Crystal structure of leishmania major oligopeptidase B gives insight into the enzymatic properties of a trypanosomatid virulence factor

McLuskey, K., Paterson, N. G., Bland, N. D., Isaacs, N. W. and Mottram, J. C. (2010) Crystal structure of leishmania major oligopeptidase B gives insight into the enzymatic properties of a trypanosomatid virulence factor. Journal of Biological Chemistry, 285(50), pp. 39249-39259. (doi:10.1074/jbc.M110.156679)

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Publisher's URL: http://dx.doi.org/10.1074/jbc.M110.156679

Abstract

Oligopeptidase B (OPB) is a serine peptidase with dibasic substrate specificity. It is found in bacteria, plants and trypanosomatid pathogens, where it has been identified as a virulence factor and potential drug target. In this study we expressed active recombinant Leishmania major OPB and provide the first structure of an oligopeptidase B at high resolution. The crystallographic study reveals that OPB comprises two domains, a catalytic and a propeller domain, linked together by a hinge region. The structure has been determined in complex with the oligopeptide, protease-inhibitor antipain, giving detailed information on the enzyme's active site and extended substrate binding pockets. It shows that Glu-621 plays a critical role in the S1 binding pocket and, along with Phe-603, is largely responsible for the enzyme's substrate specificity in P1. In the S2 binding pocket, Tyr-499 was shown to be important for substrate stability. The structure also allowed an investigation into the function of residues highlighted in other studies including Glu-623 which was predicted to be involved in the S1 binding pocket but is found forming an inter-domain hydrogen bond. Additional important salt bridges/hydrogen bonds between the two domains were observed, highlighting the significance of the domain interface in OPB. This work provides a foundation for the study of the role of OPBs as virulence factors in trypanosomatids. It could facilitate the development of specific OPB inhibitors with therapeutic potential by exploiting its unique substrate recognition properties as well as providing a model for OPBs in general.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McLuskey, Dr Karen and Bland, Mr Nicholas and Paterson, Mr Neil and Isaacs, Professor Neil and Mottram, Professor Jeremy
Authors: McLuskey, K., Paterson, N. G., Bland, N. D., Isaacs, N. W., and Mottram, J. C.
Subjects:Q Science > QD Chemistry
Q Science > QR Microbiology
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
College of Science and Engineering > School of Chemistry
Journal Name:Journal of Biological Chemistry
Journal Abbr.:J Biol Chem.
Publisher:American Society for Biochemistry and Molecular Biology, Inc.
ISSN:0021-9258
ISSN (Online):1083-351X
Published Online:05 October 2010
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
351631Molecular genetics and biochemistry of parasitesJeremy MottramMedical Research Council (MRC)G9722968Infection Immunity and Inflammation Life Sciences
297261Post-genomic analysis of cysteine protease function in Leishmania parasitesJeremy MottramMedical Research Council (MRC)G0000508Infection Immunity and Inflammation Life Sciences