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Journal articles
Molecular Recognition and Interfacial Catalysis by the Essential Phosphatidylinositol Mannosyltransferase PimA from Mycobacteria
Abstract : Mycobacterial phosphatidylinositol mannosides (PIMs) and metabolically derived cell wall lipoglycans play important roles in host-pathogen interactions, but their biosynthetic pathways are poorly understood. Here we focus on Mycobacterium smeg-matis PimA, an essential enzyme responsible for the initial man-nosylation of phosphatidylinositol. The structure of PimA in complex with GDP-mannose shows the two-domain organization and the catalytic machinery typical of GT-B glycosyltrans-ferases. PimA is an amphitrophic enzyme that binds mono-disperse phosphatidylinositol, but its transferase activity is stimulated by high concentrations of non-substrate anionic sur-factants, indicating that the early stages of PIM biosynthesis involve lipid-water interfacial catalysis. Based on structural, cal-orimetric, and mutagenesis studies, we propose a model wherein PimA attaches to the membrane through its N-terminal domain, and this association leads to enzyme activation. Our results reveal a novel mode of phosphatidylinositol recognition and provide a template for the development of potential anti-mycobacterial compounds.
Cited literature [51 references]
https://hal-pasteur.archives-ouvertes.fr/pasteur-02554110
Contributor : Alejandro Buschiazzo <>
Submitted on : Saturday, April 25, 2020 - 12:16:51 AM
Last modification on : Wednesday, March 24, 2021 - 11:42:02 AM
Contributor : Alejandro Buschiazzo <>
Submitted on : Saturday, April 25, 2020 - 12:16:51 AM
Last modification on : Wednesday, March 24, 2021 - 11:42:02 AM
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