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Structural and functional characterization of Salmonella enterica serovar Typhimurium YcbL: An unusual Type II glyoxalase

Lookup NU author(s): Dr Heather Lamb, Professor Alastair Hawkins

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Abstract

YcbL has been annotated as either a metallo-β-lactamase or glyoxalase II (GLX2), both members of the zinc metallohydrolase superfamily, that contains many enzymes with a diverse range of activities. Here, we report crystallographic and biochemical data for Salmonella enterica serovar Typhimurium YcbL that establishes it as GLX2, which differs in certain structural and functional properties compared with previously known examples. These features include the insertion of an α-helix after residue 87 in YcbL and truncation of the C-terminal domain, which leads to the loss of some recognition determinants for the glutathione substrate. Despite these changes, YcbL has robust GLX2 activity. A further difference is that the YcbL structure contains only a single bound metal ion rather than the dual site normally observed for GLX2s. Activity assays in the presence of various metal ions indicate an increase in activity above basal levels in the presence of manganous and ferrous ions. Thus, YcbL represents a novel member of the GLX2 family.

Publication metadata

Author(s): Stamp AL, Owen P, Omari KE, Nichols CE, Lockyer M, Lamb HK, Charles IG, Hawkins AR, Stammers DK

Publication type: Article

Publication status: Published

Journal: Protein Science

Year: 2010

Volume: 19

Issue: 10

Pages: 1897-1905

Print publication date: 28/07/2010

ISSN (print): 0961-8368

ISSN (electronic): 1469-896X

Publisher: Wiley-Blackwell Publishing, Inc.

URL: http://dx.doi.org/10.1002/pro.475

DOI: 10.1002/pro.475

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