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Schönauer R, Sierks D, Boerrigter M, Jawaid T, Caroff L, Audrezet MP, Friedrich A, Shaw M, Degenhardt J, Forberger M, de Fallois J, Bläker H, Bergmann C, Gödiker J, Schindler P, Schlevogt B, Müller RU, Berg T, Patterson I, Griffiths WJ, Sayer JA, Popp B, Torres VE, Hogan MC, Somlo S, Watnick TJ, Nevens F, Besse W, Cornec-Le Gall E, Harris PC, Drenth JPH, Halbritter J. Sex, Genotype, and Liver Volume Progression as Risk of Hospitalization Determinants in Autosomal Dominant Polycystic Liver Disease. Gastroenterology 2024; 166:902-914. [PMID: 38101549 DOI: 10.1053/j.gastro.2023.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/04/2023] [Accepted: 12/10/2023] [Indexed: 12/17/2023]
Abstract
BACKGROUND & AIMS Autosomal dominant polycystic liver disease is a rare condition with a female preponderance, based mainly on pathogenic variants in 2 genes, PRKCSH and SEC63. Clinically, autosomal dominant polycystic liver disease is characterized by vast heterogeneity, ranging from asymptomatic to highly symptomatic hepatomegaly. To date, little is known about the prediction of disease progression at early stages, hindering clinical management, genetic counseling, and the design of randomized controlled trials. To improve disease prognostication, we built a consortium of European and US centers to recruit the largest cohort of patients with PRKCSH and SEC63 liver disease. METHODS We analyzed an international multicenter cohort of 265 patients with autosomal dominant polycystic liver disease harboring pathogenic variants in PRKCSH or SEC63 for genotype-phenotype correlations, including normalized age-adjusted total liver volumes and polycystic liver disease-related hospitalization (liver event) as primary clinical end points. RESULTS Classifying individual total liver volumes into predefined progression groups yielded predictive risk discrimination for future liver events independent of sex and underlying genetic defects. In addition, disease severity, defined by age at first liver event, was considerably more pronounced in female patients and patients with PRKCSH variants than in those with SEC63 variants. A newly developed sex-gene score was effective in distinguishing mild, moderate, and severe disease, in addition to imaging-based prognostication. CONCLUSIONS Both imaging and clinical genetic scoring have the potential to inform patients about the risk of developing symptomatic disease throughout their lives. The combination of female sex, germline PRKCSH alteration, and rapid total liver volume progression is associated with the greatest odds of polycystic liver disease-related hospitalization.
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Affiliation(s)
- Ria Schönauer
- Department of Nephrology and Internal Intensive Care Medicine, Charité Universitätsmedizin Berlin (corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin), Berlin, Germany; Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Dana Sierks
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany; Department of Pediatric Surgery, Universitätsklinikum Leipzig, Leipzig, Germany
| | - Melissa Boerrigter
- Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Tabinda Jawaid
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota
| | - Lea Caroff
- University of Brest, Institut National de la Santé et de la Recherche Médicale, UMR 1078, Génétique, Génomique Fonctionnelle et Biotechnologies, Brest, France; Centre Hospitalier Universitaire Brest, Service de Néphrologie, Centre de Référence Maladies Rénales Héréditaires de l'Enfant et de l'Adulte, Brest, France
| | - Marie-Pierre Audrezet
- Centre Hospitalier Universitaire Brest, Service de Génétique Moléculaire, Brest, France
| | - Anja Friedrich
- Medizinische Genetik Mainz, Limbach Genetics, Mainz, Germany
| | - Melissa Shaw
- Departments of Internal Medicine and Nephrology, Yale University School of Medicine, New Haven, Connecticut
| | - Jan Degenhardt
- Department 2 of Internal Medicine, University of Cologne, Faculty of Medicine, University Hospital Cologne, Cologne, Germany
| | - Mirjam Forberger
- Department of Pathology, University of Leipzig Medical Center, Leipzig, Germany
| | - Jonathan de Fallois
- Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany
| | - Hendrik Bläker
- Department of Pathology, University of Leipzig Medical Center, Leipzig, Germany
| | | | - Juliana Gödiker
- Department of Internal Medicine B, University Hospital Münster, Münster, Germany
| | | | - Bernhard Schlevogt
- Department of Internal Medicine B, University Hospital Münster, Münster, Germany; Department of Gastroenterology, Medical Center Osnabrück, Osnabrück, Germany
| | - Roman-U Müller
- Department 2 of Internal Medicine, University of Cologne, Faculty of Medicine, University Hospital Cologne, Cologne, Germany; Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD) University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - Thomas Berg
- Division of Hepatology, Department of Medicine II, University of Leipzig Medical Center, Leipzig, Germany
| | - Ilse Patterson
- Department of Radiology, Cambridge University Hospitals, Cambridge, United Kingdom
| | - William J Griffiths
- Department of Hepatology, Cambridge Liver Unit, Cambridge University Hospitals, Cambridge, United Kingdom
| | - John A Sayer
- Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom; Renal Services, Newcastle upon Tyne National Health Service Foundation Trust, Newcastle upon Tyne, United Kingdom; National Institute for Health Research Newcastle Biomedical Research Centre, Newcastle upon Tyne, United Kingdom
| | - Bernt Popp
- Berlin Institute of Health at Charité, Universitätsmedizin Berlin, Center of Functional Genomics, Berlin, Germany
| | - Vicente E Torres
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota
| | - Marie C Hogan
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota
| | - Stefan Somlo
- Departments of Internal Medicine and Nephrology, Yale University School of Medicine, New Haven, Connecticut
| | - Terry J Watnick
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Frederik Nevens
- Department of Hepatology and Liver Transplantation Unit, University Hospitals Katholieke Universiteit Leuven, Leuven, Belgium
| | - Whitney Besse
- Departments of Internal Medicine and Nephrology, Yale University School of Medicine, New Haven, Connecticut
| | - Emilie Cornec-Le Gall
- University of Brest, Institut National de la Santé et de la Recherche Médicale, UMR 1078, Génétique, Génomique Fonctionnelle et Biotechnologies, Brest, France; Centre Hospitalier Universitaire Brest, Service de Néphrologie, Centre de Référence Maladies Rénales Héréditaires de l'Enfant et de l'Adulte, Brest, France
| | - Peter C Harris
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minnesota
| | - Joost P H Drenth
- Department of Gastroenterology and Hepatology, Radboud University Medical Center, Nijmegen, The Netherlands.
| | - Jan Halbritter
- Department of Nephrology and Internal Intensive Care Medicine, Charité Universitätsmedizin Berlin (corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin), Berlin, Germany; Division of Nephrology, Department of Internal Medicine, University of Leipzig Medical Center, Leipzig, Germany.
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Honma K, Sasaki H, Hamada N, Sharma A. An Extracytoplasmic Function Sigma/Anti-Sigma Factor System Regulates β-Glucanase Expression in Tannerella forsythia in Response to Fusobacterium nucleatum Sensing. J Bacteriol 2022; 204:e0031322. [PMID: 36448787 PMCID: PMC9765289 DOI: 10.1128/jb.00313-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/26/2022] [Indexed: 12/02/2022] Open
Abstract
The periodontal pathogen Tannerella forsythia expresses a β-glucanase (TfGlcA) whose expression is induced in response to Fusobacterium nucleatum, a bridge bacterium of the oral cavity. TfGlcA cleaves β-glucans to release glucose, which can serve as a carbon source for F. nucleatum and other cohabiting organisms. A two-gene cluster encoding a putative extracytoplasmic function (ECF) sigma factor and a FecR-like anti-sigma factor has been recognized upstream of a TfGlcA operon. We characterized and analyzed the role of these putative ECF sigma and anti-sigma factors in the regulation of TfGlcA expression. For this purpose, deletion mutants were constructed and analyzed for β-glucanase expression. In addition, an Escherichia coli-produced ECF sigma factor recombinant protein was evaluated for transcriptional and DNA binding activities. The results showed that the recombinant protein promoted transcription by the RNA polymerase core enzyme from the glcA promoter. Furthermore, in comparison to those in the parental strain, the β-glucanase expression levels were significantly reduced in the ECF sigma-factor deletion mutant and increased significantly in the FecR anti-sigma factor deletion mutant. The levels did not change in the mutants following coincubation with the F. nucleatum whole cells or cell extracts. Finally, the levels of β-glucanase produced by T. forsythia strains paralleled F. nucleatum biomass in cobiofilms. In conclusion, we identified a β-glucanase operon regulatory system in T. forsythia comprising an ECF sigma factor (TfSigG) and a cognate FecR-like anti-sigma factor responsive to F. nucleatum and potentially other stimuli. IMPORTANCE Previous studies have shown that F. nucleatum forms robust biofilms with T. forsythia utilizing glucose from the hydrolysis of β-glucans by T. forsythia β-glucanase, induced by F. nucleatum. In this study, we showed that a regulatory system comprising of an ECF sigma factor, TfSigG, and a FecR-like anti-sigma factor, TfFecR, is responsible for the β-glucanase induction in response to F. nucleatum, suggesting that this system plays roles in the mutualistic interactions of T. forsythia and F. nucleatum. The findings suggest the development and potential utility of small-molecule inhibitors targeting the β-glucanase activity or the TfSigG/TfFecR system as therapeutic drugs against dental plaque formation and periodontitis.
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Affiliation(s)
- Kiyonobu Honma
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
| | - Haruka Sasaki
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Ashu Sharma
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
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Weydert C, Decuypere JP, De Smedt H, Janssens P, Vennekens R, Mekahli D. Fundamental insights into autosomal dominant polycystic kidney disease from human-based cell models. Pediatr Nephrol 2019; 34:1697-1715. [PMID: 30215095 DOI: 10.1007/s00467-018-4057-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 07/23/2018] [Accepted: 08/13/2018] [Indexed: 12/17/2022]
Abstract
Several animal- and human-derived models are used in autosomal dominant polycystic kidney disease (ADPKD) research to gain insight in the disease mechanism. However, a consistent correlation between animal and human ADPKD models is lacking. Therefore, established human-derived models are relevant to affirm research results and translate findings into a clinical set-up. In this review, we give an extensive overview of the existing human-based cell models. We discuss their source (urine, nephrectomy and stem cell), immortalisation procedures, genetic engineering, kidney segmental origin and characterisation with nephron segment markers. We summarise the most studied pathways and lessons learned from these different ADPKD models. Finally, we issue recommendations for the derivation of human-derived cell lines and for experimental set-ups with these cell lines.
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Affiliation(s)
- Caroline Weydert
- PKD Research Group, Laboratory of Pediatrics, Department of Development and Regeneration, GPURE, KU Leuven, Leuven, Belgium
| | - Jean-Paul Decuypere
- PKD Research Group, Laboratory of Pediatrics, Department of Development and Regeneration, GPURE, KU Leuven, Leuven, Belgium
| | - Humbert De Smedt
- Laboratory of Molecular and Cellular Signaling, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Peter Janssens
- PKD Research Group, Laboratory of Pediatrics, Department of Development and Regeneration, GPURE, KU Leuven, Leuven, Belgium
- Department of Nephrology, University Hospitals Brussels, Brussels, Belgium
| | - Rudi Vennekens
- VIB Center for Brain and Disease Research, Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Djalila Mekahli
- PKD Research Group, Laboratory of Pediatrics, Department of Development and Regeneration, GPURE, KU Leuven, Leuven, Belgium.
- Department of Pediatric Nephrology, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium.
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Hamdani S, Wang H, Zheng G, Perveen S, Qu M, Khan N, Khan W, Jiang J, Li M, Liu X, Zhu X, Chu C, Zhu XG. Genome-wide association study identifies variation of glucosidase being linked to natural variation of the maximal quantum yield of photosystem II. Physiol Plant 2019; 166:105-119. [PMID: 30834537 DOI: 10.1111/ppl.12957] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 02/06/2019] [Accepted: 03/01/2019] [Indexed: 06/09/2023]
Abstract
The maximum quantum yield of photosystem II (as reflected by variable to maximum chlorophyll a fluorescence, Fv /Fm ) is regarded as one of the most important photosynthetic parameters. The genetic basis underlying natural variation in Fv /Fm , which shows low level of variations in plants under non-stress conditions, is not easy to be exploited using the conventional gene cloning approaches. Thus, in order to answer this question, we have followed another strategy: we used genome-wide association study (GWAS) and transgenic analysis in a rice mini-core collection. We report here that four single-nucleotide polymorphisms, located in the promoter region of β-glucosidase 5 (BGlu-5), are associated with observed variation in Fv /Fm . Indeed, our transgenic analysis showed a good correlation between BGlu-5 and Fv /Fm . Thus, our work demonstrates the feasibility of using GWAS to study natural variation in Fv /Fm , suggesting that cis-element polymorphism, affecting the BGlu-5 expression level, may, indirectly, contribute to Fv /Fm variation in rice through the gibberellin signaling pathway. Further research is needed to understand the mechanism of our novel observation.
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Affiliation(s)
- Saber Hamdani
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Hongru Wang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guangyong Zheng
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Shahnaz Perveen
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Mingnan Qu
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Naveed Khan
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Waqasuddin Khan
- Jamil-ur-Rahman Center for Genome Research, DR. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Jianjun Jiang
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Ming Li
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Xinyu Liu
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Xiaocen Zhu
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Chengcai Chu
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Xin-Guang Zhu
- Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, 200031, China
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5
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Abstract
Glycoside hydrolase family 9 (GH9) of carbohydrate-processing enzymes primarily consists of inverting endoglucanases. A subgroup of GH9 enzymes are believed to act as exo-glucosidases or exo-glucosaminidases, with many being found in organisms of the family Vibrionaceae, where they are proposed to function within the chitin-catabolism pathway. Here, it is shown that the GH9 enzyme from the pathogen Vibrio cholerae (hereafter referred to as VC0615) is active on both chitosan-derived and β-glucoside substrates. The structure of VC0615 at 3.17 Å resolution is reported from a crystal form with poor diffraction and lattice disorder. VC0615 was highly refractory to crystallization efforts, with crystals only appearing using a high protein concentration under conditions containing the precipitant poly-γ-glutamic acid (PGA). The structure is highly mobile within the crystal lattice, which is likely to reflect steric clashes between symmetry molecules which destabilize crystal packing. The overall tertiary structure of VC0615 is well resolved even at 3.17 Å resolution, which has allowed the structural basis for the exo-glucosidase/glucosaminidase activity of this enzyme to be investigated.
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Affiliation(s)
- Liang Wu
- York Structural Biology Laboratory, Department of Chemistry, The University of York, York YO10 5DD, England
| | - Gideon J. Davies
- York Structural Biology Laboratory, Department of Chemistry, The University of York, York YO10 5DD, England
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6
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Carrasco JA, Lucena-Padrós H, Brenes M, Ruiz-Barba JL. Expression of genes involved in metabolism of phenolic compounds by Lactobacillus pentosus and its relevance for table-olive fermentations. Food Microbiol 2018; 76:382-389. [PMID: 30166164 DOI: 10.1016/j.fm.2018.06.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 05/07/2018] [Accepted: 06/30/2018] [Indexed: 11/20/2022]
Abstract
Genes with the potential to code for enzymes involved in phenolic compound metabolism were detected in the genome of Lactobacillus pentosus IG1, isolated from a green olive fermentation. Based on homology, these genes could code for a 6-P-β Glucosidase, two different Tannases, a Gallate decarboxylase and a p-Coumaric decarboxylase. Expression of up to seven of these genes was studied in L. pentosus IG1 (olive fermentation) and CECT4023T (corn silage), including responses upon exposure to relevant phenolic compounds and different olive extracts. Genes potentially coding Tannase, Gallate decarboxylase and p-Coumaric acid decarboxylase significatively increased their expression upon exposure to such compounds and extracts, although it was strain dependent. In general, both the genetic organization and the characteristics of gene expression resembled very much those described for Lactobacillus plantarum. In accordance to the observed induced gene expression, metabolism of specific phenolic compounds was achieved by L. pentosus. Thus, methyl gallate, gallic acid and the hydroxycinamic acids p-coumaric, caffeic and ferulic were metabolized. In addition, the amount of phenolics such as tyrosol, oleuropein, rutin and verbascoside included in a minimal culture medium was noticeably reduced, again dependent on the strain considered.
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Affiliation(s)
- José Antonio Carrasco
- Departamento de Biotecnología de Alimentos, Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario, Edificio 46, Carretera de Utrera, Km 1, 41013 Sevilla, Spain.
| | - Helena Lucena-Padrós
- Departamento de Biotecnología de Alimentos, Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario, Edificio 46, Carretera de Utrera, Km 1, 41013 Sevilla, Spain.
| | - Manuel Brenes
- Departamento de Biotecnología de Alimentos, Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario, Edificio 46, Carretera de Utrera, Km 1, 41013 Sevilla, Spain.
| | - José Luis Ruiz-Barba
- Departamento de Biotecnología de Alimentos, Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario, Edificio 46, Carretera de Utrera, Km 1, 41013 Sevilla, Spain.
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Baiya S, Mahong B, Lee SK, Jeon JS, Ketudat Cairns JR. Demonstration of monolignol β-glucosidase activity of rice Os4BGlu14, Os4BGlu16 and Os4BGlu18 in Arabidopsis thaliana bglu45 mutant. Plant Physiol Biochem 2018; 127:223-230. [PMID: 29614441 DOI: 10.1016/j.plaphy.2018.03.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 03/22/2018] [Accepted: 03/23/2018] [Indexed: 06/08/2023]
Abstract
The glycoside hydrolase family 1 members Os4BGlu14, Os4BGlu16, and Os4BGlu18 were proposed to be rice monolignol β-glucosidases. In vitro studies demonstrated that the Os4BGlu16 and Os4BGlu18 hydrolyze the monolignol glucosides coniferin and syringin with high efficiency compared to other substrates. The replacement of the conserved catalytic acid/base glutamate residue by a nonionizable glutamine residue in Os4BGlu14 suggested that it may be inactive as a β-glucosidase. Here, we investigated the activities of Os4BGlu14, Os4BGlu16, and Os4BGlu18 in planta by recombinant expression of their genes in the Arabidopsis bglu45-2 (monolignol β-glucosidase) mutant and analysis of monolignol glucosides by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MSMS). The bglu45-2 line exhibits elevated monolignol glucoside levels, but lower amounts of coniferin, syringin, and p-coumaryl alcohol glucoside were seen in Arabidopsis bglu45-2 rescued lines complemented by the Os4BGlu14, Os4BGlu16, and Os4BGlu18 genes. These data suggest that the bglu45-2 mutant has a broader effect on monolignols than previously reported and that the Os4BGlu14, Os4BGlu16 and Os4BGlu18 proteins act as monolignol β-glucosidases to complement the defect. An OsBGlu16-GFP fusion protein localized to the cell wall. This apoplastic localization and the effect of these enzymes on monolignol glucoside levels suggest monolignol glucosides from the vacuole may meet the monolignol β-glucosidases, despite their different localization.
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Affiliation(s)
- Supaporn Baiya
- Faculty of Science at Sriracha, Kasetsart University, Sriracha Campus, Chonburi, 20230, Thailand; Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Bancha Mahong
- Graduate School of Biotechnology, Kyung-Hee University, Yongin, 17104, South Korea
| | - Sang-Kyu Lee
- Graduate School of Biotechnology, Kyung-Hee University, Yongin, 17104, South Korea
| | - Jong-Seong Jeon
- Graduate School of Biotechnology, Kyung-Hee University, Yongin, 17104, South Korea.
| | - James R Ketudat Cairns
- Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand; Laboratory of Biochemistry, Chulabhorn Research Institute, Bangkok, 10210, Thailand.
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Aguirre A, Eberhardt F, Hails G, Cerminati S, Castelli ME, Rasia RM, Paoletti L, Menzella HG, Peiru S. The production, properties, and applications of thermostable steryl glucosidases. World J Microbiol Biotechnol 2018; 34:40. [PMID: 29468428 DOI: 10.1007/s11274-018-2423-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 02/19/2018] [Indexed: 11/29/2022]
Abstract
Extremophilic microorganisms are a rich source of enzymes, the enzymes which can serve as industrial catalysts that can withstand harsh processing conditions. An example is thermostable β-glucosidases that are addressing a challenging problem in the biodiesel industry: removing steryl glucosides (SGs) from biodiesel. Steryl glucosidases (SGases) must be tolerant to heat and solvents in order to function efficiently in biodiesel. The amphipathic nature of SGs also requires enzymes with an affinity for water/solvent interfaces in order to achieve efficient hydrolysis. Additionally, the development of an enzymatic process involving a commodity such as soybean biodiesel must be cost-effective, necessitating an efficient manufacturing process for SGases. This review summarizes the identification of microbial SGases and their applications, discusses biodiesel refining processes and the development of analytical methods for identifying and quantifying SGs in foods and biodiesel, and considers technologies for strain engineering and process optimization for the heterologous production of a SGase from Thermococcus litoralis. All of these technologies might be used for the production of other thermostable enzymes. Structural features of SGases and the feasibility of protein engineering for novel applications are explored.
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Affiliation(s)
- Andres Aguirre
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
- Keclon S.A., Tucuman 7180, 2000, Rosario, Argentina
| | - Florencia Eberhardt
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
| | - Guillermo Hails
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
| | - Sebastian Cerminati
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
| | - María Eugenia Castelli
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
| | - Rodolfo M Rasia
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET-UNR), Area Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Ocampo y Esmeralda, predio CONICET, Rosario, 2000, Argentina
| | - Luciana Paoletti
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
| | - Hugo G Menzella
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina
- Keclon S.A., Tucuman 7180, 2000, Rosario, Argentina
| | - Salvador Peiru
- Instituto de Procesos Biotecnológicos y Químicos (IPROBYQ), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), CONICET, Suipacha 531, 2000, Rosario, Argentina.
- Keclon S.A., Tucuman 7180, 2000, Rosario, Argentina.
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Besse W, Dong K, Choi J, Punia S, Fedeles SV, Choi M, Gallagher AR, Huang EB, Gulati A, Knight J, Mane S, Tahvanainen E, Tahvanainen P, Sanna-Cherchi S, Lifton RP, Watnick T, Pei YP, Torres VE, Somlo S. Isolated polycystic liver disease genes define effectors of polycystin-1 function. J Clin Invest 2017; 127:1772-1785. [PMID: 28375157 DOI: 10.1172/jci90129] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 02/09/2017] [Indexed: 02/06/2023] Open
Abstract
Dominantly inherited isolated polycystic liver disease (PCLD) consists of liver cysts that are radiologically and pathologically identical to those seen in autosomal dominant polycystic kidney disease, but without clinically relevant kidney cysts. The causative genes are known for fewer than 40% of PCLD index cases. Here, we have used whole exome sequencing in a discovery cohort of 102 unrelated patients who were excluded for mutations in the 2 most common PCLD genes, PRKCSH and SEC63, to identify heterozygous loss-of-function mutations in 3 additional genes, ALG8, GANAB, and SEC61B. Similarly to PRKCSH and SEC63, these genes encode proteins that are integral to the protein biogenesis pathway in the endoplasmic reticulum. We inactivated these candidate genes in cell line models to show that loss of function of each results in defective maturation and trafficking of polycystin-1, the central determinant of cyst pathogenesis. Despite acting in a common pathway, each PCLD gene product demonstrated distinct effects on polycystin-1 biogenesis. We also found enrichment on a genome-wide basis of heterozygous mutations in the autosomal recessive polycystic kidney disease gene PKHD1, indicating that adult PKHD1 carriers can present with clinical PCLD. These findings define genetic and biochemical modulators of polycystin-1 function and provide a more complete definition of the spectrum of dominant human polycystic diseases.
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10
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Abstract
Glycosidic compounds are indispensable molecules in living systems. Biological phenomena such as cell wall formation, energy storage, and cell recognition strongly depend on the multi-functional characters of these substances. Development of highly regio- and stereoselective glycosylation reactions is necessary to provide sufficient amounts of specific compounds in basic research as well as for applications in industry. This review presents an overview of chemical and chemo-enzymatic glycosylations that have been developed during my forty-year academic career in the field of glyco-science. In the course of these studies, several new concepts such as "Direct Anomeric Activation", "Glyco-Process Chemistry" and "Glyco-Chemistry Cycles" have been established.
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Affiliation(s)
- Shin-ichiro SHODA
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
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11
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Sun J, Peebles CAM. Engineering overexpression of ORCA3 and strictosidine glucosidase in Catharanthus roseus hairy roots increases alkaloid production. Protoplasma 2016; 253:1255-64. [PMID: 26351111 DOI: 10.1007/s00709-015-0881-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 08/20/2015] [Indexed: 05/20/2023]
Abstract
Catharanthus roseus produces many pharmaceutically important terpenoid indole alkaloids (TIAs) such as vinblastine, vincristine, ajmalicine, and serpentine. Past metabolic engineering efforts have pointed to the tight regulation of the TIA pathway and to multiple rate-limiting reactions. Transcriptional regulator ORCA3 (octadecanoid responsive Catharanthus AP2-domain protein), activated by jasmonic acid, plays a central role in regulating the TIA pathway. In this study, overexpressing ORCA3 under the control of a glucocorticoid-inducible promoter in C. roseus hairy roots resulted in no change in the total amount of TIAs measured. RT-qPCR results showed that ORCA3 overexpression triggered the upregulation of transcripts of most of the known TIA pathway genes. One notable exception was the decrease in strictosidine glucosidase (SGD) transcripts. These results corresponded to previously published results. In this study, ORCA3 and SGD were both engineered in hairy roots under the control of a glucocorticoid-inducible promoter. Co-overexpression of ORCA3 and SGD resulted in a significant (p < 0.05) increase in serpentine by 44 %, ajmalicine by 32 %, catharanthine by 38 %, tabersonine by 40 %, lochnericine by 60 % and hörhammericine by 56 % . The total alkaloid pool was increased significantly by 47 %. Thus, combining overexpression of a positive regulator and a pathway gene which is not controlled by this regulator provided a way to enhance alkaloid production.
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Affiliation(s)
- Jiayi Sun
- Chemical and Biological Engineering Department, Colorado State University, Campus delivery 1301, Fort Collins, CO, 80523-1301, USA
| | - Christie A M Peebles
- Chemical and Biological Engineering Department, Colorado State University, Campus delivery 1301, Fort Collins, CO, 80523-1301, USA.
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12
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Nguyen TTH, Kim SB, Kim NM, Kang C, Chung B, Park JS, Kim D. Production of steviol from steviol glucosides using β-glycosidase from Sulfolobus solfataricus. Enzyme Microb Technol 2016; 93-94:157-165. [PMID: 27702476 DOI: 10.1016/j.enzmictec.2016.08.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/12/2016] [Accepted: 08/23/2016] [Indexed: 11/15/2022]
Abstract
Steviol is a diterpene isolated from the plant Stevia rebaudiana that has a potential role as an antihyperglycemic agent by stimulating insulin secretion from pancreatic beta cells and also has significant potential to diminish the renal clearance of anionic drugs and their metabolites. In this study, the lacS gene, which encodes a thermostable β-glycosidase (SSbgly) enzyme from the extremely thermoacidophillic archaeon Sulfolobus solfataricus, was cloned and expressed in E. coli Rossetta BL21(DE3)pLyS using lactose as an inducer. Through fermentation, SSbgly was expressed as a 61kDa protein with activity of 24.3U/mg and the OD600 of 23 was reached after 18h induction with 10mM lactose. Purified protein was obtained by Ni-Sepharose chromatography with a yield of 92.3%. SSbgly hydrolyzed steviol glycosides to produce steviol with a yield of 99.2%. The optimum conditions for steviol production were 50U/ml SSbgly and 90mg/ml Ste at 75°C as determined by the response surface method.
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Affiliation(s)
- Thi Thanh Hanh Nguyen
- Institute of Food Industrialization, Institutes of Green Bio Science & Technology, Seoul National University, Pyeongchang-gun, Gangwon-do, 25354, South Korea
| | - Seong-Bo Kim
- CJ CheilJedang, Life Ingredient & Material Research Institute, Suwon, 16495, South Korea
| | - Nahyun M Kim
- Section of Neurobiology, Department of Biological Sciences, University of Southern California, Los Angeles, CA, 90089, USA
| | - Choongil Kang
- OTTOGI Corporation, Anyang, Kyunggi, 06177, South Korea
| | | | - Jun-Seong Park
- Skin Research Institute, Amorepacific Corporation R&D Center, Yongin, 17074, South Korea
| | - Doman Kim
- Institute of Food Industrialization, Institutes of Green Bio Science & Technology, Seoul National University, Pyeongchang-gun, Gangwon-do, 25354, South Korea; Graduate School of International Agricultural Technology, Seoul National University, Pyeongchang-gun, Gangwon-do, 25354, South Korea.
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13
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Jing X, White TA, Luan J, Jiao C, Fei Z, Douglas AE. Evolutionary conservation of candidate osmoregulation genes in plant phloem sap-feeding insects. Insect Mol Biol 2016; 25:251-258. [PMID: 26896054 DOI: 10.1111/imb.12215] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The high osmotic pressure generated by sugars in plant phloem sap is reduced in phloem-feeding aphids by sugar transformations and facilitated water flux in the gut. The genes mediating these osmoregulatory functions have been identified and validated empirically in the pea aphid Acyrthosiphon pisum: sucrase 1 (SUC1), a sucrase in glycoside hydrolase family 13 (GH13), and aquaporin 1 (AQP1), a member of the Drosophila integral protein (DRIP) family of aquaporins. Here, we describe molecular analysis of GH13 and AQP genes in phloem-feeding representatives of the four phloem-feeding groups: aphids (Myzus persicae), coccids (Planococcus citri), psyllids (Diaphorina citri, Bactericera cockerelli) and whiteflies (Bemisia tabaci MEAM1 and MED). A single candidate GH13-SUC gene and DRIP-AQP gene were identified in the genome/transcriptome of most insects tested by the criteria of sequence motif and gene expression in the gut. Exceptionally, the psyllid Ba. cockerelli transcriptome included a gut-expressed Pyrocoelia rufa integral protein (PRIP)-AQP, but has no DRIP-AQP transcripts, suggesting that PRIP-AQP is recruited for osmoregulatory function in this insect. This study indicates that phylogenetically related SUC and AQP genes may generally mediate osmoregulatory functions in these diverse phloem-feeding insects, and provides candidate genes for empirical validation and development as targets for osmotic disruption of pest species.
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Affiliation(s)
- X Jing
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - T A White
- Lancaster Environment Centre, Lancaster University, Lancaster, UK
| | - J Luan
- Department of Entomology, Cornell University, Ithaca, NY, USA
| | - C Jiao
- Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY, USA
| | - Z Fei
- Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY, USA
| | - A E Douglas
- Department of Entomology, Cornell University, Ithaca, NY, USA
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
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14
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Fedeles SV, So JS, Shrikhande A, Lee SH, Gallagher AR, Barkauskas CE, Somlo S, Lee AH. Sec63 and Xbp1 regulate IRE1α activity and polycystic disease severity. J Clin Invest 2015; 125:1955-67. [PMID: 25844898 DOI: 10.1172/jci78863] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 02/19/2015] [Indexed: 12/14/2022] Open
Abstract
The HSP40 cochaperone SEC63 is associated with the SEC61 translocon complex in the ER. Mutations in the gene encoding SEC63 cause polycystic liver disease in humans; however, it is not clear how altered SEC63 influences disease manifestations. In mice, loss of SEC63 induces cyst formation both in liver and kidney as the result of reduced polycystin-1 (PC1). Here we report that inactivation of SEC63 induces an unfolded protein response (UPR) pathway that is protective against cyst formation. Specifically, using murine genetic models, we determined that SEC63 deficiency selectively activates the IRE1α-XBP1 branch of UPR and that SEC63 exists in a complex with PC1. Concomitant inactivation of both SEC63 and XBP1 exacerbated the polycystic kidney phenotype in mice by markedly suppressing cleavage at the G protein-coupled receptor proteolysis site (GPS) in PC1. Enforced expression of spliced XBP1 (XBP1s) enhanced GPS cleavage of PC1 in SEC63-deficient cells, and XBP1 overexpression in vivo ameliorated cystic disease in a murine model with reduced PC1 function that is unrelated to SEC63 inactivation. Collectively, the findings show that SEC63 function regulates IRE1α/XBP1 activation, SEC63 and XBP1 are required for GPS cleavage and maturation of PC1, and activation of XBP1 can protect against polycystic disease in the setting of impaired biogenesis of PC1.
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MESH Headings
- Animals
- Cell Line
- DNA Helicases/deficiency
- DNA Helicases/genetics
- DNA Helicases/physiology
- DNA-Binding Proteins/deficiency
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/physiology
- Disease Models, Animal
- Endoribonucleases/metabolism
- Female
- Glucosidases/deficiency
- Glucosidases/genetics
- Intracellular Signaling Peptides and Proteins/deficiency
- Intracellular Signaling Peptides and Proteins/genetics
- Kidney/metabolism
- Kidney/pathology
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Molecular Chaperones
- Polycystic Kidney, Autosomal Dominant/genetics
- Polycystic Kidney, Autosomal Dominant/metabolism
- Polycystic Kidney, Autosomal Recessive/genetics
- Polycystic Kidney, Autosomal Recessive/metabolism
- Protein Serine-Threonine Kinases/metabolism
- Protein Structure, Tertiary
- RNA Splicing
- RNA, Small Interfering/genetics
- RNA-Binding Proteins
- Receptors, G-Protein-Coupled/metabolism
- Recombinant Fusion Proteins/metabolism
- Regulatory Factor X Transcription Factors
- TRPP Cation Channels/biosynthesis
- TRPP Cation Channels/deficiency
- TRPP Cation Channels/genetics
- Transcription Factors/deficiency
- Transcription Factors/genetics
- Transcription Factors/physiology
- Transfection
- Unfolded Protein Response/physiology
- X-Box Binding Protein 1
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15
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Tamaki FK, Pimentel AC, Dias AB, Cardoso C, Ribeiro AF, Ferreira C, Terra WR. Physiology of digestion and the molecular characterization of the major digestive enzymes from Periplaneta americana. J Insect Physiol 2014; 70:22-35. [PMID: 25193546 DOI: 10.1016/j.jinsphys.2014.08.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 08/22/2014] [Accepted: 08/23/2014] [Indexed: 06/03/2023]
Abstract
Cockroaches are among the first insects to appear in the fossil record. This work is part of ongoing research on insects at critical points in the evolutionary tree to disclose evolutionary trends in the digestive characteristics of insects. A transcriptome (454 Roche platform) of the midgut of Periplanetaamericana was searched for sequences of digestive enzymes. The selected sequences were manually curated. The complete or nearly complete sequences showing all characteristic motifs and highly expressed (reads counting) had their predicted sequences checked by cloning and Sanger sequencing. There are two chitinases (lacking mucin and chitin-binding domains), one amylase, two α- and three β-glucosidases, one β-galactosidase, two aminopeptidases (none of the N-group), one chymotrypsin, 5 trypsins, and none β-glucanase. Electrophoretic and enzymological data agreed with transcriptome data in showing that there is a single β-galactosidase, two α-glucosidases, one preferring as substrate maltase and the other aryl α-glucoside, and two β-glucosidases. Chromatographic and enzymological data identified 4 trypsins, one chymotrypsin (also found in the transcriptome), and one non-identified proteinase. The major digestive trypsin is identifiable to a major P. americana allergen (Per a 10). The lack of β-glucanase expression in midguts was confirmed, thus lending support to claims that those enzymes are salivary. A salivary amylase was molecularly cloned and shown to be different from the one from the midgut. Enzyme distribution showed that most digestion occurs under the action of salivary and midgut enzymes in the foregut and anterior midgut, except the posterior terminal digestion of proteins. A counter-flux of fluid may be functional in the midgut of the cockroach to explain the low excretory rate of digestive enzymes. Ultrastructural and immunocytochemical localization data showed that amylase and trypsin are released by both merocrine and apocrine secretion mainly from gastric caeca. Finally, a discussion on Polyneoptera digestive physiology is provided.
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Affiliation(s)
- Fábio K Tamaki
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil
| | - André C Pimentel
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil
| | - Alcides B Dias
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil
| | - Christiane Cardoso
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil
| | - Alberto F Ribeiro
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, C.P. 11461, 05513-970 São Paulo, Brazil
| | - Clélia Ferreira
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil
| | - Walter R Terra
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, C.P. 26077, 05513-970 São Paulo, Brazil.
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16
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Pougach K, Voet A, Kondrashov FA, Voordeckers K, Christiaens JF, Baying B, Benes V, Sakai R, Aerts J, Zhu B, Van Dijck P, Verstrepen KJ. Duplication of a promiscuous transcription factor drives the emergence of a new regulatory network. Nat Commun 2014; 5:4868. [PMID: 25204769 PMCID: PMC4172970 DOI: 10.1038/ncomms5868] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 07/31/2014] [Indexed: 11/08/2022] Open
Abstract
The emergence of new genes throughout evolution requires rewiring and extension of regulatory networks. However, the molecular details of how the transcriptional regulation of new gene copies evolves remain largely unexplored. Here we show how duplication of a transcription factor gene allowed the emergence of two independent regulatory circuits. Interestingly, the ancestral transcription factor was promiscuous and could bind different motifs in its target promoters. After duplication, one paralogue evolved increased binding specificity so that it only binds one type of motif, whereas the other copy evolved a decreased activity so that it only activates promoters that contain multiple binding sites. Interestingly, only a few mutations in both the DNA-binding domains and in the promoter binding sites were required to gradually disentangle the two networks. These results reveal how duplication of a promiscuous transcription factor followed by concerted cis and trans mutations allows expansion of a regulatory network.
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Affiliation(s)
- Ksenia Pougach
- Laboratory for Genetics and Genomics, Department M2S, Centre of Microbial and Plant Genetics (CMPG), KU Leuven, B-3001 Leuven, Belgium
- Laboratory for Systems biology, Vlaams Instituut voor Biotechnologie (VIB), B-3001 Leuven, Belgium
| | - Arnout Voet
- Structural Bioinformatics, Center for Life Science Technologies (CLST), RIKEN, 230-0045 Yokohama, Japan
| | - Fyodor A. Kondrashov
- Laboratory of Evolutionary Genomics, Centre for genomic regulation (CRG), 08003 Barcelona, Spain
| | - Karin Voordeckers
- Laboratory for Genetics and Genomics, Department M2S, Centre of Microbial and Plant Genetics (CMPG), KU Leuven, B-3001 Leuven, Belgium
- Laboratory for Systems biology, Vlaams Instituut voor Biotechnologie (VIB), B-3001 Leuven, Belgium
| | - Joaquin F. Christiaens
- Laboratory for Genetics and Genomics, Department M2S, Centre of Microbial and Plant Genetics (CMPG), KU Leuven, B-3001 Leuven, Belgium
- Laboratory for Systems biology, Vlaams Instituut voor Biotechnologie (VIB), B-3001 Leuven, Belgium
| | - Bianka Baying
- Genomics Core Facility, European Molecular Biology Laboratory Heidelberg (EMBL), 69117 Heidelberg, Germany
| | - Vladimir Benes
- Genomics Core Facility, European Molecular Biology Laboratory Heidelberg (EMBL), 69117 Heidelberg, Germany
| | - Ryo Sakai
- Department of Electrical Engineering, STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven, B-3001 Leuven, Belgium
- iMinds Medical Information Technologies Department, KU Leuven, B-3001 Leuven, Belgium
| | - Jan Aerts
- Department of Electrical Engineering, STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven, B-3001 Leuven, Belgium
- iMinds Medical Information Technologies Department, KU Leuven, B-3001 Leuven, Belgium
| | - Bo Zhu
- Laboratory for Genetics and Genomics, Department M2S, Centre of Microbial and Plant Genetics (CMPG), KU Leuven, B-3001 Leuven, Belgium
- Laboratory for Systems biology, Vlaams Instituut voor Biotechnologie (VIB), B-3001 Leuven, Belgium
| | - Patrick Van Dijck
- Molecular Microbiology and Biotechnology Section, KU Leuven, B-3001 Leuven, Belgium
- Department of Molecular Microbiology, VIB, B-3001 Leuven, Belgium
| | - Kevin J. Verstrepen
- Laboratory for Genetics and Genomics, Department M2S, Centre of Microbial and Plant Genetics (CMPG), KU Leuven, B-3001 Leuven, Belgium
- Laboratory for Systems biology, Vlaams Instituut voor Biotechnologie (VIB), B-3001 Leuven, Belgium
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17
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Mo C, Yang Y, Chen N, Yang X, Tian S. [Display cellulolytic enzymes on Saccharomyces cerevisiae cell surface by using Flo1p as an anchor protein for cellulosic ethanol production]. Sheng Wu Gong Cheng Xue Bao 2014; 30:1401-1413. [PMID: 25720155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this study, we constructed a yeast consortium surface-display expression system by using Flo1 as an anchor protein. Endoglucanase II (EGII) and cellobiohydrolase II (CBHII) from Trichoderma reesei, and β3-glucosidase 1 (BGLI) from Aspergillus aculeatus were immobilized on Saccharomyces cerevisiae Y5. We constructed the cellulose-displaying expression yeast consortium (Y5/fEGII:Y5/fCBHII:Y5/fBGLI = 1:1:1) and investigated the enzymatic ability and ethanol fermentation. The displayed cellulolytic enzymes was stabile during the 96-h fermentation. The yeast consortium produced 0.77 g/L ethanol from 10 g/L phosphoric acid swollen cellulose (PASC) within 96 h. The yield (in grams of ethanol produced per gram of carbohydrate consumed) was 0.35 g/g, which correspond to 68.6% of the theoretical yield.
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18
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Abstract
Aspergillus nidulans possessed 16 putative amylolytic genes consisting of 7 alpha-glucosidase (agdA-F), 7 alpha-amylase (amyA-F), and 2 glucoamylase (glaA and B) genes on the genome. Among them, the agdA, agdB, agdE, agdF, amyA, amyB, amyF, and glaB genes were induced by isomaltose. AmyR, a Zn(II)(2)Cys(6) transcription factor, was required for the induction. The isomaltose-inducible genes possessed at least one consensus sequence for AmyR binding, 5'-CGGN(8)CGG, on each promoter region. None of the amylolytic genes was induced by maltose. The mRNA levels of the amylolytic genes except for agdC, amyD, and amyG increased under carbon-starved conditions. Release from CreA-dependent carbon catabolite repression was the main cause of the increase, but, the mRNA levels of agdB, agdF, amyB, amyF, and glaB increased to some extent even in a creA mutant. Therefore, both CreA-dependent and -independent mechanisms are involved in the up-regulation of the amylolytic genes under carbon-starved conditions.
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Affiliation(s)
- Takashi Nakamura
- Department of Biological Mechanisms and Functions, Graduate School of Bioagricultural Sciences, Nagoya University, Japan
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19
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Shin GC, Ahn SH, Choi HS, Kim J, Park ES, Kim DH, Kim KH. Hepatocystin contributes to interferon-mediated antiviral response to hepatitis B virus by regulating hepatocyte nuclear factor 4α. Biochim Biophys Acta Mol Basis Dis 2014; 1842:1648-57. [PMID: 24769044 DOI: 10.1016/j.bbadis.2014.04.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 04/06/2014] [Accepted: 04/13/2014] [Indexed: 02/07/2023]
Abstract
Hepatocystin/80K-H is known as a causative gene for autosomal dominant polycystic liver disease. However, the role of hepatocystin in hepatitis B virus-related liver disease remains unknown. Here, we investigated the role of hepatocystin on the cytokine-mediated antiviral response against hepatitis B virus infection. We investigated the antiviral effect and mechanism of hepatocystin by ectopic expression and RNAi knockdown in cell culture and mouse livers. Hepatocystin suppressed the replication of hepatitis B virus both in vitro and in vivo. This inhibitory effect was HBx-independent and mediated by the transcriptional regulation of viral genome via the activation of exogenous signal-regulated kinase 1/2 and the reduced expression of hepatocyte nuclear factor 4α, a transcription factor essential for hepatitis B virus replication. The amino-terminal region of hepatocystin was essential for regulation of this antiviral signaling pathway. We also found that hepatocystin acts as a critical component in interferon-mediated mitogen-activated protein kinase signaling pathway, and the interferon-induced antiviral activity against hepatitis B virus is associated with the expression levels of hepatocystin. We demonstrated that hepatocystin plays a critical role in modulating the susceptibility of hepatitis B virus to interferon, suggesting that the modulation of hepatocystin expression is important for cytokine-mediated viral clearance during hepatitis B virus infection.
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Affiliation(s)
- Gu-Choul Shin
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea; Institute of Functional Genomics, Konkuk University, Seoul, Republic of Korea
| | - Sung Hyun Ahn
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea
| | - Hyo-Sun Choi
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea
| | - Jingyeong Kim
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea
| | - Eun-Sook Park
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea
| | - Doo Hyun Kim
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea
| | - Kyun-Hwan Kim
- Department of Pharmacology and Center for Cancer Research and Diagnostic Medicine, IBST, School of Medicine, Konkuk University, Seoul, Republic of Korea; Institute of Functional Genomics, Konkuk University, Seoul, Republic of Korea; Research Institute of Medical Sciences, Konkuk University, Seoul, Republic of Korea.
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20
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Fernández-Álvarez A, Elías-Villalobos A, Jiménez-Martín A, Marín-Menguiano M, Ibeas JI. Endoplasmic reticulum glucosidases and protein quality control factors cooperate to establish biotrophy in Ustilago maydis. Plant Cell 2013; 25:4676-90. [PMID: 24280385 PMCID: PMC3875743 DOI: 10.1105/tpc.113.115691] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 10/04/2013] [Accepted: 11/04/2013] [Indexed: 05/21/2023]
Abstract
Secreted fungal effectors mediate plant-fungus pathogenic interactions. These proteins are typically N-glycosylated, a common posttranslational modification affecting their location and function. N-glycosylation consists of the addition, and subsequent maturation, of an oligosaccharide core in the endoplasmic reticulum (ER) and Golgi apparatus. In this article, we show that two enzymes catalyzing specific stages of this pathway in maize smut (Ustilago maydis), glucosidase I (Gls1) and glucosidase II β-subunit (Gas2), are essential for its pathogenic interaction with maize (Zea mays). Gls1 is required for the initial stages of infection following appressorium penetration, and Gas2 is required for efficient fungal spreading inside infected tissues. While U. maydis Δgls1 cells induce strong plant defense responses, Δgas2 hyphae are able to repress them, showing that slight differences in the N-glycoprotein processing can determine the extent of plant-fungus interactions. Interestingly, the calnexin protein, a central element of the ER quality control system for N-glycoproteins in eukaryotic cells, is essential for avoiding plant defense responses in cells with defective N-glycoproteins processing. Thus, N-glycoprotein maturation and this conserved checkpoint appear to play an important role in the establishment of an initial biotrophic state with the plant, which allows subsequent colonization.
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Kuznetsov E, Kučerová H, Váchová L, Palková Z. SUN family proteins Sun4p, Uth1p and Sim1p are secreted from Saccharomyces cerevisiae and produced dependently on oxygen level. PLoS One 2013; 8:e73882. [PMID: 24040106 PMCID: PMC3770667 DOI: 10.1371/journal.pone.0073882] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 07/24/2013] [Indexed: 11/19/2022] Open
Abstract
The SUN family is comprised of proteins that are conserved among various yeasts and fungi, but that are absent in mammals and plants. Although the function(s) of these proteins are mostly unknown, they have been linked to various, often unrelated cellular processes such as those connected to mitochondrial and cell wall functions. Here we show that three of the four Saccharomyces cerevisiae SUN family proteins, Uth1p, Sim1p and Sun4p, are efficiently secreted out of the cells in different growth phases and their production is affected by the level of oxygen. The Uth1p, Sim1p, Sun4p and Nca3p are mostly synthesized during the growth phase of both yeast liquid cultures and colonies. Culture transition to slow-growing or stationary phases is linked with a decreased cellular concentration of Sim1p and Sun4p and with their efficient release from the cells. In contrast, Uth1p is released mainly from growing cells. The synthesis of Uth1p and Sim1p, but not of Sun4p, is repressed by anoxia. All four proteins confer cell sensitivity to zymolyase. In addition, Uth1p affects cell sensitivity to compounds influencing cell wall composition and integrity (such as Calcofluor white and Congo red) differently when growing on fermentative versus respiratory carbon sources. In contrast, Uth1p is essential for cell resistance to boric acids irrespective of carbon source. In summary, our novel findings support the hypothesis that SUN family proteins are involved in the remodeling of the yeast cell wall during the various phases of yeast culture development and under various environmental conditions. The finding that Uth1p is involved in cell sensitivity to boric acid, i.e. to a compound that is commonly used as an important antifungal in mycoses, opens up new possibilities of investigating the mechanisms of boric acid's action.
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Affiliation(s)
- Evgeny Kuznetsov
- Department of Genetics and Microbiology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Helena Kučerová
- Department of Genetics and Microbiology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
- Institute of Microbiology of the ASCR, v.v.i., Prague, Czech Republic
| | - Libuše Váchová
- Department of Genetics and Microbiology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
- Institute of Microbiology of the ASCR, v.v.i., Prague, Czech Republic
| | - Zdena Palková
- Department of Genetics and Microbiology, Faculty of Science, Charles University in Prague, Prague, Czech Republic
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Fu CW, Wang YP, Fang TY, Lin TH. Interaction between trehalose and MTHase from Sulfolobus solfataricus studied by theoretical computation and site-directed mutagenesis. PLoS One 2013; 8:e68565. [PMID: 23894317 PMCID: PMC3716775 DOI: 10.1371/journal.pone.0068565] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Accepted: 05/30/2013] [Indexed: 11/18/2022] Open
Abstract
Maltooligosyltrehalose trehalohydrolase (MTHase) catalyzes the release of trehalose by cleaving the α-1,4-glucosidic linkage next to the α-1,1-linked terminal disaccharide of maltooligosyltrehalose. Computer simulation using the hydrogen bond analysis, free energy decomposition, and computational alanine scanning were employed to investigate the interaction between maltooligosyltrehalose and the enzyme. The same residues that were chosen for theoretical investigation were also studied by site-directed mutagenesis and enzyme kinetic analysis. The importance of residues determined either experimentally or computed theoretically were in good accord with each other. It was found that residues Y155, D156, and W218 of subsites -2 and -3 of the enzyme might play an important role in interacting with the ligand. The theoretically constructed structure of the enzyme-ligand complex was further validated through an ab initio quantum chemical calculation using the Gaussian09 package. The activation energy computed from this latter study was very similar to those reported in literatures for the same type of hydrolysis reactions.
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Affiliation(s)
- Chien-wei Fu
- Institute of Molecular Medicine and Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan
| | - Yu-Ping Wang
- Department of Food Science and Center of Excellence for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan
| | - Tsuei-Yun Fang
- Department of Food Science and Center of Excellence for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung, Taiwan
- * E-mail: (THL); (TYF)
| | - Thy-Hou Lin
- Institute of Molecular Medicine and Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan
- * E-mail: (THL); (TYF)
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Sánchez-Cañizares C, Palacios J. Construction of a marker system for the evaluation of competitiveness for legume nodulation in Rhizobium strains. J Microbiol Methods 2013; 92:246-9. [PMID: 23305927 DOI: 10.1016/j.mimet.2012.12.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 12/21/2012] [Accepted: 12/21/2012] [Indexed: 11/21/2022]
Abstract
A marker system has been set up for the analysis of competitiveness of Rhizobium leguminosarum strains for legume nodulation. The strains generated incorporate gusA and celB marker genes at identical positions and allow efficient scoring of single and double infections. Based on this system, we have found that strain UPM791 outcompetes 3841 for nodulation in pea. This technique will be useful to determine the effect of different traits on competitiveness.
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Affiliation(s)
- Carmen Sánchez-Cañizares
- Centro de Biotecnología y Genómica de Plantas (C.B.G.P.), and Departamento de Biotecnología, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, Carretera M40-km 37.7, 28223 Pozuelo de Alarcón, Madrid, Spain
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Michalska K, Tan K, Li H, Hatzos-Skintges C, Bearden J, Babnigg G, Joachimiak A. GH1-family 6-P-β-glucosidases from human microbiome lactic acid bacteria. Acta Crystallogr D Biol Crystallogr 2013; 69:451-63. [PMID: 23519420 PMCID: PMC3605045 DOI: 10.1107/s0907444912049608] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 12/03/2012] [Indexed: 11/11/2022]
Abstract
In lactic acid bacteria and other bacteria, carbohydrate uptake is mostly governed by phosphoenolpyruvate-dependent phosphotransferase systems (PTSs). PTS-dependent translocation through the cell membrane is coupled with phosphorylation of the incoming sugar. After translocation through the bacterial membrane, the β-glycosidic bond in 6'-P-β-glucoside is cleaved, releasing 6-P-β-glucose and the respective aglycon. This reaction is catalyzed by 6-P-β-glucosidases, which belong to two glycoside hydrolase (GH) families: GH1 and GH4. Here, the high-resolution crystal structures of GH1 6-P-β-glucosidases from Lactobacillus plantarum (LpPbg1) and Streptococcus mutans (SmBgl) and their complexes with ligands are reported. Both enzymes show hydrolytic activity towards 6'-P-β-glucosides. The LpPbg1 structure has been determined in an apo form as well as in a complex with phosphate and a glucose molecule corresponding to the aglycon molecule. The S. mutans homolog contains a sulfate ion in the phosphate-dedicated subcavity. SmBgl was also crystallized in the presence of the reaction product 6-P-β-glucose. For a mutated variant of the S. mutans enzyme (E375Q), the structure of a 6'-P-salicin complex has also been determined. The presence of natural ligands enabled the definition of the structural elements that are responsible for substrate recognition during catalysis.
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Affiliation(s)
- Karolina Michalska
- Midwest Center for Structural Genomics, Biosciences Division, Argonne National Laboratory, Argonne, Illinois, USA
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Abstract
Polycystic liver diseases (PCLDs) are a heterogeneous group of genetic disorders characterized by the development of multiple fluid-filled cysts in the liver, which derive from cholangiocytes, the epithelial cells lining the bile ducts. When these cysts grow, symptoms such as abdominal distension, nausea, and abdominal pain may occur. PCLDs may exist isolated (i.e., autosomal dominant polycystic liver disease, ADPLD) or in combination with renal cystogenesis (i.e., autosomal dominant polycystic kidney disease and autosomal recessive polycystic liver disease). The exact prevalence of PCLDs is unknown, but is estimated to occur in approximately 1:1000 persons. Although the pathogenesis of each form of PCLD appears to be different, increasing evidences indicate that hepatic cystogenesis is a phenomenon that may involve somatic loss of heterozygosity (LOH) in those pathological conditions inherited in a dominant form. A recent report, using highly sophisticated methodology, demonstrated that ADPLD patients with a germline mutation in the protein kinase C substrate 80K-H (PRKCSH) gene mostly develop hepatic cystogenesis through a second somatic mutation. While hepatocystin, the PRKCSH-encoding protein, was absent in the hepatic cysts with LOH, it was still expressed in the heterozygous cysts. On the other hand, no additional trans-heterozygous mutations on the SEC63 homolog (S. cerevisiae/SEC63) gene (also involved in the development of PCLDs) were observed. These data indicate that PCLD is recessive at the cellular level, and point out the important role of hepatocystin loss in cystogenesis. In this commentary, we discuss the knowledge regarding the role of somatic second-hit mutations in the development of PCLDs, and the most relevant findings have been highlighted.
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Zingg-Schenk A, Caduff J, Azzarello-Burri S, Bergmann C, Drenth JPH, Neuhaus TJ. Boy with autosomal recessive polycystic kidney and autosomal dominant polycystic liver disease. Pediatr Nephrol 2012; 27:1197-200. [PMID: 22415584 DOI: 10.1007/s00467-012-2137-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2011] [Revised: 02/08/2012] [Accepted: 02/10/2012] [Indexed: 11/27/2022]
Abstract
BACKGROUND Autosomal recessive polycystic kidney disease (ARPKD) shows a great phenotypic variability between patients, ranging from perinatal demise to mildly affected adults. Autosomal dominant polycystic liver disease (PCLD) does not manifest in childhood. CASE-DIAGNOSIS/TREATMENT A boy was reported with the co-occurrence of ARPKD and PCLD. He presented at the age of 16 days with pyelonephritis and urosepsis. Subsequent investigations showed enlarged kidneys and hyperechogenic renal medulla and liver parenchyma. Genetic analysis revealed compound heterozygous mutations in the PKHD1 gene (p.Arg496X and p.Ser1862Leu). After his mother was diagnosed with PCLD, the finding of a liver cyst on ultrasound prompted analysis of the PRKCSH gene, revealing a missense mutation (p.Arg139His). At the most recent follow-up at 13 years of age, the patient's course and clinical examination was uneventful with normal renal and liver function without evidence of portal hypertension. CONCLUSIONS The patient with ARPKD and PCLD has so far demonstrated a benign clinical outcome, consistent with the great phenotypic variability of ARPKD and, apart from the liver cyst, asymptomatic manifestation of PCLD in childhood. However, close long-term follow-up is mandatory.
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Sue M, Nakamura C, Nomura T. Dispersed benzoxazinone gene cluster: molecular characterization and chromosomal localization of glucosyltransferase and glucosidase genes in wheat and rye. Plant Physiol 2011; 157:985-97. [PMID: 21875895 PMCID: PMC3252142 DOI: 10.1104/pp.111.182378] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Benzoxazinones (Bxs) are major defensive secondary metabolites in wheat (Triticum aestivum), rye (Secale cereale), and maize (Zea mays). Here, we identified full sets of homeologous and paralogous genes encoding Bx glucosyltransferase (GT) and Bx-glucoside glucosidase (Glu) in hexaploid wheat (2n = 6x = 42; AABBDD). Four GT loci (TaGTa-TaGTd) were mapped on chromosomes 7A, 7B (two loci), and 7D, whereas four glu1 loci (Taglu1a-Taglu1d) were on chromosomes 2A, 2B (two loci), and 2D. Transcript levels differed greatly among the four loci; B-genome loci of both TaGT and Taglu1 genes were preferentially transcribed. Catalytic properties of the enzyme encoded by each homeolog/paralog also differed despite high levels of identity among amino acid sequences. The predominant contribution of the B genome to GT and Glu reactions was revealed, as observed previously for the five Bx biosynthetic genes, TaBx1 to TaBx5, which are separately located on homeologous groups 4 and 5 chromosomes. In rye, where the ScBx1 to ScBx5 genes are dispersed to chromosomes 7R and 5R, ScGT and Scglu were located separately on chromosomes 4R and 2R, respectively. The dispersal of Bx-pathway loci to four distinct chromosomes in hexaploid wheat and rye suggests that the clustering of Bx-pathway genes, as found in maize, is not essential for coordinated transcription. On the other hand, barley (Hordeum vulgare) was found to lack the orthologous GT and glu loci like the Bx1 to Bx5 loci despite its close phylogenetic relationship with wheat and rye. These results contribute to our understanding of the evolutionary processes that the Bx-pathway loci have undergone in grasses.
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Palmirotta R, Guadagni F, Savonarola A, Ludovici G, De Marchis ML, Palli D, Falchetti M, Ottini L. PRKCSH GAG trinucleotide repeat is a mutational target in gastric carcinomas with high-level microsatellite instability. Clin Genet 2011; 79:397-8; author reply 399-400. [PMID: 21371016 DOI: 10.1111/j.1399-0004.2010.01536.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Hermosa R, Botella L, Keck E, Jiménez JÁ, Montero-Barrientos M, Arbona V, Gómez-Cadenas A, Monte E, Nicolás C. The overexpression in Arabidopsis thaliana of a Trichoderma harzianum gene that modulates glucosidase activity, and enhances tolerance to salt and osmotic stresses. J Plant Physiol 2011; 168:1295-1302. [PMID: 21466906 DOI: 10.1016/j.jplph.2011.01.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Revised: 12/21/2010] [Accepted: 01/10/2011] [Indexed: 05/30/2023]
Abstract
Using the TrichoEST database, generated in a previous functional genomics project from the beneficial filamentous fungus Trichoderma harzianum, a gene named Thkel1, which codes for a putative kelch-repeat protein, was isolated and characterized. Silencing of this gene in T. harzianum leads to a reduction of glucosidase activity and mycelial growth under abiotic stress conditions. Expression of this gene in Arabidopsis enhances plant tolerance to salt and osmotic stresses, accompanied by an increase in glucosidase activity and a reduction of abscisic acid levels compared to those observed in wild-type plants. Data presented throughout this article suggest the high value of T. harzianum as a source of genes able to facilitate the achievement of producing plants resistant to abiotic stresses without alteration of their phenotype.
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Affiliation(s)
- Rosa Hermosa
- Departamento de Microbiología y Genética, Centro Hispano-Luso de Investigaciones Agrarias (CIALE), Facultad de Farmacia, Universidad de Salamanca, C/Río Duero 12, Campus de Villamayor, 37185 Salamanca, Spain
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Hermosa R, Botella L, Keck E, Jiménez JÁ, Montero-Barrientos M, Arbona V, Gómez-Cadenas A, Monte E, Nicolás C. The overexpression in Arabidopsis thaliana of a Trichoderma harzianum gene that modulates glucosidase activity, and enhances tolerance to salt and osmotic stresses. J Plant Physiol 2011. [PMID: 21466906 DOI: 10.1016/jplph.2011.01.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Using the TrichoEST database, generated in a previous functional genomics project from the beneficial filamentous fungus Trichoderma harzianum, a gene named Thkel1, which codes for a putative kelch-repeat protein, was isolated and characterized. Silencing of this gene in T. harzianum leads to a reduction of glucosidase activity and mycelial growth under abiotic stress conditions. Expression of this gene in Arabidopsis enhances plant tolerance to salt and osmotic stresses, accompanied by an increase in glucosidase activity and a reduction of abscisic acid levels compared to those observed in wild-type plants. Data presented throughout this article suggest the high value of T. harzianum as a source of genes able to facilitate the achievement of producing plants resistant to abiotic stresses without alteration of their phenotype.
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Affiliation(s)
- Rosa Hermosa
- Departamento de Microbiología y Genética, Centro Hispano-Luso de Investigaciones Agrarias (CIALE), Facultad de Farmacia, Universidad de Salamanca, C/Río Duero 12, Campus de Villamayor, 37185 Salamanca, Spain
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Wang YY, Fu ZB, Ng KL, Lam CC, Chan AKN, Sze KF, Wong WKR. Enhancement of excretory production of an exoglucanase from Escherichia coli with phage shock protein A (PspA) overexpression. J Microbiol Biotechnol 2011; 21:637-645. [PMID: 21715971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Production of recombinant proteins by excretory expression has many advantages over intracellular expression in Escherichia coli. Hyperexpression of a secretory exoglucanase, Exg, of Cellulomonas fimi was previously shown to saturate the SecYEG pathway and result in dramatic cell death of E. coli. In this study, we demonstrated that overexpression of the PspA in the JM101(pM1VegGcexL-pspA) strain enhanced excretion of Exg to 1.65 U/ml using shake-flask cultivation, which was 80% higher than the highest yield previously obtained from the optimized JM101(pM1VegGcexL) strain. A much higher excreted Exg activity of 4.5 U/ml was further achieved with high cell density cultivation using rich media. Furthermore, we showed that the PspA overexpression strain enjoyed an elevated critical value (CV), which was defined as the largest quotient between the intracellular unprocessed precursor and its secreted mature counterpart that was still tolerable by the host cells prior to the onset of cell death, improving from the previously determined CV of 20/80 to the currently achieved CV of 45/55 for Exg. The results suggested that the PspA overexpression strain might tolerate a higher level of precursor Exg making use of the SecYEG pathway for secretion. The reduced lethal effect might be attributable to the overexpressed PspA, which was postulated to be able to reduce membrane depolarization and damage. Our findings introduce a novel strategy of the combined application of metabolic engineering and construct optimization to the attainment of the best possible E. coli producers for secretory/excretory production of recombinant proteins, using Exg as the model protein.
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Affiliation(s)
- Y Y Wang
- Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Hoverfelt A, Sallinen R, Söderlund JM, Forsblom C, Pettersson-Fernholm K, Parkkonen M, Groop PH, Wessman M. DDOST, PRKCSH and LGALS3, which encode AGE-receptors 1, 2 and 3, respectively, are not associated with diabetic nephropathy in type 1 diabetes. Diabetologia 2010; 53:1903-7. [PMID: 20490454 DOI: 10.1007/s00125-010-1771-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2009] [Accepted: 03/23/2010] [Indexed: 10/19/2022]
Abstract
AIMS/HYPOTHESIS The AGE receptors 1, 2 and 3, which are encoded by DDOST, PRKCSH and LGALS3, respectively, may be involved in the pathogenesis of diabetic complications. We sought to find out whether these genes are associated with diabetic nephropathy, cardiovascular disease and type 1 diabetes or related quantitative traits. METHODS Using the Tagger program, we selected 28 single nucleotide polymorphisms (SNPs) based on the HapMap Centre d'Etude du Polymorphisme (Utah residents with northern and western European ancestry) data. The SNPs were genotyped in 2,719 Finnish patients with type 1 diabetes and tested for association with diabetic nephropathy (821 cases, 1,060 controls), cardiovascular disease and related quantitative traits. For association analysis with type 1 diabetes, 703 non-diabetic control participants were genotyped. RESULTS We found evidence of genotype association between diabetic nephropathy and the SNPs rs2170336 in DDOST (p = 0.03), rs311788 in PRKCSH (p = 0.04) and rs311778 in PRKCSH (p = 0.02). However, these associations did not reach the significance limit of 0.0008 adjusted for multiple testing. None of the DDOST, PRKCSH or LGALS3 SNPs were associated with quantitative traits related to diabetic nephropathy, including AER and estimated GFR. No associations were found between the SNPs and cardiovascular disease, blood pressure, serum lipid levels or type 1 diabetes. CONCLUSIONS/INTERPRETATION The common SNPs tested in DDOST, PRKCSH and LGALS3 do not seem to be associated with diabetic micro- or macrovascular complications or with type 1 diabetes in Finnish patients.
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Affiliation(s)
- A Hoverfelt
- Folkhälsan Institute of Genetics, Folkhälsan Research Center, Biomedicum Helsinki, University of Helsinki, Haartmaninkatu 8, Helsinki, Finland
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Guirimand G, Courdavault V, Lanoue A, Mahroug S, Guihur A, Blanc N, Giglioli-Guivarc'h N, St-Pierre B, Burlat V. Strictosidine activation in Apocynaceae: towards a "nuclear time bomb"? BMC Plant Biol 2010; 10:182. [PMID: 20723215 PMCID: PMC3095312 DOI: 10.1186/1471-2229-10-182] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Accepted: 08/19/2010] [Indexed: 05/02/2023]
Abstract
BACKGROUND The first two enzymatic steps of monoterpene indole alkaloid (MIA) biosynthetic pathway are catalysed by strictosidine synthase (STR) that condensates tryptamine and secologanin to form strictosidine and by strictosidine beta-D-glucosidase (SGD) that subsequently hydrolyses the glucose moiety of strictosidine. The resulting unstable aglycon is rapidly converted into a highly reactive dialdehyde, from which more than 2,000 MIAs are derived. Many studies were conducted to elucidate the biosynthesis and regulation of pharmacologically valuable MIAs such as vinblastine and vincristine in Catharanthus roseus or ajmaline in Rauvolfia serpentina. However, very few reports focused on the MIA physiological functions. RESULTS In this study we showed that a strictosidine pool existed in planta and that the strictosidine deglucosylation product(s) was (were) specifically responsible for in vitro protein cross-linking and precipitation suggesting a potential role for strictosidine activation in plant defence. The spatial feasibility of such an activation process was evaluated in planta. On the one hand, in situ hybridisation studies showed that CrSTR and CrSGD were coexpressed in the epidermal first barrier of C. roseus aerial organs. However, a combination of GFP-imaging, bimolecular fluorescence complementation and electromobility shift-zymogram experiments revealed that STR from both C. roseus and R. serpentina were localised to the vacuole whereas SGD from both species were shown to accumulate as highly stable supramolecular aggregates within the nucleus. Deletion and fusion studies allowed us to identify and to demonstrate the functionality of CrSTR and CrSGD targeting sequences. CONCLUSIONS A spatial model was drawn to explain the role of the subcellular sequestration of STR and SGD to control the MIA metabolic flux under normal physiological conditions. The model also illustrates the possible mechanism of massive activation of the strictosidine vacuolar pool upon enzyme-substrate reunion occurring during potential herbivore feeding constituting a so-called "nuclear time bomb" in reference to the "mustard oil bomb" commonly used to describe the myrosinase-glucosinolate defence system in Brassicaceae.
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Affiliation(s)
- Grégory Guirimand
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Vincent Courdavault
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Arnaud Lanoue
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Samira Mahroug
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
- Laboratoire Biodiversité Végétale, Conservation et Valorisation, Faculté des Sciences, Université Djillali Liabés, Sidi Bel Abbes, Algérie
| | - Anthony Guihur
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Nathalie Blanc
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Nathalie Giglioli-Guivarc'h
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Benoit St-Pierre
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
| | - Vincent Burlat
- Université François Rabelais de Tours, EA 2106 "Biomolécules et Biotechnologies Végétales"; IFR 135 "Imagerie fonctionnelle" 37200, Tours, France
- Université de Toulouse; UPS; UMR 5546, Surfaces Cellulaires et Signalisation chez les Végétaux; BP 42617, F-31326, Castanet-Tolosan, France
- CNRS; UMR 5546; BP 42617, F-31326, Castanet-Tolosan, France
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Luang S, Ketudat Cairns JR, Streltsov VA, Hrmova M. Crystallisation of wild-type and variant forms of a recombinant plant enzyme β-D-glucan glucohydrolase from barley (Hordeum vulgare L.) and preliminary X-ray analysis. Int J Mol Sci 2010; 11:2759-69. [PMID: 20717535 PMCID: PMC2920565 DOI: 10.3390/ijms11072759] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Revised: 07/16/2010] [Accepted: 07/16/2010] [Indexed: 11/17/2022] Open
Abstract
Wild-type and variant crystals of a recombinant enzyme beta-d-glucan glucohydrolase from barley (Hordeum vulgare L.) were obtained by macroseeding and cross-seeding with microcrystals obtained from native plant protein. Crystals grew to dimensions of up to 500 x 250 x 375 mum at 277 K in the hanging-drops by vapour-diffusion. Further, the conditions are described that yielded the wild-type crystals with dimensions of 80 x 40 x 60 mum by self-nucleation vapour-diffusion in sitting-drops at 281 K. The wild-type and recombinant crystals prepared by seeding techniques achived full size within 5-14 days, while the wild-type crystals grown by self-nucleation appeared after 30 days and reached their maximum size after another two months. Both the wild-type and recombinant variant crystals, the latter altered in the key catalytic and substrate-binding residues Glu220, Trp434 and Arg158/Glu161 belonged to the P4(3)2(1)2 tetragonal space group, i.e., the space group of the native microcrystals was retained in the newly grown recombinant crystals. The crystals diffracted beyond 1.57-1.95 A and the cell dimensions were between a = b = 99.2-100.8 A and c = 183.2-183.6 A. With one molecule in the asymmetric unit, the calculated Matthews coefficients were between 3.4-3.5 A(3).Da(-1) and the solvent contents varied between 63.4% and 64.5%. The macroseeding and cross-seeding techniques are advantageous, where a limited amount of variant proteins precludes screening of crystallisation conditions, or where variant proteins could not be crystallized.
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Affiliation(s)
- Sukanya Luang
- School of Biochemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; E-Mail: (S.L.); (J.R.K.C.)
| | - James R. Ketudat Cairns
- School of Biochemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; E-Mail: (S.L.); (J.R.K.C.)
| | - Victor A. Streltsov
- Molecular and Health Technologies, CSIRO-Commonwealth Scientific Research Organization, Victoria 3052, Australia; E-Mail:
| | - Maria Hrmova
- Australian Centre for Plant Functional Genomics, University of Adelaide, Waite Campus, Glen Osmond, South Australia 5064, Australia
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Adjei AA, Mandrekar SJ, Dy GK, Molina JR, Adjei AA, Gandara DR, Ziegler KLA, Stella PJ, Rowland KM, Schild SE, Zinner RG. Phase II trial of pemetrexed plus bevacizumab for second-line therapy of patients with advanced non-small-cell lung cancer: NCCTG and SWOG study N0426. J Clin Oncol 2010; 28:614-9. [PMID: 19841321 PMCID: PMC2815996 DOI: 10.1200/jco.2009.23.6406] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Accepted: 06/23/2009] [Indexed: 11/20/2022] Open
Abstract
PURPOSE To evaluate the efficacy and toxicity of pemetrexed combined with bevacizumab as second-line therapy for patients with advanced non-small-cell lung cancer (NSCLC) and to correlate allelic variants in pemetrexed-metabolizing genes with clinical outcome. PATIENTS AND METHODS Patients with previously treated NSCLC received pemetrexed (500 mg/m(2) intravenous) combined with bevacizumab (15 mg/kg intravenous) every 3 weeks. The primary end point, evaluated using a one-stage Fleming design for detecting a true success rate of at least 70%, was the proportion of patients who were progression free and on treatment at 3 months. Polymorphisms in genes responsible for pemetrexed transport (reduced folate carrier [SLC19A1]) and metabolism (folylpolyglutamate synthase [FPGS] and gamma-glutamyl hydrolase [GGH]) evaluated in germline DNA (blood) were correlated with treatment outcome. RESULTS Forty-eight evaluable patients (14 females and 34 males) received a median of four cycles (range, one to 20 cycles). The most common grade 3 or 4 nonhematologic adverse events (AEs) were fatigue (13%), dyspnea (10%), and thrombosis (10%). Grade 3 or 4 hematologic AEs were neutropenia (19%) and lymphopenia (13%). Twenty-four (57%; 95% CI, 41% to 72%) of the first 42 patients met the success criteria. Median overall survival (OS) and progression-free survival (PFS) times were 8.6 and 4.0 months, respectively. The exon 6 (2522)C-->T polymorphism in SLC19A1 correlated with 3-month progression-free status (P = .01) and with PFS (P = .05). The IVS1(1307)C-->T polymorphism in GGH correlated with OS (P = .04). CONCLUSION The study did not meet its primary end point. However, the median PFS time of 4 months is promising. Pharmacogenetic studies in larger cohorts are needed to definitively identify polymorphisms that predict for survival and toxicity of pemetrexed.
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Affiliation(s)
- Alex A Adjei
- Roswell Park Cancer Institute, Buffalo, NY 14263, USA.
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Abstract
By mid-2007, the three-dimensional (3D) structures of some 45,000 proteins have been solved, over a period where the linear structures of millions of genes have been defined. Technical challenges associated with X-ray crystallography are being overcome and high-throughput methods both for crystallization of proteins and for solving their 3D structures are under development. The question arises as to how structural biology can be integrated with and adds value to functional genomics programs. Structural biology will assist in the definition of gene function through the identification of the likely function of the protein products of genes. The 3D information allows protein sequences predicted from DNA sequences to be classified into broad groups, according to the overall 'fold', or 3D shape, of the protein. Structural information can be used to predict the preferred substrate of a protein, and thereby greatly enhance the accurate annotation of the corresponding gene. Furthermore, it will enable the effects of amino acid substitutions in enzymes to be better understood with respect to enzyme function and could thereby provide insights into natural variation in genes. If the molecular basis of transcription factor-DNA interactions were defined through precise 3D knowledge of the protein-DNA binding site, it would be possible to predict the effects of base substitutions within the motif on the specificity and/or kinetics of binding. In this chapter, we present specific examples of how structural biology can provide valuable information for functional genomics programs.
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Affiliation(s)
- Maria Hrmova
- Australian Centre for Plant Functional Genomics, School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, Glen Osmond, SA 5064, Australia
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Seo JS, An JH, Cheong JJ, Choi YD, Kim CH. Bifunctional recombinant fusion enzyme between maltooligosyltrehalose synthase and maltooligosyltrehalose trehalohydrolase of thermophilic microorganism Metallosphaera hakonensis. J Microbiol Biotechnol 2008; 18:1544-1549. [PMID: 18852510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
MhMTS and MhMTH are trehalose (alpha-D-glucopyranosyl- [1,1]-alpha-D-glucopyranose) biosynthesis genes of the thermophilic microorganism Metallosphaera hakonensis, and encode a maltooligosyltrehalose synthase (MhMTS) and a maltooligosyltrehalose trehalohydrolase (MhMTH), respectively. In this study, the two genes were fused inframe in a recombinant DNA, and expressed in Escherichia coli to produce a bifunctional fusion enzyme, MhMTSH. Similar to the two-step reactions with MhMTS and MhMTH, the fusion enzyme catalyzed the sequential reactions on maltopentaose, maltotriosyltrehalose formation, and following hydrolysis, producing trehalose and maltotriose. Optimum conditions for the fusion enzyme-catalyzed trehalose synthesis were around 70 degrees and pH 5.0-6.0. The MhMTSH fusion enzyme exhibited a high degree of thermostability, retaining 80% of the activity when pre-incubated at 70 degrees for 48 h. The stability was gradually abolished by incubating the fusion enzyme at above 80 degrees . The MhMTSH fusion enzyme was active on various sizes of maltooligosaccharides, extending its substrate specificity to soluble starch, the most abundant natural source of trehalose production.
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Affiliation(s)
- Ju-Seok Seo
- Department of Agricultural Biotechnology and Center for Agricultural Biomaterials, Seoul National University, Seoul 151-921, Korea
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Hogan MC, Torres VE. What the similarities of specific polycystic liver and kidney diseases can teach us about both. Nephrol News Issues 2008; 22:29-31. [PMID: 18778002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Affiliation(s)
- Marie C Hogan
- Division of Nephrology and Hypertension, Department of Internal Medicine, Mayo Clinic, Rochester, Minn., USA
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Fang TY, Tseng WC, Shih TY, Wang MY. Identification of the essential catalytic residues and selectivity-related residues of maltooligosyltrehalose trehalohydrolase from the thermophilic archaeon Sulfolobus solfataricus ATCC 35092. J Agric Food Chem 2008; 56:5628-5633. [PMID: 18563901 DOI: 10.1021/jf073320b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Maltooligosyltrehalose trehalohydrolase (MTHase) catalyzes the release of trehalose by cleaving the alpha-1,4-glucosidic linkage next to the alpha-1,1-linked terminal disaccharide of maltooligosyltrehalose. Mutations at residues D255, E286, and D380 were constructed to identify the essential catalytic residues of MTHase, while mutations at residues W218, A259, Y328, F355, and R356 were constructed to identify selectivity-related residues of the enzyme. The specific activities of the purified D255A, E286A, and D380A MTHases were only 0.15, 0.09 and 0.01%, respectively, of that of wild-type MTHase, suggesting that these three residues are essential catalytic residues. Compared with wild-type MTHase, A259S, Y328F, F355Y, and R356K MTHases had increased selectivity ratios, which were defined as the ratios of the catalytic efficiencies for glucose formation to those for trehalose formation in the hydrolysis of maltooligosaccharides and maltooligosyltrehaloses, respectively, while W218A and W218F MTHases had decreased selectivity ratios. When starch digestion was carried out at 75 degrees C and wild-type and mutant MTHases were, respectively, used with isoamylase and maltooligosyltrehalose synthase (MTSase), the ratios of initial rates of glucose formation to those of trehalose formation were inversely correlated to the peak trehalose yields.
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Affiliation(s)
- Tsuei-Yun Fang
- Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan.
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Abstract
The objectives of this study were to characterize Fibrobacter succinogenes glycoside hydrolases from different glycoside hydrolase families and to study their synergistic interactions. The gene encoding a major endoglucanase (endoglucanase 1) of F. succinogenes S85 was identified as cel9B from the genome sequence by reference to internal amino acid sequences of the purified native enzyme. Cel9B and two other glucanases from different families, Cel5H and Cel8B, were cloned and overexpressed, and the proteins were purified and characterized. These proteins in conjunction with two predominant cellulases, Cel10A, a chloride-stimulated cellobiosidase, and Cel51A, formerly known as endoglucanase 2 (or CelF), were assayed in various combinations to assess their synergistic interactions using ball-milled cellulose. The degree of synergism ranged from 0.6 to 3.7. The two predominant endoglucanases produced by F. succinogenes, Cel9B and Cel51A, were shown to have a synergistic effect of up to 1.67. Cel10A showed little synergy in combination with Cel9B and Cel51A. Mixtures containing all the enzymes gave a higher degree of synergism than those containing two or three enzymes, which reflected the complementarity in their modes of action as well as substrate specificities.
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Affiliation(s)
- Meng Qi
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada
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Ahn YO, Saino H, Mizutani M, Shimizu BI, Sakata K. Vicianin hydrolase is a novel cyanogenic beta-glycosidase specific to beta-vicianoside (6-O-alpha-L-arabinopyranosyl-beta-D-glucopyranoside) in seeds of Vicia angustifolia. Plant Cell Physiol 2007; 48:938-47. [PMID: 17548373 DOI: 10.1093/pcp/pcm065] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The cyanogenic disaccharide glycoside, vicianin [mandelonitrile beta-vicianoside (6-O-alpha-L-arabinopyranosyl-beta-D-glucopyranoside)], is accumulated in seeds of Vicia angustifolia var. segetalis. Vicianin hydrolase (VH) catalyzes the hydrolysis of vicianin into mandelonitrile and a disaccharide vicianose. VH was purified from the seeds using DEAE-, CM- and Con A-Sepharose chromatography, and the molecular mass of the purified VH was estimated to be 56 kDa on SDS-PAGE. The N-terminal amino acid sequence of the purified VH was determined, and a cDNA encoding VH was obtained. The deduced VH protein consists of a 509 amino acid polypeptide containing a putative secretion signal peptide. It shares about 50% identity with various kinds of plant beta-glycosidases including tea leaf beta-primeverosidase and furcatin hydrolase, and is classified in family 1 of the glycosyl hydrolases. The VH transcript was detected abundantly in seeds and moderately in flowers, but only slightly in leaves, stems and roots, indicating that the organ distribution of VH expression is similar to that of the substrate vicianin. The recombinant VH was produced in insect cells with a baculovirus system, and was compared with the native VH in terms of substrate specificity. Both enzymes hydrolyzed vicianin to release vicianose, demonstrating that VH is a disaccharide-specific beta-glycosidase. VH also hydrolyzed the mandelonitrile beta-glucoside prunasin to some extent but did not hydrolyze the gentiobioside amygdalin, both of which contain the same aglycone as vicianin. Thus, VH is a unique cyanogenic glycosidase showing high glycone specificity for the disaccharide vicianoside.
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Affiliation(s)
- Young Ock Ahn
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011 Japan
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Berkner S, Grogan D, Albers SV, Lipps G. Small multicopy, non-integrative shuttle vectors based on the plasmid pRN1 for Sulfolobus acidocaldarius and Sulfolobus solfataricus, model organisms of the (cren-)archaea. Nucleic Acids Res 2007; 35:e88. [PMID: 17576673 PMCID: PMC1919505 DOI: 10.1093/nar/gkm449] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The extreme thermoacidophiles of the genus Sulfolobus are among the best-studied archaea but have lacked small, reliable plasmid vectors, which have proven extremely useful for manipulating and analyzing genes in other microorganisms. Here we report the successful construction of a series of Sulfolobus-Escherichia coli shuttle vectors based on the small multicopy plasmid pRN1 from Sulfolobus islandicus. Selection in suitable uracil auxotrophs is provided through inclusion of pyrEF genes in the plasmid. The shuttle vectors do not integrate into the genome and do not rearrange. The plasmids allow functional overexpression of genes, as could be demonstrated for the beta-glycosidase (lacS) gene of S. solfataricus. In addition, we demonstrate that this beta-glycosidase gene could function as selectable marker in S. solfataricus. The shuttle plasmids differ in their interruption sites within pRN1 and allowed us to delineate functionally important regions of pRN1. The orf56/orf904 operon appears to be essential for pRN1 replication, in contrast interruption of the highly conserved orf80/plrA gene is tolerated. The new vector system promises to facilitate genetic studies of Sulfolobus and to have biotechnological uses, such as the overexpression or optimization of thermophilic enzymes that are not readily performed in mesophilic hosts.
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Affiliation(s)
- Silvia Berkner
- Department of Biochemistry, University of Bayreuth, 95440 Bayreuth, Germany, Department of Biological Sciences, University of Cincinnati, OH 45221-0006, USA and Department of Molecular Microbiology, University of Groningen, 9751 NN Haren, The Netherlands
| | - Dennis Grogan
- Department of Biochemistry, University of Bayreuth, 95440 Bayreuth, Germany, Department of Biological Sciences, University of Cincinnati, OH 45221-0006, USA and Department of Molecular Microbiology, University of Groningen, 9751 NN Haren, The Netherlands
| | - Sonja-Verena Albers
- Department of Biochemistry, University of Bayreuth, 95440 Bayreuth, Germany, Department of Biological Sciences, University of Cincinnati, OH 45221-0006, USA and Department of Molecular Microbiology, University of Groningen, 9751 NN Haren, The Netherlands
| | - Georg Lipps
- Department of Biochemistry, University of Bayreuth, 95440 Bayreuth, Germany, Department of Biological Sciences, University of Cincinnati, OH 45221-0006, USA and Department of Molecular Microbiology, University of Groningen, 9751 NN Haren, The Netherlands
- *To whom correspondence should be addressed: +49 921 552433, Fax: +49 921 552432,
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Miyake R, Kawamoto J, Wei YL, Kitagawa M, Kato I, Kurihara T, Esaki N. Construction of a low-temperature protein expression system using a cold-adapted bacterium, Shewanella sp. strain Ac10, as the host. Appl Environ Microbiol 2007; 73:4849-56. [PMID: 17526788 PMCID: PMC1951021 DOI: 10.1128/aem.00824-07] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A recombinant protein expression system working at low temperatures is expected to be useful for the production of thermolabile proteins. We constructed a low-temperature expression system using an Antarctic cold-adapted bacterium, Shewanella sp. strain Ac10, as the host. We evaluated the promoters for proteins abundantly produced at 4 degrees C in this bacterium to express foreign proteins. We used 27 promoters and a broad-host-range vector, pJRD215, to produce beta-lactamase in Shewanella sp. strain Ac10. The maximum yield was obtained when the promoter for putative alkyl hydroperoxide reductase (AhpC) was used and the recombinant cells were grown to late stationary phase. The yield was 91 mg/liter of culture at 4 degrees C and 139 mg/liter of culture at 18 degrees C. We used this system to produce putative peptidases, PepF, LAP, and PepQ, and a putative glucosidase, BglA, from a psychrophilic bacterium, Desulfotalea psychrophila DSM12343. We obtained 48, 7.1, 28, and 5.4 mg/liter of culture of these proteins, respectively, in a soluble fraction. The amounts of PepF and PepQ produced by this system were greater than those produced by the Escherichia coli T7 promoter system.
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Affiliation(s)
- Ryoma Miyake
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, Japan
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Vilei EM, Correia I, Ferronha MH, Bischof DF, Frey J. Beta-D-glucoside utilization by Mycoplasma mycoides subsp. mycoides SC: possible involvement in the control of cytotoxicity towards bovine lung cells. BMC Microbiol 2007; 7:31. [PMID: 17439646 PMCID: PMC1855930 DOI: 10.1186/1471-2180-7-31] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2006] [Accepted: 04/17/2007] [Indexed: 12/20/2022] Open
Abstract
Background Contagious bovine pleuropneumonia (CBPP) caused by Mycoplasma mycoides subsp. mycoides small-colony type (SC) is among the most serious threats for livestock producers in Africa. Glycerol metabolism-associated H2O2 production seems to play a crucial role in virulence of this mycoplasma. A wide number of attenuated strains of M. mycoides subsp. mycoides SC are currently used in Africa as live vaccines. Glycerol metabolism is not affected in these vaccine strains and therefore it does not seem to be the determinant of their attenuation. A non-synonymous single nucleotide polymorphism (SNP) in the bgl gene coding for the 6-phospho-β-glucosidase (Bgl) has been described recently. The SNP differentiates virulent African strains isolated from outbreaks with severe CBPP, which express the Bgl isoform Val204, from strains to be considered less virulent isolated from CBPP outbreaks with low mortality and vaccine strains, which express the Bgl isoform Ala204. Results Strains of M. mycoides subsp. mycoides SC considered virulent and possessing the Bgl isoform Val204, but not strains with the Bgl isoform Ala204, do trigger elevated levels of damage to embryonic bovine lung (EBL) cells upon incubation with the disaccharides (i.e., β-D-glucosides) sucrose and lactose. However, strains expressing the Bgl isoform Val204 show a lower hydrolysing activity on the chromogenic substrate p-nitrophenyl-β-D-glucopyranoside (pNPbG) when compared to strains that possess the Bgl isoform Ala204. Defective activity of Bgl in M. mycoides subsp. mycoides SC does not lead to H2O2 production. Rather, the viability during addition of β-D-glucosides in medium-free buffers is higher for strains harbouring the Bgl isoform Val204 than for those with the isoform Ala204. Conclusion Our results indicate that the studied SNP in the bgl gene is one possible cause of the difference in bacterial virulence among strains of M. mycoides subsp. mycoides SC. Bgl does not act as a direct virulence factor, but strains possessing the Bgl isoform Val204 with low hydrolysing activity are more prone to survive in environments that contain high levels of β-D-glucosides, thus contributing in some extent to mycoplasmaemia.
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Affiliation(s)
- Edy M Vilei
- Institute of Veterinary Bacteriology, University of Bern, Länggass-Strasse 122, Postfach, CH-3001 Bern, Switzerland
| | - Ivone Correia
- Laboratório Nacional de Investigação Veterinária, Departamento de Biologia Celular, Estrada de Benfica 701, P-1549-011 Lisbon, Portugal
| | - M Helena Ferronha
- Laboratório Nacional de Investigação Veterinária, Departamento de Biologia Celular, Estrada de Benfica 701, P-1549-011 Lisbon, Portugal
| | - Daniela F Bischof
- Institute of Veterinary Bacteriology, University of Bern, Länggass-Strasse 122, Postfach, CH-3001 Bern, Switzerland
| | - Joachim Frey
- Institute of Veterinary Bacteriology, University of Bern, Länggass-Strasse 122, Postfach, CH-3001 Bern, Switzerland
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Park NY, Cha J, Kim DO, Park CS. Enzymatic characterization and substrate specificity of thermostable beta-glycosidase from hyperthermophilic archaea, Sulfolobus shibatae, expressed in E. coli. J Microbiol Biotechnol 2007; 17:454-460. [PMID: 18050949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Enzymatic properties and substrate specificity of recombinant beta-glycosidases from a hyperthermophilic archaeon, Sulfolobus shibatae (rSSG), were analyzed. rSSG showed its optimum temperature and pH at 95 degrees C and pH 5.0, respectively. Thermal inactivation of rSSG showed that its half-life of enzymatic activity at 75 degrees C was 15 h whereas it drastically decreased to 3.9 min at 95 degrees C. The addition of 10 mM of MnCl2 enhanced the hydrolysis activity of rSSG up to 23% whereas most metal ions did not show any considerable effect. Dithiothreitol (DTT) and 2-mercaptoethanol exhibited significant influence on the increase of the hydrolysis activity of rSSG. rSSG apparently preferred laminaribiose (beta1-->3Glc), followed by sophorose (beta1-->2Glc), gentiobiose (beta1-->6Glc), and cellobiose (beta1--4Glc). Various intermolecular transfer products were formed by rSSG in the lactose reaction, indicating that rSSG prefers lactose as a good acceptor as well as a donor. The strong intermolecular transglycosylation activity of rSSG can be applied in making functional oligosaccharides.
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Affiliation(s)
- Na-Young Park
- Department of Food Science and Biotechnology, Graduate School of Biotechnology & Institute of Life Sciences and Resources, KyungHee University, Yongin 449-701, Korea
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Papa R, Rippa V, Sannia G, Marino G, Duilio A. An effective cold inducible expression system developed in Pseudoalteromonas haloplanktis TAC125. J Biotechnol 2007; 127:199-210. [PMID: 16959351 DOI: 10.1016/j.jbiotec.2006.07.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Revised: 05/18/2006] [Accepted: 07/02/2006] [Indexed: 11/23/2022]
Abstract
A regulative two-component system previously identified in Pseudoalteromonas haloplanktis TAC125 was used to construct a cold inducible expression system that is under the control of l-malate. Performances of the inducible system were tested for both psychrophilic and mesophilic protein production using two "difficult" proteins as control. The results obtained demonstrated that both psychrophilic beta-galactosidase and yeast alpha-glucosidase are produced in a fully soluble and catalytically competent form. Optimal conditions for protein production, including growth temperature, growth medium and l-malate concentration were also investigated. Under optimized conditions yields of 620 and 27 mg/l were obtained for beta-galactosidase and alpha-glucosidase, respectively.
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Affiliation(s)
- Rosanna Papa
- Department of Organic Chemistry and Biochemistry, Federico II University of Naples, Napoli, Italy
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Seo JS, An JH, Baik MY, Park CS, Cheong JJ, Moon TW, Park KH, Choi YD, Kim CH. Molecular cloning and characterization of trehalose biosynthesis genes from hyperthermophilic archaebacterium Metallosphaera hakonesis. J Microbiol Biotechnol 2007; 17:123-129. [PMID: 18051363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The trehalose (alpha-D-glucopyranosyl-[1,1]-alpha-D-glucopyranose) biosynthesis genes MhMTS and MhMTH, encoding a maltooligosyltrehalose synthase (MhMTS) and a maltooligosyltrehalose trehalohydrolase (MhMTH), respectively, have been cloned from the hyperthermophilic archaebacterium Metallosphaera hakonesis. The ORF of MhMTS is 2,142 bp long, and encodes 713 amino acid residues constituting a 83.8 kDa protein. MhMTH is 1,677 bp long, and encodes 558 amino acid residues constituting a 63.7 kDa protein. The deduced amino acid sequences of MhMTS and MhMTH contain four regions highly conserved for MTSs and three for MTHs that are known to constitute substrate-binding sites of starch-hydrolyzing enzymes. Recombinant proteins obtained by expressing the MhMTS and MhMTH genes in E. coli catalyzed a sequential reaction converting maltooligosaccharides to produce trehalose. Optimum pH of the MhMTS/MhMTH enzyme reaction was around 5.0 and optimum temperature was around 70 degrees C. Trehalose-producing activity of the MhMTS/ MhMTH was notably stable, retaining 80% of the activity after preincubation of the enzyme mixture at 70 degrees C for 48 h, but was gradually abolished by incubating at above 85 degrees C. Addition of thermostable 4-alpha-glucanotransferase increased the yield of trehalose production from maltopentaose by 10%. The substrate specificity of the MhMTS/MhMTH-catalyzed reaction was extended to soluble starch, the most abundant maltodextrin in nature.
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Affiliation(s)
- Ju-Seok Seo
- Department of Agricultural Biotechnology and Center for Agricultural Biomaterials, Seoul National University, Seoul 151-921, Korea
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Ishii A, Ikeda T, Hitoshi S, Fujimoto I, Torii T, Sakuma K, Nakakita SI, Hase S, Ikenaka K. Developmental changes in the expression of glycogenes and the content of N-glycans in the mouse cerebral cortex. Glycobiology 2006; 17:261-76. [PMID: 17172259 DOI: 10.1093/glycob/cwl076] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Biosynthesis of N-glycans varies significantly among tissues and is strictly regulated spatially and temporally within the tissue. The strict molecular mechanisms that are responsible for control of N-glycan synthesis remain largely unknown. We developed complementary deoxyribonucleic acid (cDNA) macroarray system and analyzed gene expression levels of more than 140 glycosyltransferases and glycosidases in the cerebral cortex from developing and adult mice. We also analyzed the relative amounts of major N-glycans present in the cerebral cortex and examined how the synthesis of N-glycans might be regulated through the expression of these genes. We demonstrated that the content of N-linked oligosaccharides dramatically changed during the course of brain development. Some of these changes could not be explained by alterations in the expression of the corresponding genes. For example, the amount of core fucosylated sugar chains in the early embryonic brain and the expression level of fucosyltransferase VIII, the only gene known to be responsible for core fucosylation, did not change proportionately. This result suggests that post-transcriptional regulation of this gene plays an important role in regulating its enzymatic activity. On the other hand, the amount of beta1,3-galactose residue-containing sugar chains increased postnatally following an increase in the level of beta1,3-galactosyltransferase messenger ribonucleic acid (mRNA). Furthermore, the amount of sugar chains with an outer fucose residue, containing LewisX-BA-2, correlated well with the expression of fusocyltransferase IX mRNA. These findings add to our understanding of the molecular mechanisms responsible for the regulation of N-glycan biosynthesis in the cerebral cortex.
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Affiliation(s)
- Akihiro Ishii
- Department of Physiological Sciences, The Graduate University for Advanced Studies, Okazaki, Aichi, Japan
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Shi HP, Lindemann P. Expression of recombinant Digitalis lanata EHRH. cardenolide 16'-O-glucohydrolase in Cucumis sativus L. hairy roots. Plant Cell Rep 2006; 25:1193-8. [PMID: 16775721 DOI: 10.1007/s00299-006-0183-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2006] [Revised: 05/04/2006] [Accepted: 05/17/2006] [Indexed: 05/10/2023]
Abstract
The coding sequence for the Digitalis lanata EHRH. cardenolide 16'-O-glucohydrolase was inserted downstream of the 35S promoter in the binary vector pBI121 resulting in plant expression vector pBI121cgh. Cotyledon explants excised from 10-day-old seedlings of Cucumis sativus L. were transformed using Agrobacterium rhizogenes 15834 harbouring pBI121cgh. Hairy roots were obtained from infected cotyledon explants in vitro 10 days after inoculation. PCR amplification of coding sequences for cgh I, rolB and rolC from Ri plasmid showed that the aimed sequences were inserted into the genome of transformed cucumber hairy roots. Glycolytic activity of the transgenic CGH I was measured by HPLC using Lanatoside glycosides as substrate. Therefore, the cgh I transformed cucumber hairy roots may provide a valuable model for biotransformation of natural compounds by recombinant enzymes.
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Affiliation(s)
- He-Ping Shi
- Institut für Pharmakologie und Pharmazeutische Biologie, Martin-Luther--Universität, Hoher Weg 8, 06120, Halle (Saale), Germany
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Fang TY, Tseng WC, Guo MS, Shih TY, Hung XG. Expression, purification, and characterization of the maltooligosyltrehalose trehalohydrolase from the thermophilic archaeon Sulfolobus solfataricus ATCC 35092. J Agric Food Chem 2006; 54:7105-12. [PMID: 16968069 DOI: 10.1021/jf061318z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The maltooligosyltrehalose trehalohydrolase (MTHase) mainly cleaves the alpha-1,4-glucosidic linkage next to the alpha-1,1-linked terminal disaccharide of maltooligosyltrehalose to produce trehalose and the maltooligosaccharide with lower molecular mass. In this study, the treZ gene encoding MTHase was PCR-cloned from Sulfolobus solfataricus ATCC 35092 and then expressed in Escherichia coli. A high yield of the active wild-type MTHase, 13300 units/g of wet cells, was obtained in the absence of IPTG induction. Wild-type MTHase was purified sequentially using heat treatment, nucleic acid precipitation, and ion-exchange chromatography. The purified wild-type MTHase showed an apparent optimal pH of 5 and an optimal temperature at 85 degrees C. The enzyme was stable at pH values ranging from 3.5 to 11, and the activity was fully retained after a 2-h incubation at 45-85 degrees C. The k(cat) values of the enzyme for hydrolysis of maltooligosyltrehaloses with degree of polymerization (DP) 4-7 were 193, 1030, 1190, and 1230 s(-1), respectively, whereas the k(cat) values for glucose formation during hydrolysis of DP 4-7 maltooligosaccharides were 5.49, 17.7, 18.2, and 6.01 s(-1), respectively. The K(M) values of the enzyme for hydrolysis of DP 4-7 maltooligosyltrehaloses and those for maltooligosaccharides are similar at the same corresponding DPs. These results suggest that this MTHase could be used to produce trehalose at high temperatures.
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Affiliation(s)
- Tsuei-Yun Fang
- Department of Food Science, National Taiwan Ocean University, Keelung,
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