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Jäger R, Abou Sawan S, Purpura M, Grube B, Röske Y, De Costa P, Chong PW. Proprietary alpha-amylase inhibitor formulation from white kidney bean (Phaseolus vulgaris L.) promotes weight and fat loss: a 12-week, double-blind, placebo-controlled, randomized trial. Sci Rep 2024; 14:12685. [PMID: 38830962 PMCID: PMC11148185 DOI: 10.1038/s41598-024-63443-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Accepted: 05/29/2024] [Indexed: 06/05/2024] Open
Abstract
White kidney bean (Phaseolus vulgaris L.) extracts can aid weight management by reducing calorie intake from complex carbohydrates through alpha-amylase inhibition. We examined the impact of a proprietary aqueous extract from whole dried white kidney beans standardized by its alpha-amylase inhibitor activity (Phase 2 white kidney bean extract (WKBE)) on weight management in subjects with overweight and moderate obesity. In a randomized, double-blind, placebo-controlled fashion, 81 participants completed the study and ingested either a high dose of Phase 2 (1000 mg, WKBE HIGH), a low dose (700 mg, WKBE LOW), or a matching placebo (microcrystalline cellulose, PLA) three times a day, 30 min before meals, for 12 weeks during a calorie restricted diet. In a dose-dependent manner, Phase 2 significantly reduced body weight, fat mass, BMI, waist, hip and in the WKBE HIGH group thigh circumference. Phase 2 is an effective and safe supplement aiding weight and fat loss. ClinicalTrials.gov identifier NCT02930668.
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2
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Hameed S, Saleem F, Özil M, Baltaş N, Salar U, Ashraf S, Ul-Haq Z, Taha M, Khan KM. Indenoquinoxaline-phenylacrylohydrazide hybrids as promising drug candidates for the treatment of type 2 diabetes: In vitro and in silico evaluation of enzyme inhibition and antioxidant activity. Int J Biol Macromol 2024; 263:129517. [PMID: 38266833 DOI: 10.1016/j.ijbiomac.2024.129517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 12/26/2023] [Accepted: 01/13/2024] [Indexed: 01/26/2024]
Abstract
Existing drugs that are being used to treat type-2 diabetes mellitus are associated with several side effects; thus, exploring potential drug candidates is still an utter need these days. Hybrids of indenoquinoxaline and hydrazide have never been explored as antidiabetic agents. In this study, a series of new indenoquinoxaline-phenylacrylohydrazide hybrids (1-30) were synthesized, structurally characterized, and evaluated for α-amylase and α-glucosidase inhibitory activities, as well as for their antioxidant properties. All scaffolds exhibited varying degrees of inhibitory activity against both enzymes, with IC50 values ranging from 2.34 to 61.12 μM for α-amylase and 0.42 to 54.72 μM for α-glucosidase. Particularly, compounds 10, 16, 17, 18, 24, and 25 demonstrated the highest efficacy in inhibiting α-amylase, while compounds 6, 7, 8, 10, 12, 14, 13, 16, 17, 18, 24, and 25 were the most effective α-glucosidase inhibitors, compared to standard acarbose. Moreover, most of these compounds displayed substantial antioxidant potential compared to standard butylated hydroxytoluene (BHT). Kinetics studies revealed competitive inhibition modes by compounds. Furthermore, a comprehensive in silico study and toxicity prediction were also conducted, further validating these analogs as potential drug candidates. The structured compounds demonstrated enhanced profiles, underscoring their potential as primary candidates in drug discovery.
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Affiliation(s)
- Shehryar Hameed
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Faiza Saleem
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Musa Özil
- Department of Chemistry, Recep Tayyip Erdogan University, 53100 Rize, Turkey
| | - Nimet Baltaş
- Department of Chemistry, Recep Tayyip Erdogan University, 53100 Rize, Turkey
| | - Uzma Salar
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Sajda Ashraf
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Zaheer Ul-Haq
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Muhammad Taha
- Department of Clinical Pharmacy, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P. O. Box 1982, Dammam 31441, Saudi Arabia
| | - Khalid Mohammed Khan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; Pakistan Academy of Science, 3-Constitution Avenue, G-5/2, Islamabad 44000, Pakistan.
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Kalinovskii AP, Sintsova OV, Gladkikh IN, Leychenko EV. Natural Inhibitors of Mammalian α-Amylases as Promising Drugs for the Treatment of Metabolic Diseases. Int J Mol Sci 2023; 24:16514. [PMID: 38003703 PMCID: PMC10671682 DOI: 10.3390/ijms242216514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/07/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
α-Amylase is a generally acknowledged molecular target of a distinct class of antidiabetic drugs named α-glucosidase inhibitors. This class of medications is scarce and rather underutilized, and treatment with current commercial drugs is accompanied by unpleasant adverse effects. However, mammalian α-amylase inhibitors are abundant in nature and form an extensive pool of high-affinity ligands that are available for drug discovery. Individual compounds and natural extracts and preparations are promising therapeutic agents for conditions associated with impaired starch metabolism, e.g., diabetes mellitus, obesity, and other metabolic disorders. This review focuses on the structural diversity and action mechanisms of active natural products with inhibitory activity toward mammalian α-amylases, and emphasizes proteinaceous inhibitors as more effective compounds with significant potential for clinical use.
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Affiliation(s)
- Aleksandr P. Kalinovskii
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
| | - Oksana V. Sintsova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690022, Russia; (O.V.S.); (I.N.G.)
| | - Irina N. Gladkikh
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690022, Russia; (O.V.S.); (I.N.G.)
| | - Elena V. Leychenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690022, Russia; (O.V.S.); (I.N.G.)
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Peddio S, Lorrai S, Padiglia A, Cannea FB, Dettori T, Cristiglio V, Genovese L, Zucca P, Rescigno A. Biochemical and Phylogenetic Analysis of Italian Phaseolus vulgaris Cultivars as Sources of α-Amylase and α-Glucosidase Inhibitors. PLANTS (BASEL, SWITZERLAND) 2023; 12:2918. [PMID: 37631130 PMCID: PMC10457751 DOI: 10.3390/plants12162918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023]
Abstract
Phaseolus vulgaris α-amylase inhibitor (α-AI) is a protein that has recently gained commercial interest, as it inhibits mammalian α-amylase activity, reducing the absorption of dietary carbohydrates. Numerous studies have reported the efficacy of preparations based on this protein on the control of glycaemic peaks in type-2 diabetes patients and in overweight subjects. A positive influence on microbiota regulation has also been described. In this work, ten insufficiently studied Italian P. vulgaris cultivars were screened for α-amylase- and α-glucosidase-inhibiting activity, as well as for the absence of antinutritional compounds, such as phytohemagglutinin (PHA). All the cultivars presented α-glucosidase-inhibitor activity, while α-AI was missing in two of them. Only the Nieddone cultivar (ACC177) had no haemagglutination activity. In addition, the partial nucleotide sequence of the α-AI gene was identified with the degenerate hybrid oligonucleotide primer (CODEHOP) strategy to identify genetic variability, possibly linked to functional α-AI differences, expression of the α-AI gene, and phylogenetic relationships. Molecular studies showed that α-AI was expressed in all the cultivars, and a close similarity between the Pisu Grogu and Fasolu cultivars' α-AI and α-AI-4 isoform emerged from the comparison of the partially reconstructed primary structures. Moreover, mechanistic models revealed the interaction network that connects α-AI with the α-amylase enzyme characterized by two interaction hotspots (Asp38 and Tyr186), providing some insights for the analysis of the α-AI primary structure from the different cultivars, particularly regarding the structure-activity relationship. This study can broaden the knowledge about this class of proteins, fuelling the valorisation of Italian agronomic biodiversity through the development of commercial preparations from legume cultivars.
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Affiliation(s)
- Stefania Peddio
- Department of Biomedical Sciences (DiSB), University Campus, Monserrato, 09042 Cagliari, Italy; (S.P.); (S.L.); (T.D.); (A.R.)
| | - Sonia Lorrai
- Department of Biomedical Sciences (DiSB), University Campus, Monserrato, 09042 Cagliari, Italy; (S.P.); (S.L.); (T.D.); (A.R.)
| | - Alessandra Padiglia
- Department of Life and Environmental Sciences (DiSVA), University Campus, Monserrato, 09042 Cagliari, Italy; (A.P.); (F.B.C.)
| | - Faustina B. Cannea
- Department of Life and Environmental Sciences (DiSVA), University Campus, Monserrato, 09042 Cagliari, Italy; (A.P.); (F.B.C.)
| | - Tinuccia Dettori
- Department of Biomedical Sciences (DiSB), University Campus, Monserrato, 09042 Cagliari, Italy; (S.P.); (S.L.); (T.D.); (A.R.)
| | | | - Luigi Genovese
- CEA/MEM/L-Sim, University Grenoble Alpes, 38044 Grenoble, France;
| | - Paolo Zucca
- Department of Biomedical Sciences (DiSB), University Campus, Monserrato, 09042 Cagliari, Italy; (S.P.); (S.L.); (T.D.); (A.R.)
| | - Antonio Rescigno
- Department of Biomedical Sciences (DiSB), University Campus, Monserrato, 09042 Cagliari, Italy; (S.P.); (S.L.); (T.D.); (A.R.)
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Sreepathi N, Kumari VBC, Huligere SS, Al-Odayni AB, Lasehinde V, Jayanthi MK, Ramu R. Screening for potential novel probiotic Levilactobacillus brevis RAMULAB52 with antihyperglycemic property from fermented Carica papaya L. Front Microbiol 2023; 14:1168102. [PMID: 37408641 PMCID: PMC10318367 DOI: 10.3389/fmicb.2023.1168102] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/25/2023] [Indexed: 07/07/2023] Open
Abstract
Probiotics are live microorganisms with various health benefits when consumed in appropriate amounts. Fermented foods are a rich source of these beneficial organisms. This study aimed to investigate the probiotic potential of lactic acid bacteria (LAB) isolated from fermented papaya (Carica papaya L.) through in vitro methods. The LAB strains were thoroughly characterized, considering their morphological, physiological, fermentative, biochemical, and molecular properties. The LAB strain's adherence and resistance to gastrointestinal conditions, as well as its antibacterial and antioxidant capabilities, were examined. Moreover, the strains were tested for susceptibility against specific antibiotics, and safety evaluations encompassed the hemolytic assay and DNase activity. The supernatant of the LAB isolate underwent organic acid profiling (LCMS). The primary objective of this study was to assess the inhibitory activity of α-amylase and α-glucosidase enzymes, both in vitro and in silico. Gram-positive strains that were catalase-negative and carbohydrate fermenting were selected for further analysis. The LAB isolate exhibited resistance to acid bile (0.3% and 1%), phenol (0.1% and 0.4%), and simulated gastrointestinal juice (pH 3-8). It demonstrated potent antibacterial and antioxidant abilities and resistance to kanamycin, vancomycin, and methicillin. The LAB strain showed autoaggregation (83%) and adhesion to chicken crop epithelial cells, buccal epithelial cells, and HT-29 cells. Safety assessments indicated no evidence of hemolysis or DNA degradation, confirming the safety of the LAB isolates. The isolate's identity was confirmed using the 16S rRNA sequence. The LAB strain Levilactobacillus brevis RAMULAB52, derived from fermented papaya, exhibited promising probiotic properties. Moreover, the isolate demonstrated significant inhibition of α-amylase (86.97%) and α-glucosidase (75.87%) enzymes. In silico studies uncovered that hydroxycitric acid, one of the organic acids derived from the isolate, interacted with crucial amino acid residues of the target enzymes. Specifically, hydroxycitric acid formed hydrogen bonds with key amino acid residues, such as GLU233 and ASP197 in α-amylase, and ASN241, ARG312, GLU304, SER308, HIS279, PRO309, and PHE311 in α-glucosidase. In conclusion, Levilactobacillus brevis RAMULAB52, isolated from fermented papaya, possesses promising probiotic properties and exhibits potential as an effective remedy for diabetes. Its resistance to gastrointestinal conditions, antibacterial and antioxidant abilities, adhesion to different cell types, and significant inhibition of target enzymes make it a valuable candidate for further research and potential application in the field of probiotics and diabetes management.
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Affiliation(s)
- Navya Sreepathi
- Department of Biotechnology and Bioinformatics, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
- Department of Pharmacology, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
| | - V. B. Chandana Kumari
- Department of Biotechnology and Bioinformatics, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
| | - Sujay S. Huligere
- Department of Biotechnology and Bioinformatics, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
| | - Abdel-Basit Al-Odayni
- Department of Restorative Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Victor Lasehinde
- Department of Biology, Washington University, St. Louis, MO, United States
| | - M. K. Jayanthi
- Department of Pharmacology, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
| | - Ramith Ramu
- Department of Biotechnology and Bioinformatics, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India
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Hu K, Huang H, Li H, Wei Y, Yao C. Legume-Derived Bioactive Peptides in Type 2 Diabetes: Opportunities and Challenges. Nutrients 2023; 15:nu15051096. [PMID: 36904097 PMCID: PMC10005352 DOI: 10.3390/nu15051096] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
Diabetes mellitus is a complex disorder characterized by insufficient insulin production or insulin resistance, which results in a lifelong dependence on glucose-lowering drugs for almost all patients. During the fight with diabetes, researchers are always thinking about what characteristics the ideal hypoglycemic drugs should have. From the point of view of the drugs, they should maintain effective control of blood sugar, have a very low risk of hypoglycemia, not increase or decrease body weight, improve β-cell function, and delay disease progression. Recently, the advent of oral peptide drugs, such as semaglutide, brings exciting hope to patients with chronic diabetes. Legumes, as an excellent source of protein, peptides, and phytochemicals, have played significant roles in human health throughout human history. Some legume-derived peptides with encouraging anti-diabetic potential have been gradually reported over the last two decades. Their hypoglycemic mechanisms have also been clarified at some classic diabetes treatment targets, such as the insulin receptor signaling pathway or other related pathways involved in the progress of diabetes, and key enzymes including α-amylase, α-glucosidase, and dipeptidyl peptidase-IV (DPP-4). This review summarizes the anti-diabetic activities and mechanisms of peptides from legumes and discusses the prospects of these peptide-based drugs in type 2 diabetes (T2D) management.
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Ávila F, Cruz N, Alarcon-Espósito J, Nina N, Paillan H, Márquez K, Fuentealba D, Burgos-Edwards A, Theoduloz C, Vejar-Vivar C, Schmeda-Hirschmann G. Inhibition of advanced glycation end products and protein oxidation by leaf extracts and phenolics from Chilean bean landraces. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
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8
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Peddio S, Padiglia A, Cannea FB, Crnjar R, Zam W, Sharifi-Rad J, Rescigno A, Zucca P. Common bean (Phaseolus vulgaris L.) α-amylase inhibitors as safe nutraceutical strategy against diabetes and obesity: An update review. Phytother Res 2022; 36:2803-2823. [PMID: 35485365 PMCID: PMC9544720 DOI: 10.1002/ptr.7480] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/22/2022] [Accepted: 04/14/2022] [Indexed: 12/23/2022]
Abstract
Overweight and obesity are constantly increasing, not only in Western countries but also in low‐middle‐income ones. The decrease of both the intake of carbohydrates and their assimilation are among the main dietary strategies to counter these conditions. α‐Amylase, a key enzyme involved in the digestion of carbohydrates, is the target enzyme to reduce the absorption rate of carbohydrates. α‐Amylase inhibitors (α‐AIs) can be found in plants. The common bean, Phaseolus vulgaris is of particular interest due to the presence of protein‐based α‐AIs which, through a protein–protein interaction, reduce the activity of this enzyme. Here we describe the nature of the various types of common bean seed extracts, the type of protein inhibitors they contain, reviewing the recent Literature about their molecular structure and mechanism of action. We also explore the existing evidence (clinical trials conducted on both animals and humans) supporting the potential benefits of this protein inhibitors from P. vulgaris, also highlighting the urgent need of further studies to confirm the clinical efficacy of the commercial products. This work could contribute to summarize the knowledge and application of P. vulgaris extract as a nutraceutical strategy for controlling unwanted weight gains, also highlighting the current limitations.
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Affiliation(s)
- Stefania Peddio
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Alessandra Padiglia
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Faustina B Cannea
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Roberto Crnjar
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Wissam Zam
- Department of Analytical and Food Chemistry, Faculty of Pharmacy, Al-Wadi International University, Tartous, Syria
| | | | - Antonio Rescigno
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Paolo Zucca
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
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Floris S, Fais A, Medda R, Pintus F, Piras A, Kumar A, Kuś PM, Westermark GT, Era B. Washingtonia filifera seed extracts inhibit the islet amyloid polypeptide fibrils formations and α-amylase and α-glucosidase activity. J Enzyme Inhib Med Chem 2021; 36:517-524. [PMID: 33494628 PMCID: PMC7850368 DOI: 10.1080/14756366.2021.1874945] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/27/2020] [Accepted: 01/07/2021] [Indexed: 01/13/2023] Open
Abstract
Washingtonia filifera seeds have revealed to possess antioxidant properties, butyrylcholinesterase and xanthine oxidase inhibition activities. The literature has indicated a relationship between Alzheimer's disease (AD) and type-2 diabetes (T2D). Keeping this in mind, we have now evaluated the inhibitory properties of W. filifera seed extracts on α-amylase, α-glucosidase enzyme activity and the Islet Amyloid Polypeptide (IAPP) fibrils formation. Three extracts from seeds of W. filifera were evaluated for their enzyme inhibitory effect and IC50 values were calculated for all the extracts. The inhibition mode was investigated by Lineweaver-Burk plot analysis and the inhibition of IAPP aggregate formation was monitored. W. filifera methanol seed extract appears as the most potent inhibitor of α-amylase, α-glucosidase, and for the IAPP fibril formation. Current findings indicate new potential of this extract that could be used for the identification or development of novel potential agents for T2D and AD.
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Affiliation(s)
- Sonia Floris
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Antonella Fais
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Rosaria Medda
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Francesca Pintus
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Alessandra Piras
- Department of Chemical and Geological Sciences, University of Cagliari, Cagliari, Italy
| | - Amit Kumar
- Department of Electrical and Electronic Engineering, University of Cagliari, Cagliari, Italy
| | - Piotr Marek Kuś
- Department of Pharmacognosy and Herbal Medicines, Wroclaw Medical University, Wrocław, Poland
| | | | - Benedetta Era
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
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Rane AS, Joshi RS, Giri AP. Molecular determinant for specificity: Differential interaction of α-amylases with their proteinaceous inhibitors. Biochim Biophys Acta Gen Subj 2020; 1864:129703. [PMID: 32805319 DOI: 10.1016/j.bbagen.2020.129703] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 08/10/2020] [Accepted: 08/13/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND α-Amylase inhibitors (α-AIs) belong to the discrete classes, and exhibited differential specificities against α-amylases from various sources. Several α-amylases and their complexes with inhibitors at the molecular level have been studied in detail. Interestingly, some α-AIs depict specific and selective interactions amid different insect α-amylases. SCOPE OF REVIEW There are studies to understand evolutionary variability and functional differentiation of insect α-amylases and their cognate inhibitors. We have examined sequence, structural, and interaction diversity between various α-amylases and α-AIs. Based on these analyses, we are providing a potential basis for the functional differentiation among certain insect α-amylases concerning mammalian counterparts and their interactions with different proteinaceous α-AIs. MAJOR CONCLUSIONS Insect α-amylases have conserved domain architecture with differences in length, number of disulfide bonds, and secondary structure. Furthermore, few of them exhibit variable characteristics like chloride dependent activity, the presence of N-terminal glutamine residue to protect against proteolytic degradation, and loop variations near the enzyme active site. Conformation of α-AI protein could be an essential factor for their specificity and binding affinities towards target α-amylase(s). Furthermore, variation into the enzyme binding pocket residues might contribute to differential interactions with inhibitors. GENERAL SIGNIFICANCE Molecular insights in the interactions between insect α-amylases and plant α-AI will provide the details of mechanisms assisting the inhibitor specificity. Furthermore, this information will help to design potent and effective α-AIs against specific α-amylase.
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Affiliation(s)
- Ashwini S Rane
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India
| | - Rakesh S Joshi
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India.
| | - Ashok P Giri
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India.
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Nolan R, Shannon OM, Robinson N, Joel A, Houghton D, Malcomson FC. It's No Has Bean: A Review of the Effects of White Kidney Bean Extract on Body Composition and Metabolic Health. Nutrients 2020; 12:nu12051398. [PMID: 32414090 PMCID: PMC7284421 DOI: 10.3390/nu12051398] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 04/27/2020] [Accepted: 05/02/2020] [Indexed: 12/18/2022] Open
Abstract
The rising prevalence of overweight and obesity is a global concern, increasing the risk of numerous non-communicable diseases and reducing quality of life. A healthy diet and exercise remain the cornerstone treatments for obesity. However, adherence rates can be low and the effectiveness of these interventions is often less than anticipated, due to compensatory changes in other aspects of the energy balance equation. Whilst some alternative weight-loss therapies are available, these strategies are often associated with side effects and are expensive. An alternative or adjunct to traditional weight-loss approaches may be the use of bioactive compounds extracted from food sources, which can be incorporated into habitual diet with a low cost and minimal burden. One product which has attracted attention in this regard is white kidney bean extract (WKBE), which has been suggested to inhibit the enzyme α-amylase, limiting carbohydrate digestion and absorption with small but potentially meaningful attendant beneficial effects on body weight and metabolic health. In this review, drawing evidence from both human and animal studies, we discuss the current evidence around the effects of WKBE on body composition and metabolic health. In addition, we discuss evidence on the safety of this supplement and explore potential directions for future research.
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Affiliation(s)
- Ruth Nolan
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (R.N.); (O.M.S.); (A.J.)
- School of Agriculture and Food Science, University College Dublin, 4 Dublin, Ireland
| | - Oliver M. Shannon
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (R.N.); (O.M.S.); (A.J.)
| | - Natassia Robinson
- Biosciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK;
| | - Abraham Joel
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (R.N.); (O.M.S.); (A.J.)
| | - David Houghton
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK;
| | - Fiona C. Malcomson
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; (R.N.); (O.M.S.); (A.J.)
- Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne NE2 4HH, UK;
- Correspondence: ; Tel.: +0191-208-1141
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Liu S, Yu J, Guo S, Fang H, Chang X. Inhibition of pancreatic α-amylase by Lonicera caerulea berry polyphenols in vitro and their potential as hyperglycemic agents. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109288] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Subchronic Study of a White Kidney Bean ( Phaseolus vulgaris) Extract with α-Amylase Inhibitory Activity. BIOMED RESEARCH INTERNATIONAL 2019; 2019:9272345. [PMID: 31886266 PMCID: PMC6893270 DOI: 10.1155/2019/9272345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 07/26/2019] [Accepted: 08/21/2019] [Indexed: 11/17/2022]
Abstract
Common bean extract as a dietary supplement has received increased attention globally owing to its α-amylase inhibitory activity. The objective of this study was to evaluate the toxicity of a white kidney bean (Phaseolus vulgaris) extract by a repeated-dose 90-day subchronic oral toxicity study in Sprague-Dawley rats. In the subchronic toxicity study, 80 rats were orally administrated with white kidney bean extract at doses of 4, 2, and 1 g/kg body weight daily for 90 days. The results showed that the white kidney bean extract at doses up to 4 g/kg/day did not induce significant changes in body weight, organ weight, food consumption, hematology, serum biochemistry, and histopathology in rats, as compared to the control. The no-observed-adverse-effect level (NOAEL) of white kidney bean extract was determined to be >4 g/kg/day for both male and female rats, under the experimental conditions of this study.
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Xu Y, Liu N, Fu X, Wang L, Yang Y, Ren Y, Liu J, Wang L. Structural characteristics, biological, rheological and thermal properties of the polysaccharide and the degraded polysaccharide from raspberry fruits. Int J Biol Macromol 2019; 132:109-118. [DOI: 10.1016/j.ijbiomac.2019.03.180] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 02/27/2019] [Accepted: 03/25/2019] [Indexed: 12/16/2022]
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15
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Yan J, Zhao J, Yang R, Zhao W. Bioactive peptides with antidiabetic properties: a review. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14090] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jiai Yan
- State Key Laboratory of Food Science and Technology School of Food Science and Technology Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- National Engineering Research Center for Functional Food Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- Collaborative innovation center of food safety and quality control in Jiangsu Province Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
| | - Jianguang Zhao
- State Key Laboratory of Food Science and Technology School of Food Science and Technology Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- National Engineering Research Center for Functional Food Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- Collaborative innovation center of food safety and quality control in Jiangsu Province Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
| | - Ruijin Yang
- State Key Laboratory of Food Science and Technology School of Food Science and Technology Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- National Engineering Research Center for Functional Food Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- Collaborative innovation center of food safety and quality control in Jiangsu Province Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
| | - Wei Zhao
- State Key Laboratory of Food Science and Technology School of Food Science and Technology Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- National Engineering Research Center for Functional Food Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
- Collaborative innovation center of food safety and quality control in Jiangsu Province Jiangnan University 1800 Lihu Road Wuxi Jiangsu 214122 China
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16
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Antibody specificity and promiscuity. Biochem J 2019; 476:433-447. [PMID: 30723137 DOI: 10.1042/bcj20180670] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 01/06/2019] [Accepted: 01/07/2019] [Indexed: 12/16/2022]
Abstract
The immune system is capable of making antibodies against anything that is foreign, yet it does not react against components of self. In that sense, a fundamental requirement of the body's immune defense is specificity. Remarkably, this ability to specifically attack foreign antigens is directed even against antigens that have not been encountered a priori by the immune system. The specificity of an antibody for the foreign antigen evolves through an iterative process of somatic mutations followed by selection. There is, however, accumulating evidence that the antibodies are often functionally promiscuous or multi-specific which can lead to their binding to more than one antigen. An important cause of antibody cross-reactivity is molecular mimicry. Molecular mimicry has been implicated in the generation of autoimmune response. When foreign antigen shares similarity with the component of self, the antibodies generated could result in an autoimmune response. The focus of this review is to capture the contrast between specificity and promiscuity and the structural mechanisms employed by the antibodies to accomplish promiscuity, at the molecular level. The conundrum between the specificity of the immune system for foreign antigens on the one hand and the multi-reactivity of the antibody on the other has been addressed. Antibody specificity in the context of the rapid evolution of the antigenic determinants and molecular mimicry displayed by antigens are also discussed.
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Ma Y, Rang Y, Yang R, Zhao W. Effect of white kidney bean extracts on estimated glycemic index of different kinds of porridge. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.06.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Tysoe C, Withers SG. Structural Dissection of Helianthamide Reveals the Basis of Its Potent Inhibition of Human Pancreatic α-Amylase. Biochemistry 2018; 57:5384-5387. [DOI: 10.1021/acs.biochem.8b00825] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christina Tysoe
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
- Michael Smith Laboratories, 2125 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Stephen G. Withers
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
- Michael Smith Laboratories, 2125 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
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Sun L, Gidley MJ, Warren FJ. Tea polyphenols enhance binding of porcine pancreatic α-amylase with starch granules but reduce catalytic activity. Food Chem 2018; 258:164-173. [DOI: 10.1016/j.foodchem.2018.03.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 03/02/2018] [Accepted: 03/06/2018] [Indexed: 10/17/2022]
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20
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Udani J, Tan O, Molina J. Systematic Review and Meta-Analysis of a Proprietary Alpha-Amylase Inhibitor from White Bean ( Phaseolus vulgaris L.) on Weight and Fat Loss in Humans. Foods 2018; 7:foods7040063. [PMID: 29677119 PMCID: PMC5920428 DOI: 10.3390/foods7040063] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 11/26/2022] Open
Abstract
The aim of this meta-analysis was to examine the evidence for the effectiveness of a proprietary alpha-amylase inhibitor from white bean (Phaseolus vulgaris L.) supplementation interventions in humans on modification of body weight and fat mass. A systematic literature search was performed using three databases: PubMed, the Cochrane collaboration, and Google Scholar. In addition, the manufacturer was contacted for internal unpublished data, and finally, the reference section of relevant original research and review papers were mined for additional studies. Eleven studies were selected for the meta-analysis of weight loss (a total of 573 subjects), and three studies for the meta-analysis of body fat reduction (a total of 110 subjects), as they fulfilled the inclusion criteria. Phaseolus vulgaris supplementation showed an average effect on weight loss difference of −1.08 kg (95% CI (confidence interval), −0.42 kg to −1.16 kg, p < 0.00001), and the average effect on body fat reduction was 3.26 kg (95% CI, −2.35 kg to −4.163 kg, p = 0.02). This meta-analysis found statistically significant effects of Phaseolus vulgaris supplementation on body weight and body fat.
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Affiliation(s)
- Jay Udani
- Medical Private Practice, Agoura Hills, CA 91301, USA.
| | - Ollie Tan
- Medical Private Practice, Agoura Hills, CA 91301, USA.
| | - Jhanna Molina
- Medical Private Practice, Agoura Hills, CA 91301, USA.
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Toh ZS, Wang H, Yip YM, Lu Y, Lim BJA, Zhang D, Huang D. Phenolic group on A-ring is key for dracoflavan B as a selective noncompetitive inhibitor of α-amylase. Bioorg Med Chem 2015; 23:7641-9. [PMID: 26631440 DOI: 10.1016/j.bmc.2015.11.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 11/06/2015] [Accepted: 11/07/2015] [Indexed: 12/27/2022]
Abstract
A high throughput assay was applied to guide the isolation of a new pancreatic α-amylase inhibitor, dracoflavan B, from the dragon's blood resin from Daemonorops draco. Applying C18 column, we successfully isolated both diastereomers and their structures verified by (1)H NMR spectra in comparison with the literature values. Their activity in inhibition of pancreatic α-amylase with comparable IC50 values of 23μM (A type) and 27μM (B type) that are similar to that of acarbose. Dracoflavan B shows much weaker activity in inhibiting bacterial α-amylase and no activity towards fungal α-amylase. Moreover, both isomers show no inhibitory activity towards mammalian α-glucosidase. Kinetic analysis revealed that using starch as the substrate, dracoflavan B was a non-competitive α-amylase inhibitor with a Ki value of 11.7μM. Lack of α-amylase inhibition for proanthocyanidin A2 dimer demonstrated that dracoflavan B hydrophobic nature of the B, A', C' and B' rings are important for its α-amylase inhibition. In addition, selective chemical modification studies revealed that the phenolic group is also vital to dracoflavan B for its pancreatic α-amylase inhibition activity. Without the A ring phenolic hydrogen bond donor, the derivatives of dracoflavan B showed detrimental α-amylase inhibition. On the contrary, galloylation on the A ring phenolic OH group enhanced the activity as shown by the low IC50 (12μM) against α-amylase which is 56% more potent as compared to dracoflavan B.
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Affiliation(s)
- Zhi Siang Toh
- Food Science and Technology Program, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore
| | - Hongyu Wang
- Food Science and Technology Program, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore
| | - Yew Mun Yip
- Division of Chemistry & Biological Chemistry, 50 Nanyang Ave., Singapore 639798, Republic of Singapore
| | - Yuyun Lu
- Food Science and Technology Program, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore
| | - Benedict Jeffrey Ang Lim
- Food Science and Technology Program, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore
| | - Daiwei Zhang
- Division of Chemistry & Biological Chemistry, 50 Nanyang Ave., Singapore 639798, Republic of Singapore.
| | - Dejian Huang
- Food Science and Technology Program, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore; National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Jiangsu 215123, People's Republic of China.
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22
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23
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Sudha G, Singh P, Swapna LS, Srinivasan N. Weak conservation of structural features in the interfaces of homologous transient protein-protein complexes. Protein Sci 2015; 24:1856-73. [PMID: 26311309 DOI: 10.1002/pro.2792] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 08/13/2015] [Accepted: 08/17/2015] [Indexed: 12/21/2022]
Abstract
Residue types at the interface of protein-protein complexes (PPCs) are known to be reasonably well conserved. However, we show, using a dataset of known 3-D structures of homologous transient PPCs, that the 3-D location of interfacial residues and their interaction patterns are only moderately and poorly conserved, respectively. Another surprising observation is that a residue at the interface that is conserved is not necessarily in the interface in the homolog. Such differences in homologous complexes are manifested by substitution of the residues that are spatially proximal to the conserved residue and structural differences at the interfaces as well as differences in spatial orientations of the interacting proteins. Conservation of interface location and the interaction pattern at the core of the interfaces is higher than at the periphery of the interface patch. Extents of variability of various structural features reported here for homologous transient PPCs are higher than the variation in homologous permanent homomers. Our findings suggest that straightforward extrapolation of interfacial nature and inter-residue interaction patterns from template to target could lead to serious errors in the modeled complex structure. Understanding the evolution of interfaces provides insights to improve comparative modeling of PPC structures.
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Affiliation(s)
- Govindarajan Sudha
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, Karnataka, India
| | - Prashant Singh
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, Karnataka, India
| | - Lakshmipuram S Swapna
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, Karnataka, India
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Xu Y, Zhang L, Yang Y, Song X, Yu Z. Optimization of ultrasound-assisted compound enzymatic extraction and characterization of polysaccharides from blackcurrant. Carbohydr Polym 2015; 117:895-902. [DOI: 10.1016/j.carbpol.2014.10.032] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 09/09/2014] [Accepted: 10/14/2014] [Indexed: 11/25/2022]
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25
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Scientific Opinion on the substantiation of a health claim related to a standardised aqueous extract from white kidney bean ( Phaseolus vulgarisL.) and reduction of body weight pursuant to Article 13(5) of Regulation (EC) No 1924/2006. EFSA J 2014. [DOI: 10.2903/j.efsa.2014.3754] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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26
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da Silva MCM, Del Sarto RP, Lucena WA, Rigden DJ, Teixeira FR, Bezerra CDA, Albuquerque EVS, Grossi-de-Sa MF. Employing in vitro directed molecular evolution for the selection of α-amylase variant inhibitors with activity toward cotton boll weevil enzyme. J Biotechnol 2013; 167:377-85. [PMID: 23892157 DOI: 10.1016/j.jbiotec.2013.07.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 07/09/2013] [Accepted: 07/11/2013] [Indexed: 01/30/2023]
Abstract
Numerous species of insect pests attack cotton plants, out of which the cotton boll weevil (Anthonomus grandis) is the main insect in Brazil and must be controlled to avert large economic losses. Like other insect pests, A. grandis secretes a high level of α-amylases in the midgut lumen, which are required for digestion of carbohydrates. Thus, α-amylase inhibitors (α-AIs) represent a powerful tool to apply in the control of insect pests. Here, we applied DNA shuffling and phage display techniques and obtained a combinatorial library containing 10⁸ α-AI variant forms. From this library, variants were selected exhibiting in vitro affinity for cotton boll weevil α-amylases. Twenty-six variant sequences were cloned into plant expression vectors and expressed in Arabidopsis thaliana. Transformed plant extracts were assayed in vitro to select specific and potent α-amylase inhibitors against boll weevil amylases. While the wild type inhibitors, used to create the shuffled library, did not inhibit the A. grandis α-amylases, three α-AI mutants, named α-AIC3, α-AIA11 and α-AIG4 revealed high inhibitory activities against A. grandis α-amylases in an in vitro assay. In summary, data reported here shown the potential biotechnology of new α-AI variant genes for cotton boll weevil control.
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Affiliation(s)
- Maria Cristina Mattar da Silva
- Embrapa Recursos Genéticos e Biotecnologia, Laboratório Interação Molecular Planta Praga, Asa Norte, Brasília, DF 70770-917, Brazil.
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27
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Capocchi A, Muccilli V, Cunsolo V, Saletti R, Foti S, Fontanini D. A heterotetrameric alpha-amylase inhibitor from emmer (Triticum dicoccon Schrank) seeds. PHYTOCHEMISTRY 2013; 88:6-14. [PMID: 23320956 DOI: 10.1016/j.phytochem.2012.12.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 12/04/2012] [Accepted: 12/17/2012] [Indexed: 06/01/2023]
Abstract
Plants have developed a constitutive defense system against pest attacks, which involves the expression of a set of inhibitors acting on heterologous amylases of different origins. Investigating the soluble protein complement of the hulled wheat emmer we have isolated and characterized a heterotetrameric α-amylase inhibitor (ETI). Based on mass spectrometry data, it is an assembly of proteins highly similar to the CM2/CM3/CM16 found in durum wheat. Our data indicate that these proteins can also inhibit exogenous α-amylases in binary assemblies. The calculated dissociation constants (K(i)) for the pancreatic porcine amylase- and human salivary amylase-ETI complexes are similar to those found in durum and soft wheat. Homology modeling of the CM subunits indicate structural similarities with other proteins belonging to the cereal family of trypsin/α-amylase inhibitors; a possible homology modeled structure for a tetrameric assembly of the subunits is proposed.
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Affiliation(s)
- A Capocchi
- Department of Biology, University of Pisa, Via L. Ghini 5, 56126 Pisa, Italy
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28
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Tawil G, Viksø-Nielsen A, Rolland-Sabaté A, Colonna P, Buléon A. In depth study of a new highly efficient raw starch hydrolyzing α-amylase from Rhizomucor sp. Biomacromolecules 2010; 12:34-42. [PMID: 21158480 DOI: 10.1021/bm100913z] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new α-amylase from Rhizomucor sp. (RA) was studied in detail due to its very efficient hydrolysis of raw starch granules at low temperature (32 °C). RA contains a starch binding domain (SBD) connected to the core amylase catalytic domain by a O-glycosylated linker. The mode of degradation of native maize starch granules and, in particular, the changes in the starch structure during the hydrolysis, was monitored for hydrolysis of raw starch at concentrations varying between 0.1 and 31%. RA was compared to porcine pancreatic α-amylase (PPA), which has been widely studied either on resistant starch or as a model enzyme in solid starch hydrolysis studies. RA is particularly efficient on native maize starch and release glucose only. The hydrolysis rate reaches 75% for a 31% starch solution and is complete at 0.1% starch concentration. The final hydrolysis rate was dependent on both starch concentration and enzyme amount applied. RA is also very efficient in hydrolyzing the crystalline domains in the maize starch granule. The major A-type crystalline structure is more rapidly degraded than amorphous domains in the first stages of hydrolysis. This is in agreement with the observed preferential hydrolysis of amylopectin, the starch constituent that forms the backbone of the crystalline part of the granule. Amylose-lipid complexes present in most cereal starches are degraded in a second stage, yielding amylose fragments that then reassociate into B-type crystalline structures, forming the final resistant fraction.
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Affiliation(s)
- Georges Tawil
- UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes
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Nocek B, Bigelow L, Abdullah J, Joachimiak A. Structure of SO2946 orphan from Shewanella oneidensis shows "jelly-roll" fold with carbohydrate-binding module. JOURNAL OF STRUCTURAL AND FUNCTIONAL GENOMICS 2008; 9:1-6. [PMID: 18566914 PMCID: PMC2678837 DOI: 10.1007/s10969-008-9040-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Accepted: 05/20/2008] [Indexed: 05/26/2023]
Abstract
The crystal structure of the uncharacterized protein SO2946 from Shewanella oneidensis MR-1 was determined with single-wavelength anomalous diffraction (SAD) and refined to 2.0 A resolution. The SO2946 protein consists of a short helical N-terminal domain and a large C-terminal domain with the "jelly-roll" topology. The protein assembles into a propeller consisting of three C-terminal blades arranged around a central core formed by the N-terminal domains. The function of SO2946 could not be inferred from the sequence since the protein represents an orphan with no sequence homologs, but the protein's structure bears a fold similar to that of proteins containing carbohydrate-binding modules. Features such as fold conservation, the presence of a conserved groove and a metal binding region are indicative that SO2946 may be an enzyme and could be involved in binding carbohydrate molecules.
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Affiliation(s)
- B. Nocek
- Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Building 202, Argonne, IL 60439, USA
| | - L. Bigelow
- Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Building 202, Argonne, IL 60439, USA
| | - J. Abdullah
- Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Building 202, Argonne, IL 60439, USA
| | - A. Joachimiak
- Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Building 202, Argonne, IL 60439, USA
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Abstract
The present review assesses the potential of thePhaseolus vulgarisα-amylase inhibitor isoform 1 (α-AI1) starch blockers as a widely used remedy against obesity and diabetes. Consumption of the α-amylase inhibitor causes marginal intraluminal α-amylase activity facilitated by the inhibitor's appropriate structural, physico-chemical and functional properties. As a result there is decreased postprandial plasma hyperglycaemia and insulin levels, increased resistance of starch to digestion and increased activity of colorectal bacteria. The efficacy and safety of the amylase inhibitor extracts, however, depend on the processing and extraction techniques used. The extracts are potential ingredients in foods for increased carbohydrate tolerance in diabetics, decreased energy intake for reducing obesity and for increased resistant starch. Research developments in the distribution and biosynthesis of the α-amylase inhibitor, relevant physico-chemical properties, the molecular starch-blocking mechanism, anti-obesity and anti-diabetes effects, safety of extracts and the need for research into their potential anti-colorectal cancer effect are discussed.
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Yuriev E, Sandrin M, Ramsland P. Antibody–ligand docking: insights into peptide–carbohydrate mimicry. MOLECULAR SIMULATION 2008. [DOI: 10.1080/08927020701665995] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Valencia-Jiménez A, Arboleda Valencia JW, Grossi-De-Sá MF. Activity of alpha-amylase inhibitors from Phaseolus coccineus on digestive alpha-amylases of the coffee berry borer. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:2315-2320. [PMID: 18321052 DOI: 10.1021/jf0733564] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Seeds of scarlet runner bean ( Phaseolus coccineus L.) were analyzed for alpha-amylase inhibitor (alpha-AI) activity. Through the use of polyclonal antibodies raised against pure alpha-AI-1 from common bean ( Phaseolus vulgaris L.), typical alpha-AlphaIota polypeptides (Mr 14-18 kDa) as well as a large polypeptide of Mr 32000 Da, usually referred to as "amylase inhibitor like", were detected. The inhibitor activity present in four accessions of P. coccineus was examined, both in semiquantitative zymograms allowing the separation of different isoforms and in quantitative assays against human salivary amylase, porcine pancreatic amylase, and coffee berry borer, Hypothenemus hampei Ferrari (Coleoptera: Scolytidae) amylase. Differential inhibition curves lead to the suggestion that the gene encoding one of the inhibitors in P. coccineus (in accession G35590) would be a good candidate for genetic engineering of coffee resistance toward the coffee berry borer. An in vitro proteolytic digestion treatment of pure alpha-AlphaIota-1 resulted in a rapid loss of the inhibitory activity, seriously affecting its natural capacity to interact with mammalian alpha-amylases.
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Johnson MA, Pinto BM. Structural and functional studies of Peptide-carbohydrate mimicry. Top Curr Chem (Cham) 2008; 273:55-116. [PMID: 23605459 DOI: 10.1007/128_2007_18] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Certain peptides act as molecular mimics of carbohydrates in that they are specifically recognizedby carbohydrate-binding proteins. Peptides that bind to anti-carbohydrate antibodies, carbohydrate-processingenzymes, and lectins have been identified. These peptides are potentially useful as vaccines andtherapeutics; for example, immunologically functional peptide molecular mimics (mimotopes) can strengthenor modify immune responses induced by carbohydrate antigens. However, peptides that bind specificallyto carbohydrate-binding proteins may not necessarily show the corresponding biological activity, andfurther selection based on biochemical studies is always required. The degree of structural mimicryrequired to generate the desired biological activity is therefore an interesting question. This reviewwill discuss recent structural studies of peptide-carbohydrate mimicry employing NMR spectroscopy,X-ray crystallography, and molecular modeling, as well as relevant biochemical data. These studiesprovide insights into the basis of mimicry at the molecular level. Comparisons with other carbohydrate-mimeticcompounds, namely proteins and glycopeptides, will be drawn. Finally, implications for the designof new therapeutic compounds will also be presented.
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Affiliation(s)
- Margaret A Johnson
- Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Rd., MB-44, 92037, La Jolla, CA, USA,
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Dharmasena MN, Jewell DA, Taylor RK. Development of peptide mimics of a protective epitope of Vibrio cholerae Ogawa O-antigen and investigation of the structural basis of peptide mimicry. J Biol Chem 2007; 282:33805-33816. [PMID: 17881351 DOI: 10.1074/jbc.m707314200] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
As an alternative approach toward the development of a cholera vaccine, the potential of peptide mimics of Vibrio cholerae lipopolysaccharide (LPS) to elicit cross-reactive immune responses against LPS was investigated. Two closely related protective monoclonal antibodies, S-20-4 and A-20-6, which are specific for Ogawa O-antigen (O-specific polysaccharide; O-SP) of V. cholerae O1, were used as the target antibodies (Abs) to pan phage display libraries under different elution conditions. Six phage clones identified from S-20-4 panning showed significant binding to both S-20-4 and A-20-6. Thus, it is likely that these phage-displayed peptides mimic an important conformational epitope of Ogawa antigens and are not simply functionally recognized by S-20-4. Each of the six phage clones that could bind to both monoclonal antibodies also competed with LPS for binding to S-20-4, suggesting that the peptides bind close to the paratope of the Ab. In order to predict how these peptide mimics interact with S-20-4 compared with its carbohydrate counterpart, one peptide mimic, 4P-8, which is one of the highest affinity binders and shares motifs with several other peptide mimics, was selected for further studies using computer modeling methods and site-directed mutagenesis. These studies suggest that 4P-8 is recognized as a hairpin structure that mimics some O-SP interactions with S-20-4 and also makes unique ligand interactions with S-20-4. In addition, 4P-8-KLH was able to elicit anti-LPS Abs in mice, but the immune response was not vibriocidal or protective. However, boosting with 4P-8-KLH after immunizing with LPS prolonged the LPS-reactive IgG and IgM Ab responses as well as vibriocidal titers and provided a much greater degree of protection than priming with LPS alone.
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Affiliation(s)
- Madushini N Dharmasena
- Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, New Hampshire, 03755
| | - David A Jewell
- Department of Genetics, Dartmouth Medical School, Hanover, New Hampshire 03755
| | - Ronald K Taylor
- Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, New Hampshire, 03755.
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35
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Kim YH, Woloshuk CP, Cho EH, Bae JM, Song YS, Huh GH. Cloning and functional expression of the gene encoding an inhibitor against Aspergillus flavus alpha-amylase, a novel seed lectin from Lablab purpureus (Dolichos lablab). PLANT CELL REPORTS 2007; 26:395-405. [PMID: 17149640 DOI: 10.1007/s00299-006-0250-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2006] [Revised: 09/14/2006] [Accepted: 09/17/2006] [Indexed: 05/12/2023]
Abstract
Maize is one of the more important agricultural crops in the world and, under certain conditions, prone to attack from pathogenic fungi. One of these, Aspergillus flavus, produces toxic and carcinogenic metabolites, called aflatoxins, as byproducts of its infection of maize kernels. The alpha-amylase of A. flavus is known to promote aflatoxin production in the endosperm of these infected kernels, and a 36-kDa protein from the Lablab purpureus, denoted AILP, has been shown to inhibit alpha-amylase production and the growth of A. flavus. Here, we report the isolation of six full-length labAI genes encoding AILP and a detailed analysis of the activities of the encoded proteins. Each of the six labAI genes encoded sequences of 274 amino acids, with the deduced amino acid sequences showing approximately 95-99% identity. The sequences are similar to those of lectin members of a legume lectin-arcelin-alpha-amylase inhibitor family reported to function in plant resistance to insect pests. The labAI genes did not show any of the structures characteristic of conserved structures identified in alpha-amylase inhibitors to date. The recombinant proteins of labAI-1 and labAI-2 agglutinated human red blood cells and inhibited A. flavus alpha-amylase in a manner similar to that shown by AILP. These data indicate that labAI genes are a new class of lectin members in legume seeds and that their proteins have both lectin and alpha-amylase inhibitor activity. These results are a valuable contribution to our knowledge of plant-pathogen interactions and will be applicable for developing protocols aimed at controlling A. flavus infection.
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Affiliation(s)
- Young-Hwa Kim
- School of Food and Life Science, BPRC, Inje University, Obangdong, 607, Gyungnam, Korea
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36
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van Dijk ADJ, Bonvin AMJJ. Solvated docking: introducing water into the modelling of biomolecular complexes. ACTA ACUST UNITED AC 2006; 22:2340-7. [PMID: 16899489 DOI: 10.1093/bioinformatics/btl395] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
MOTIVATION Interfacial water, which plays an important role in mediating biomolecular interactions, has been neglected in the modelling of biomolecular complexes. METHODS We present a solvated docking approach that explicitly accounts for the presence of water in protein-protein complexes. Our solvated docking protocol is based on the concept of the first encounter complex in which a water layer is present in-between the molecules. It mimics the pathway from this initial complex towards the final assembly in which most waters have been expelled from the interface. Docking is performed from solvated biomolecules and waters are removed in a biased Monte Carlo procedure based on water-mediated contact propensities obtained from an analysis of high-resolution crystal structures. RESULTS We demonstrate the feasibility of this approach for protein-protein complexes representing both 'wet' and 'dry' interfaces. Solvated docking leads to improvements both in quality and scoring. Water molecules are recovered that closely match the ones in the crystal structures. AVAILABILTY Solvated docking will be made available in the future release of HADDOCK version 2.0 (http://www.nmr.chem.uu.nl/haddock).
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Affiliation(s)
- Aalt D J van Dijk
- Bijvoet Center for Biomolecular Research, Science Faculty, Utrecht University 3584CH, Utrecht, The Netherlands
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37
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Abstract
In this issue of Chemistry and Biology, a library screening approach reveals a linear octapeptide inhibitor of alpha-amylases reached by de novo design . The selected molecule shares characteristics with naturally occurring protein inhibitors -- a result that suggests general rules for the design of peptide-based amylase inhibitors may be achievable.
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Affiliation(s)
- Nicola Pohl
- Department of Chemistry and The Plant Sciences Institute, Gilman Hall, Iowa State University, Ames, Iowa 50011, USA
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38
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Dolecková-Maresová L, Pavlík M, Horn M, Mares M. De novo design of alpha-amylase inhibitor: a small linear mimetic of macromolecular proteinaceous ligands. ACTA ACUST UNITED AC 2006; 12:1349-57. [PMID: 16356852 DOI: 10.1016/j.chembiol.2005.10.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2005] [Revised: 09/14/2005] [Accepted: 10/11/2005] [Indexed: 11/28/2022]
Abstract
We report a low molecular weight inhibitor of alpha-amylases based on a linear peptidic scaffold designed de novo through the use of combinatorial chemistry. The inhibitory motif denoted PAMI (peptide amylase inhibitor) was selected by using L-peptide libraries and was fine-tuned by the introduction of unnatural modifications. PAMI specifically inhibits glycoside hydrolases of family 13. Its interaction with porcine pancreatic alpha-amylase was characterized by inhibition kinetics, fluorescence competition assays with natural alpha-amylase inhibitors, and isothermal titration calorimetry. We demonstrate that the critical amino acid residues in PAMI are shared with those in the macromolecular proteinaceous inhibitors that, however, bind to alpha-amylases through a spatially scattered set of intermolecular contacts. Thus, natural molecular evolution as well as combinatorial evolution selected the same alpha-amylase binding determinants for completely different spatial frameworks.
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Affiliation(s)
- Lucie Dolecková-Maresová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of The Czech Republic, Flemingovo nam. 2, 16610 Praha, Czech Republic
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39
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Pelegrini PB, Murad AM, Grossi-de-Sá MF, Mello LV, Romeiro LAS, Noronha EF, Caldas RA, Franco OL. Structure and enzyme properties of Zabrotes subfasciatus alpha-amylase. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2006; 61:77-86. [PMID: 16416448 DOI: 10.1002/arch.20099] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Digestive alpha-amylases play an essential role in insect carbohydrate metabolism. These enzymes belong to an endo-type group. They catalyse starch hydrolysis, and are involved in energy production. Larvae of Zabrotes subfasciatus, the Mexican bean weevil, are able to infest stored common beans Phaseolus vulgaris, causing severe crop losses in Latin America and Africa. Their alpha-amylase (ZSA) is a well-studied but not completely understood enzyme, having specific characteristics when compared to other insect alpha-amylases. This report provides more knowledge about its chemical nature, including a description of its optimum pH (6.0 to 7.0) and temperature (20-30 degrees C). Furthermore, ion effects on ZSA activity were also determined, showing that three divalent ions (Mn2+, Ca2+, and Ba2+) were able to enhance starch hydrolysis. Fe2+ appeared to decrease alpha-amylase activity by half. ZSA kinetic parameters were also determined and compared to other insect alpha-amylases. A three-dimensional model is proposed in order to indicate probable residues involved in catalysis (Asp204, Glu240, and Asp305) as well other important residues related to starch binding (His118, Ala206, Lys207, and His304).
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Affiliation(s)
- Patrícia B Pelegrini
- Centro de Análises Proteômicas e Bioquímica, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasilia, Brasília-DF, Brazil
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40
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Rao FV, Houston DR, Boot RG, Aerts JMFG, Hodkinson M, Adams DJ, Shiomi K, Omura S, van Aalten DMF. Specificity and affinity of natural product cyclopentapeptide inhibitors against A. fumigatus, human, and bacterial chitinases. ACTA ACUST UNITED AC 2005; 12:65-76. [PMID: 15664516 DOI: 10.1016/j.chembiol.2004.10.013] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2004] [Revised: 10/07/2004] [Accepted: 10/14/2004] [Indexed: 11/30/2022]
Abstract
Family 18 chitinases play key roles in organisms ranging from bacteria to man. There is a need for specific, potent inhibitors to probe the function of these chitinases in different organisms. Such molecules could also provide leads for the development of chemotherapeuticals with fungicidal, insecticidal, or anti-inflammatory potential. Recently, two natural product peptides, argifin and argadin, have been characterized, which structurally mimic chitinase-chitooligosaccharide interactions and inhibit a bacterial chitinase in the nM-mM range. Here, we show that these inhibitors also act on human and Aspergillus fumigatus chitinases. The structures of these enzymes in complex with argifin and argadin, together with mutagenesis, fluorescence, and enzymology, reveal that subtle changes in the binding site dramatically affect affinity and selectivity. The data show that it may be possible to develop specific chitinase inhibitors based on the argifin/argadin scaffolds.
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Affiliation(s)
- Francesco V Rao
- Division of Biological Chemistry & Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland
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41
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Abstract
We present an analysis of the water molecules immobilized at the protein-protein interfaces of 115 homodimeric proteins and 46 protein-protein complexes, and compare them with 173 large crystal packing interfaces representing nonspecific interactions. With an average of 15 waters per 1000 A2 of interface area, the crystal packing interfaces are more hydrated than the specific interfaces of homodimers and complexes, which have 10-11 waters per 1000 A2, reflecting the more hydrophilic composition of crystal packing interfaces. Very different patterns of hydration are observed: Water molecules may form a ring around interfaces that remain "dry," or they may permeate "wet" interfaces. A majority of the specific interfaces are dry and most of the crystal packing interfaces are wet, but counterexamples exist in both categories. Water molecules at interfaces form hydrogen bonds with protein groups, with a preference for the main-chain carbonyl and the charged side-chains of Glu, Asp, and Arg. These interactions are essentially the same in specific and nonspecific interfaces, and very similar to those observed elsewhere on the protein surface. Water-mediated polar interactions are as abundant at the interfaces as direct protein-protein hydrogen bonds, and they may contribute to the stability of the assembly.
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Affiliation(s)
- Francis Rodier
- Laboratoire d'Enzymologie et de Biochimie Structurales, Gif-sur-Yvette, France
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42
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Bønsager BC, Nielsen PK, Abou Hachem M, Fukuda K, Praetorius-Ibba M, Svensson B. Mutational Analysis of Target Enzyme Recognition of the β-Trefoil Fold Barley α-Amylase/Subtilisin Inhibitor. J Biol Chem 2005; 280:14855-64. [PMID: 15657043 DOI: 10.1074/jbc.m412222200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The barley alpha-amylase/subtilisin inhibitor (BASI) inhibits alpha-amylase 2 (AMY2) with subnanomolar affinity. The contribution of selected side chains of BASI to this high affinity is discerned in this study, and binding to other targets is investigated. Seven BASI residues along the AMY2-BASI interface and four residues in the putative protease-binding loop on the opposite side of the inhibitor were mutated. A total of 15 variants were compared with the wild type by monitoring the alpha-amylase and protease inhibitory activities using Blue Starch and azoalbumin, respectively, and the kinetics of binding to target enzymes by surface plasmon resonance. Generally, the mutations had little effect on k(on), whereas the k(off) values were increased up to 67-fold. The effects on the inhibitory activity, however, were far more pronounced, and the K(i) values of some mutants on the AMY2-binding side increased 2-3 orders of magnitude, whereas mutations on the other side of the inhibitor had virtually no effect. The mutants K140L, D150N, and E168T lost inhibitory activity, revealing the pivotal role of charge interactions for BASI activity on AMY2. A fully hydrated Ca(2+) at the AMY2-BASI interface mediates contacts to the catalytic residues of AMY2. Mutations involving residues contacting the solvent ligands of this Ca(2+) had weaker affinity for AMY2 and reduced sensitivity to the Ca(2+) modulation of the affinity. These results suggest that the Ca(2+) and its solvation sphere are integral components of the AMY2-BASI complex, thus illuminating a novel mode of inhibition and a novel role for calcium in relation to glycoside hydrolases.
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Affiliation(s)
- Birgit C Bønsager
- Department of Chemistry, Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-2500 Valby, Copenhagen Denmark
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43
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Yamasaki M, Moriwaki S, Miyake O, Hashimoto W, Murata K, Mikami B. Structure and Function of a Hypothetical Pseudomonas aeruginosa Protein PA1167 Classified into Family PL-7. J Biol Chem 2004; 279:31863-72. [PMID: 15136569 DOI: 10.1074/jbc.m402466200] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Structural and functional analyses of alginate lyases are important in the clarification of the biofilm-dependent ecosystem in Pseudomonas aeruginosa and in the development of therapeutic agents for bacterial disease. Most alginate lyases are classified into polysaccharide lyase (PL) family-5 and -7 based on their primary structures. Family PL-7 enzymes are still poorly characterized especially in structural properties. Among family PL-7, a gene coding for a hypothetical protein (PA1167) homologous to Sphingomonas alginate lyase A1-II was found to be present in the P. aeruginosa genome. PA1167 overexpressed in Escherichia coli cleaved glycosidic bonds in alginate and released unsaturated saccharides, indicating that PA1167 is an alginate lyase catalyzing a beta-elimination reaction. The enzyme acted preferably on heteropolymeric regions endolytically and worked most efficiently at pH 8.5 and 40 degrees C. The specific activity of PA1167, however, was much weaker than that of the known alginate lyase AlgL, suggesting that AlgL plays a main role in alginate depolymerization in P. aeruginosa. In addition to this specific activity, differences were found between PA1167 and AlgL in enzyme properties such as molecular mass, optimum pH, salt effect, and substrate specificity. The first crystal structure of the family PL-7 alginate lyase was determined at 2.0 A resolution. PA1167 was found to form a glove-like beta-sandwich composed of 15 beta-strands and 3 alpha-helices. The structural difference between the beta-sandwich PA1167 of family PL-7 and alpha/alpha-barrel AlgL of family PL-5 may be responsible for the enzyme characteristics. Crystal structures of polysaccharide lyases determined so far indicate that they can be assigned to three folding groups having parallel beta-helix, alpha/alpha-barrel, and alpha/alpha-barrel + antiparallel beta-sheet structures as basic frames. PA1167 is the fourth novel folding structure found among polysaccharide lyases.
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Affiliation(s)
- Masayuki Yamasaki
- Division of Agronomy and Horticultural Science, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
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44
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Payan F, Leone P, Porciero S, Furniss C, Tahir T, Williamson G, Durand A, Manzanares P, Gilbert HJ, Juge N, Roussel A. The dual nature of the wheat xylanase protein inhibitor XIP-I: structural basis for the inhibition of family 10 and family 11 xylanases. J Biol Chem 2004; 279:36029-37. [PMID: 15181003 DOI: 10.1074/jbc.m404225200] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The xylanase inhibitor protein I (XIP-I) from wheat Triticum aestivum is the prototype of a novel class of cereal protein inhibitors that inhibit fungal xylanases belonging to glycoside hydrolase families 10 (GH10) and 11 (GH11). The crystal structures of XIP-I in complex with Aspergillus nidulans (GH10) and Penicillium funiculosum (GH11) xylanases have been solved at 1.7 and 2.5 A resolution, respectively. The inhibition strategy is novel because XIP-I possesses two independent enzyme-binding sites, allowing binding to two glycoside hydrolases that display a different fold. Inhibition of the GH11 xylanase is mediated by the insertion of an XIP-I Pi-shaped loop (Lalpha(4)beta(5)) into the enzyme active site, whereas residues in the helix alpha7 of XIP-I, pointing into the four central active site subsites, are mainly responsible for the reversible inactivation of GH10 xylanases. The XIP-I strategy for inhibition of xylanases involves substrate-mimetic contacts and interactions occluding the active site. The structural determinants of XIP-I specificity demonstrate that the inhibitor is able to interact with GH10 and GH11 xylanases of both fungal and bacterial origin. The biological role of the xylanase inhibitors is discussed in light of the present structural data.
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Affiliation(s)
- Françoise Payan
- Architecture et Fonction de Macromolécules Biologiques, UMR-6098, CNRS et Universités d'Aix-Marseille I et II, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
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45
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Payan F. Structural basis for the inhibition of mammalian and insect alpha-amylases by plant protein inhibitors. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:171-80. [PMID: 14871658 DOI: 10.1016/j.bbapap.2003.10.012] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2003] [Accepted: 10/23/2003] [Indexed: 11/23/2022]
Abstract
Alpha-amylases are ubiquitous proteins which play an important role in the carbohydrate metabolism of microorganisms, animals and plants. Living organisms use protein inhibitors as a major tool to regulate the glycolytic activity of alpha-amylases. Most of the inhibitors for which three-dimensional (3-D) structures are available are directed against mammalian and insect alpha-amylases, interacting with the active sites in a substrate-like manner. In this review, we discuss the detailed inhibitory mechanism of these enzymes in light of the recent determination of the 3-D structures of pig pancreatic, human pancreatic, and yellow mealworm alpha-amylases in complex with plant protein inhibitors. In most cases, the mechanism of inhibition occurs through the direct blockage of the active center at several subsites of the enzyme. Inhibitors exhibiting "dual" activity against mammalian and insect alpha-amylases establish contacts of the same type in alternative ways.
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Affiliation(s)
- Françoise Payan
- Architecture et Fonction des Macromolécules Biologiques, UMR6098, CNRS and Universities Aix-Marseille I and II, 31 Chemin Joseph Aiguier, F-13402 Marseilles, France.
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46
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Nielsen PK, Bønsager BC, Fukuda K, Svensson B. Barley α-amylase/subtilisin inhibitor: structure, biophysics and protein engineering. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:157-64. [PMID: 14871656 DOI: 10.1016/j.bbapap.2003.09.019] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2003] [Accepted: 09/11/2003] [Indexed: 10/26/2022]
Abstract
Bifunctional alpha-amylase/subtilisin inhibitors have been implicated in plant defence and regulation of endogenous alpha-amylase action. The barley alpha-amylase/subtilisin inhibitor (BASI) inhibits the barley alpha-amylase 2 (AMY2) and subtilisin-type serine proteases. BASI belongs to the Kunitz-type trypsin inhibitor family of the beta-trefoil fold proteins. Diverse approaches including site-directed mutagenesis, hybrid constructions, and crystallography have been used to characterise the structures and contact residues in the AMY2/BASI complex. The three-dimensional structure of the AMY2/BASI complex is characterised by a completely hydrated Ca2+ situated at the protein interface that connects the three catalytic carboxyl groups in AMY2 with side chains in BASI via water molecules. Using surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC), we have recently demonstrated Ca2+-modulated kinetics of the AMY2/BASI interaction and found that the complex formation involves minimal structural changes. The modulation of the interaction by calcium ions makes it unique among the currently known binding mechanisms of proteinaceous alpha-amylase inhibitors.
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Affiliation(s)
- Peter K Nielsen
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10 Valby, DK-2500 Copenhagen, Denmark
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47
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Bellincampi D, Camardella L, Delcour JA, Desseaux V, D'Ovidio R, Durand A, Elliot G, Gebruers K, Giovane A, Juge N, Sørensen JF, Svensson B, Vairo D. Potential physiological role of plant glycosidase inhibitors. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:265-74. [PMID: 14871667 DOI: 10.1016/j.bbapap.2003.10.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2003] [Accepted: 10/23/2003] [Indexed: 11/22/2022]
Abstract
Carbohydrate-active enzymes including glycosidases, transglycosidases, glycosyltransferases, polysaccharide lyases and carbohydrate esterases are responsible for the enzymatic processing of carbohydrates in plants. A number of carbohydrate-active enzymes are produced by microbial pathogens and insects responsible of severe crop losses. Plants have evolved proteinaceous inhibitors to modulate the activity of several of these enzymes. The continuing discovery of new inhibitors indicates that this research area is still unexplored and may lead to new exciting developments. To date, the role of the inhibitors is not completely understood. Here we review recent results obtained on the best characterised inhibitors, pointing to their possible biological role in vivo. Results recently obtained with plant transformation technology indicate that this class of inhibitors has potential biotechnological applications.
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Affiliation(s)
- Daniela Bellincampi
- Dipartimento di Biologia Vegetale, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.
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48
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Juge N, Payan F, Williamson G. XIP-I, a xylanase inhibitor protein from wheat: a novel protein function. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:203-11. [PMID: 14871661 DOI: 10.1016/j.bbapap.2003.08.014] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2003] [Accepted: 08/07/2003] [Indexed: 10/26/2022]
Abstract
Endo-(1,4)-beta-xylanases of plant and fungal origin play an important role in the degradation of arabinoxylans. Two distinct classes of proteinaceous endoxylanase inhibitors, the Triticum aestivum xylanase inhibitor (TAXI) and the xylanase inhibitor protein (XIP), have been identified in cereals. Engineering of proteins in conjunction with enzyme kinetics, thermodynamic, real-time interaction, and X-ray crystallographic studies has provided knowledge on the mechanism of inhibition of XIP-I towards endoxylanases. XIP-I is a 30 kDa protein which belongs to glycoside hydrolase family 18, and folds as a typical (beta/alpha)8 barrel. Although the inhibitor shows highest homology with plant chitinases, XIP-I does not hydrolyse chitin; probably due to structural differences in the XIP-I binding cleft. The inhibitor is specific for fungal xylanases from glycoside hydrolases families 10 and 11, but does not inhibit bacterial enzymes. The inhibition is competitive and, depending on the xylanase, the Ki value can be as low as 3.4 nM. Site-directed mutagenesis of a xylanase from Aspergillus niger suggested that the XIP-I binding site was the conserved hairpin loop "thumb" region of family 11 xylanases. Furthermore, XIP-I shows the ability to inhibit barley alpha-amylases of glycoside hydrolase family 13, providing the first example of a protein able to inhibit members of different glycoside hydrolase families (10, 11, and 13), and additionally a novel function for a protein of glycoside hydrolase family 18.
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Affiliation(s)
- Nathalie Juge
- Institute of Food Research, Norwich Research Park, Norwich, UK.
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49
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Santimone M, Koukiekolo R, Moreau Y, Le Berre V, Rougé P, Marchis-Mouren G, Desseaux V. Porcine pancreatic α-amylase inhibition by the kidney bean (Phaseolus vulgaris) inhibitor (α-AI1) and structural changes in the α-amylase inhibitor complex. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:181-90. [PMID: 14871659 DOI: 10.1016/j.bbapap.2003.11.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2003] [Accepted: 11/03/2003] [Indexed: 10/26/2022]
Abstract
Porcine pancreatic alpha-amylase (PPA) is inhibited by the red kidney bean (Phaseolus vulgaris) inhibitor alpha-AI1 [Eur. J. Biochem. 265 (1999) 20]. Inhibition kinetics were carried out using DP 4900-amylose and maltopentaose as substrate. As shown by graphical and statistical analysis of the kinetic data, the inhibitory mode is of the mixed noncompetitive type whatever the substrate thus involving the EI, EI2, ESI and ESI2 complexes. This contrast with the E2I complex obtained in the crystal and with biophysical studies. Such difference very likely depends on the [I]/[E] ratio. At low ratio, the E2I complex is favoured; at high ratio the EI, ESI and EI2 complexes are formed. The inhibition model also differs from those previously proposed for acarbose [Eur. J. Biochem. 241 (1996) 787 and Eur. J. Biochem. 252 (1998) 100]. In particular, with alpha-AI1, the inhibition takes place only when PPA and alpha-AI are preincubated together before adding the substrate. This indicates that the abortive PPA-alphaAI1 complex is formed during the preincubation period. One additional carbohydrate binding site is also demonstrated yielding the ESI complex. Also, a second protein binding site is found in EI2 and ESI2 abortive complexes. Conformational changes undergone by PPA upon alpha-AI1 binding are shown by higher sensitivity to subtilisin attack. From X-ray analysis of the alpha-AI1-PPA complex (E2I), the major interaction occurs with two hairpin loops L1 (residues 29-46) and L2 (residues 171-189) of alpha-AI1 protruding into the V-shaped active site of PPA. The hydrolysis of alpha-AI1 that accounts for the inhibitory activity is reported.
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Affiliation(s)
- Marius Santimone
- Institut Méditerranéen de Recherche en Nutrition (IMRN case 342), UMR INRA 1111, Faculté des Sciences et Techniques de St Jérôme, Université d'Aix-Marseille, Av Esc Normandie-Niemen, 13397 Marseilles cedex 20, France
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Svensson B, Fukuda K, Nielsen PK, Bønsager BC. Proteinaceous α-amylase inhibitors. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2004; 1696:145-56. [PMID: 14871655 DOI: 10.1016/j.bbapap.2003.07.004] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2003] [Accepted: 07/15/2003] [Indexed: 11/30/2022]
Abstract
Proteins that inhibit alpha-amylases have been isolated from plants and microorganisms. These inhibitors can have natural roles in the control of endogenous alpha-amylase activity or in defence against pathogens and pests; certain inhibitors are reported to be antinutritional factors. The alpha-amylase inhibitors belong to seven different protein structural families, most of which also contain evolutionary related proteins without inhibitory activity. Two families include bifunctional inhibitors acting both on alpha-amylases and proteases. High-resolution structures are available of target alpha-amylases in complex with inhibitors from five families. These structures indicate major diversity but also some similarity in the structural basis of alpha-amylase inhibition. Mutational analysis of the mechanism of inhibition was performed in a few cases and various protein engineering and biotechnological approaches have been outlined for exploitation of the inhibitory function.
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Affiliation(s)
- Birte Svensson
- Carlsberg Laboratory, Department of Chemistry, Gamle Carlsberg Vej 10, DK-2500 Copenhagen, Denmark.
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