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Characterization of a salt-tolerant aminopeptidase from marine Bacillus licheniformis SWJS33 that improves hydrolysis and debittering efficiency for soy protein isolate. Food Chem 2017; 214:347-353. [DOI: 10.1016/j.foodchem.2016.07.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 05/16/2016] [Accepted: 07/05/2016] [Indexed: 11/19/2022]
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Modak JK, Rut W, Wijeyewickrema LC, Pike RN, Drag M, Roujeinikova A. Structural basis for substrate specificity of Helicobacter pylori M17 aminopeptidase. Biochimie 2015; 121:60-71. [PMID: 26616008 DOI: 10.1016/j.biochi.2015.11.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 11/20/2015] [Indexed: 11/25/2022]
Abstract
The M17 aminopeptidase from the carcinogenic gastric bacterium Helicobacter pylori (HpM17AP) is an important housekeeping enzyme involved in catabolism of endogenous and exogenous peptides. It is implicated in H. pylori defence against the human innate immune response and in the mechanism of metronidazole resistance. Bestatin inhibits HpM17AP and suppresses H. pylori growth. To address the structural basis of catalysis and inhibition of this enzyme, we have established its specificity towards the N-terminal amino acid of peptide substrates and determined the crystal structures of HpM17AP and its complex with bestatin. The position of the D-phenylalanine moiety of the inhibitor with respect to the active-site metal ions, bicarbonate ion and with respect to other M17 aminopeptidases suggested that this residue binds to the S1 subsite of HpM17AP. In contrast to most characterized M17 aminopeptidases, HpM17AP displays preference for L-Arg over L-Leu residues in peptide substrates. Compared to very similar homologues from other bacteria, a distinguishing feature of HpM17AP is a hydrophilic pocket at the end of the S1 subsite that is likely to accommodate the charged head group of the L-Arg residue of the substrate. The pocket is flanked by a sodium ion (not present in M17 aminopeptidases that show preference for L-Leu) and its coordinating water molecules. In addition, the structure suggests that variable loops at the entrance to, and in the middle of, the substrate-binding channel are important determinants of substrate specificity of M17 aminopeptidases.
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Affiliation(s)
- Joyanta K Modak
- Infection and Immunity Program, Monash Biomedical Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia
| | - Wioletta Rut
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wroclaw, Poland
| | - Lakshmi C Wijeyewickrema
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Robert N Pike
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia
| | - Marcin Drag
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wroclaw, Poland
| | - Anna Roujeinikova
- Infection and Immunity Program, Monash Biomedical Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia; Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.
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Cheng C, Wang X, Dong Z, Shao C, Yang Y, Fang W, Fang C, Wang H, Yang M, Jiang L, Zhou X, Song H. Aminopeptidase T of M29 Family Acts as A Novel Intracellular Virulence Factor for Listeria monocytogenes Infection. Sci Rep 2015; 5:17370. [PMID: 26610705 PMCID: PMC4661694 DOI: 10.1038/srep17370] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/29/2015] [Indexed: 01/18/2023] Open
Abstract
The foodborne pathogen Listeria monocytogenes employs a number of virulence determinants including metalloproteases to infect hosts. Here for the first time, we identified an M29 family aminopeptidase T (encoded by lmo1603) from L. monocytogenes that possesses a typical feature to catalyze the cleavage of amino acids from peptide substrates, with a preference for arginine. The purified recombinant Lmo1603 was activated by Fe3+, Zn2+ and Mn2+, but strongly stimulated by Co2+, indicating that Lmo1603 is a cobalt-dependent aminopeptidase. Single mutation at any of the Glu216, Glu281, His308, Tyr315, His327, and Asp329 completely abolished the enzymatic activity of Lmo1603. More importantly, we showed that Lmo1603 was mainly involved in Listeria infection, but not required for growth in rich laboratory medium and minimal defined medium. Disruption of Lmo1603 resulted in almost complete attenuation of Listeria virulence in a mouse infection model. In addition, we demonstrated that Lmo1603 was mainly localized in the bacterial cytosol and required for invasion and survival inside human epithelial cells and murine macrophages. We conclude that Lmo1603 encodes a functional aminopeptidase T of M29 family, which acts as a novel intracellular virulence factor essential in the successful establishment of L. monocytogenes infections in a mouse model.
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Affiliation(s)
- Changyong Cheng
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Xiaowen Wang
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Zhimei Dong
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Chunyan Shao
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Yongchun Yang
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Weihuan Fang
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China.,Zhejiang University Institute of Preventive Veterinary Medicine, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, P. R. China
| | - Chun Fang
- Zhejiang University Institute of Preventive Veterinary Medicine, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, P. R. China
| | - Hang Wang
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Menghua Yang
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
| | - Lingli Jiang
- Zhoushan Entry-Exit Inspection and Quarantine Bureau, 555 Haijing Road, Zhoushan, Zhejiang 316000, P. R. China
| | - Xiangyang Zhou
- Zhoushan Entry-Exit Inspection and Quarantine Bureau, 555 Haijing Road, Zhoushan, Zhejiang 316000, P. R. China
| | - Houhui Song
- College of Animal Science and Technology, Zhejiang A&F University, 88 Huanchengbei Road, Lin'an, Zhejiang 311300, P. R. China
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Jarocki VM, Santos J, Tacchi JL, Raymond BBA, Deutscher AT, Jenkins C, Padula MP, Djordjevic SP. MHJ_0461 is a multifunctional leucine aminopeptidase on the surface of Mycoplasma hyopneumoniae. Open Biol 2015; 5:140175. [PMID: 25589579 PMCID: PMC4313372 DOI: 10.1098/rsob.140175] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aminopeptidases are part of the arsenal of virulence factors produced by bacterial pathogens that inactivate host immune peptides. Mycoplasma hyopneumoniae is a genome-reduced pathogen of swine that lacks the genetic repertoire to synthesize amino acids and relies on the host for availability of amino acids for growth. M. hyopneumoniae recruits plasmin(ogen) onto its cell surface via the P97 and P102 adhesins and the glutamyl aminopeptidase MHJ_0125. Plasmin plays an important role in regulating the inflammatory response in the lungs of pigs infected with M. hyopneumoniae. We show that recombinant MHJ_0461 (rMHJ_0461) functions as a leucine aminopeptidase (LAP) with broad substrate specificity for leucine, alanine, phenylalanine, methionine and arginine and that MHJ_0461 resides on the surface of M. hyopneumoniae. rMHJ_0461 also binds heparin, plasminogen and foreign DNA. Plasminogen bound to rMHJ_0461 was readily converted to plasmin in the presence of tPA. Computational modelling identified putative DNA and heparin-binding motifs on solvent-exposed sites around a large pore on the LAP hexamer. We conclude that MHJ_0461 is a LAP that moonlights as a multifunctional adhesin on the cell surface of M. hyopneumoniae.
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Affiliation(s)
- Veronica M Jarocki
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
| | - Jerran Santos
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia Proteomics Core Facility, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
| | - Jessica L Tacchi
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
| | - Benjamin B A Raymond
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
| | - Ania T Deutscher
- NSW Department of Primary Industries, Private Bag 4008, Narellan, New South Wales 2567, Australia
| | - Cheryl Jenkins
- NSW Department of Primary Industries, Private Bag 4008, Narellan, New South Wales 2567, Australia
| | - Matthew P Padula
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia Proteomics Core Facility, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
| | - Steven P Djordjevic
- The ithree institute, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia Proteomics Core Facility, University of Technology, Sydney, PO Box 123, Broadway, New South Wales 2007, Australia
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Carroll RK, Robison TM, Rivera FE, Davenport JE, Jonsson IM, Florczyk D, Tarkowski A, Potempa J, Koziel J, Shaw LN. Identification of an intracellular M17 family leucine aminopeptidase that is required for virulence in Staphylococcus aureus. Microbes Infect 2012; 14:989-99. [PMID: 22613209 DOI: 10.1016/j.micinf.2012.04.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 04/10/2012] [Accepted: 04/23/2012] [Indexed: 12/29/2022]
Abstract
Staphylococcus aureus is a highly virulent bacterial pathogen capable of causing a variety of ailments throughout the human body. It is a major public health concern due to the continued emergence of highly pathogenic methicillin resistant strains (MRSA) both within hospitals and in the community. Virulence in S. aureus is mediated by an array of secreted and cell wall associated virulence factors, including toxins, hemolysins and proteases. In this work we identify a leucine aminopeptidase (LAP, pepZ) that strongly impacts the pathogenic abilities of S. aureus. Disruption of the pepZ gene in either Newman or USA300 resulted in a dramatic attenuation of virulence in both localized and systemic models of infection. LAP is required for survival inside human macrophages and gene expression analysis shows that pepZ expression is highest in the intracellular environment. We examine the cellular location of LAP and demonstrate that it is localized to the bacterial cytosol. These results identify for the first time an intracellular leucine aminopeptidase that influences disease causation in a Gram-positive bacterium.
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Affiliation(s)
- Ronan K Carroll
- Department of Cell Biology, Microbiology & Molecular Biology, University of South Florida, 4202 East Fowler Ave, ISA2015 Tampa, FL 33620, USA
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Solecka J, Rajnisz A, Postek M, Zajko J, Kawecki R, Havlicek V, Bednarek E, Kozerski L. N-acetyl-3,4-dihydroxy-L-phenylalanine, a second identified bioactive metabolite produced by Streptomyces sp. 8812. J Antibiot (Tokyo) 2012; 65:219-21. [PMID: 22293914 DOI: 10.1038/ja.2012.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jolanta Solecka
- Laboratory of Biologically Active Compounds, National Institute of Public Health-National Institute of Hygiene, Warsaw, Poland.
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Ye XJ, Ng T. Purification and characterisation of a leucine aminopeptidase from Lactococcus lactis subsp. lactis cultured in skim milk. Int Dairy J 2011. [DOI: 10.1016/j.idairyj.2011.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Jankiewicz U, Wnuk A. An activated by cobalt alkaline aminopeptidase from Bacillus mycoides. APPL BIOCHEM MICRO+ 2011. [DOI: 10.1134/s0003683811020050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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