.
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Affiliation(s)
- Shoji Tanaka
- Division of Oral Diagnosis, Department of Diagnosis and Therapeutic Sciences, Meikai University School of Dentistry, Sakado, Saitama 350-0283, Japan.
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Paul S, Kurur ND, Madhu PK. On the choice of heteronuclear dipolar decoupling scheme in solid-state NMR. J Magn Reson 2010; 207:140-148. [PMID: 20870436 DOI: 10.1016/j.jmr.2010.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Accepted: 08/31/2010] [Indexed: 05/28/2023]
Abstract
We present here a comparison of different heteronuclear dipolar decoupling sequences at the moderate magic-angle spinning (MAS) frequency (ν(r)) of 30 kHz. The radio-frequency (RF) amplitude (ν₁) ranges from the low power (ν₁<ν(r)) to the high power regime (ν₁>2ν(r)) and includes the rotary resonance conditions (ν₁=nν(r)) where n=1, 2. For decoupling at the rotary resonance condition, we recently introduced a modification of TPPM, namely high-phase TPPM, whose properties will be discussed here. Finally, based on earlier published and current experimental results we suggest the optimal sequence for heteronuclear dipolar decoupling at any RF amplitude and MAS frequencies up to 35 kHz.
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Affiliation(s)
- Subhradip Paul
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
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Kohler M, Thomas A, Walpurgis K, Terlouw K, Schänzer W, Thevis M. Detection of His-tagged Long-R³-IGF-I in a black market product. Growth Horm IGF Res 2010; 20:386-390. [PMID: 20675162 DOI: 10.1016/j.ghir.2010.07.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 06/28/2010] [Accepted: 07/10/2010] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Performance-enhancing substances are illicitly used in elite or amateur sports and may be obtained from the black market due to a cheaper and easier availability. Although various studies have shown that black market products frequently do not contain the declared substances, enormous amounts of illegally produced and/or imported drugs are confiscated from athletes or at customs with alarming results concerning the outcome of the analyses of the ingredients. This case report describes the identification of His-tagged Long-R³-IGF-I, which is usually produced for biochemical studies, in an injection vial. DESIGN The ingredients were isolated by immunoaffinity purification and identified by nano-UPLC, high-resolution/high accuracy mass spectrometry of the intact and trypsinated substance and by an enzyme-linked immunosorbent assay. RESULTS (Tandem) mass spectra characterized the protein as Long-R³-IGF-I with a His₆-tag attached to the C-terminus by the linker amino acids Leu-Glu. CONCLUSION His-tags are commonly added to proteins during synthesis to allow a convenient and complete purification of the final product and His-tags are subsequently removed by specific enzymes when being attached to the N-terminus. The effects of His-tagged Long-R³-IGF-I in humans have not been elucidated or described and the product may rather be a by-product from biochemical studies than synthesized for injection purposes.
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Affiliation(s)
- Maxie Kohler
- Institute of Biochemistry/Center for Preventive Doping Research, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany
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Boeneman K, Delehanty JB, Susumu K, Stewart MH, Medintz IL. Intracellular bioconjugation of targeted proteins with semiconductor quantum dots. J Am Chem Soc 2010; 132:5975-7. [PMID: 20392040 DOI: 10.1021/ja100201w] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We demonstrate controlled in vivo bioconjugation of a targeted intracellular protein to semiconductor quantum dots (QDs). Metal-affinity driven coordination of oligohistidine-appended proteins for chelated divalent cations was exploited to facilitate this interaction. Monomeric mCherry red fluorescent protein recombinantly engineered to express an N-terminal hexahistidine sequence was expressed from a eukaryotic plasmid vector following transfection into COS-1 cells. QDs solubilized with a carboxylated polymeric ligand and pretreated with Ni(2+) were then microinjected into the mCherry-expressing COS-1 cells. Förster resonance energy transfer (FRET) between the central QD donors and mCherry acceptors specifically coordinated to their surface was utilized to probe and confirm intracellular conjugate formation. We unexpectedly found that mCherry attachment to the QDs also substantially improves its resistance to photobleaching. This proof-of-concept, highlighting targeted intracellular bioconjugation to QDs, suggests that many cytoplasmic proteins expressing the ubiquitous hexahistidine affinity handle can be specifically attached to QDs in vivo. This approach can facilitate long-term monitoring of their spatio-temporal activity or, alternatively, allow engineering and in situ assembly of designer chimeric QD-fluorescent protein sensors.
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Affiliation(s)
- Kelly Boeneman
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, 4555 Overlook Avenue, S.W., Washington, DC 20375, USA
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Hu Q, Wang GY, Liu G, Ou JM, Wang RL. [Ionization energies and infrared spectra studies of histidine using density functional theory]. Guang Pu Xue Yu Guang Pu Fen Xi 2010; 30:1192-1197. [PMID: 20672599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Histidines provide axial ligands to the primary electron donors in photosynthetic reaction centers (RCs) and play an important role in the protein environments of these donors. In this paper the authors present a systematic study of ionization energies and vibrational properties of histidine using hybrid density functional theory (DFT). All calculations were undertaken by using B3LYP method in combination with four basis sets: 6-31G(d), 6-31G(df, p), 6-31+G(d) and 6-311+G(2d, 2p) with the aim to investigate how the basis sets influence the calculation results. To investigate solvent effects and gain a detailed understanding of marker bands of histidine, the ionization energies of histidine and the vibrational frequencies of histidine which are unlabeled and 13C, 15N, and 2H labeled in the gas phase, CCl4, protein environment, THF and water solution, which span a wide range of dielectric constant, were also calculated. Our results showed that: (1) The main geometry parameters of histidine were impacted by basis sets and mediums, and C2-N3 and N3-C4 bond of imidazole ring of histidine side chain display the maximum bond lengths in the gas phase; (2) single point energies and frequencies calculated were decreased while ionization energies increased with the increasing level of basis sets and diffuse function applied in the same solvent; (3) with the same computational method, the higher the dielectric constant of the solvent used, the lower the ionization energy and vibrational frequency and the higher the intensity obtained. In addition, calculated ionization energy in the gas phase and marker bands of histidine as well as frequency shift upon 13C and 15N labeling at the computationally more expensive 6-311+G(2d, 2p) level are in good agreement with experimental observations available in literatures. All calculations indicated that the results calculated by using higher level basis set with diffuse function were more accurate and closer to the experimental value. In conclusion, the results provide useful information for the further studies of the functional and vibrational properties of chlorophyll-a ligated to histidine residue in photosynthetic reaction center.
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Affiliation(s)
- Qiong Hu
- College of Physics and Electronic Information, Yunnan Normal University, Kunming 650092, China
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Bae DR, Han WS, Lim JM, Kang S, Lee JY, Kang D, Jung JH. Lysine-functionalized silver nanoparticles for visual detection and separation of histidine and histidine-tagged proteins. Langmuir 2010; 26:2181-2185. [PMID: 19715339 DOI: 10.1021/la9026865] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new chromogenic chemosensor based on lysine-functionalized silver nanoparticles 1 was prepared and characterized by transmission electron microscopy (TEM), Fourier transform Raman, and ultraviolet-visible (UV-vis) spectroscopy. The color changes of nanoparticles 1 in the absence and the presence of metal ion were observed upon addition of various amino acids and proteins in aqueous solution. Among the various amino acids, the sensor 1 in the absence of metal ion shows a novel colorimetric sensor with capability to probe histidine and histidine-tagged proteins. On the other hand, the color changes of 1 in the presence of metal ions such as KCl or NiCl(2) did not occur with any amino acids. Therefore, the sensor 1 in the absence of metal ion responds selectively to histidine, a response which can be attributed to its aggregation induced by histidine with high numbers of electrostatic interactions. This highly selective sensor 1 allows a rapid quantitative assay of histidine to concentrations as low as 5.0 microM, providing a new tool for the direct measurement of histidine and histidine-tagged proteins in vitro system. Furthermore, we examined the effect of pH on absorbance (A(520)) of 1 in the presence of histidine (pH 4-12). The absorbance under basic conditions was higher than that under acidic or neutral conditions, in accord with the stronger aggregation of 1 with histidine by electrostatic interaction between the carboxylate anion of 1 and ammonium protons of histidine under basic conditions.
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Affiliation(s)
- Doo Ri Bae
- Department of Chemistry and Research Institute of Natural Sciences and Environmental Biotechnology National Core Research Center, Gyeongsang National University, Jinju 660-701, Korea
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Thoma RS, Smith JS, Sandoval W, Leone JW, Hunziker P, Hampton B, Linse KD, Denslow ND. The ABRF Edman Sequencing Research Group 2008 Study: investigation into homopolymeric amino acid N-terminal sequence tags and their effects on automated Edman degradation. J Biomol Tech 2009; 20:216-225. [PMID: 19721823 PMCID: PMC2729483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The Edman Sequence Research Group (ESRG) of the Association of Biomolecular Resource designs and executes interlaboratory studies investigating the use of automated Edman degradation for protein and peptide analysis. In 2008, the ESRG enlisted the help of core sequencing facilities to investigate the effects of a repeating amino acid tag at the N-terminus of a protein. Commonly, to facilitate protein purification, an affinity tag containing a polyhistidine sequence is conjugated to the N-terminus of the protein. After expression, polyhistidine-tagged protein is readily purified via chelation with an immobilized metal affinity resin. The addition of the polyhistidine tag presents unique challenges for the determination of protein identity using Edman degradation chemistry. Participating laboratories were asked to sequence one protein engineered in three configurations: with an N-terminal polyhistidine tag; with an N-terminal polyalanine tag; or with no tag. Study participants were asked to return a data file containing the uncorrected amino acid picomole yields for the first 17 cycles. Initial and repetitive yield (R.Y.) information and the amount of lag were evaluated. Information about instrumentation and sample treatment was also collected as part of the study. For this study, the majority of participating laboratories successfully called the amino acid sequence for 17 cycles for all three test proteins. In general, laboratories found it more difficult to call the sequence containing the polyhistidine tag. Lag was observed earlier and more consistently with the polyhistidine-tagged protein than the polyalanine-tagged protein. Histidine yields were significantly less than the alanine yields in the tag portion of each analysis. The polyhistidine and polyalanine protein-R.Y. calculations were found to be equivalent. These calculations showed that the nontagged portion from each protein was equivalent. The terminal histidines from the tagged portion of the protein were demonstrated to be responsible for the high lag during N-terminal sequence analysis.
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Affiliation(s)
- R S Thoma
- Monsanto Co., St. Louis, MO 63167, USA.
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Yoon SH, Moon JH, Kim MS. Time-resolved photodissociation study of singly protonated peptides with a histidine residue generated by matrix-assisted laser desorption ionization: dissociation rate constant and internal temperature. J Am Soc Mass Spectrom 2009; 20:1522-1529. [PMID: 19467884 DOI: 10.1016/j.jasms.2009.04.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2009] [Revised: 04/11/2009] [Accepted: 04/14/2009] [Indexed: 05/27/2023]
Abstract
Product ion yields in post-source decay and time-resolved photodissociation at 193 and 266 nm were measured for some peptide ions with a histidine residue ([HF(6) + H](+), [F(6)H + H](+), and [F(3)HF(3) + H](+)) formed by matrix-assisted laser desorption ionization (MALDI). Compared with similar data for peptide ions without any basic residue reported previously, significant reduction in dissociation efficiency was observed. Internal temperatures (T) of the peptide ions and their dissociation kinetic parameters-the critical energy (E(0)) and entropy (DeltaS(double dagger))-were determined by the method reported previously. Slight decreases in E(0), DeltaS(double dagger), and T were responsible for the histidine effect-reduction in dissociation rate constant. Regardless of the presence of the residue, DeltaS(double dagger) was far more negative than previous quantum chemical results. Based on this, we propose the existence of transition structures in which the nitrogen atoms in the histidine residue or at the N-terminus coordinate to the reaction centers. Reduction in T in the presence of a histidine residue could not be explained based on popular models for ion formation in MALDI, such as the gas-phase proton transfer model.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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