Identification of a Novel Alpha(1-->6) Mannopyranosyltransferase MptB from Corynebacterium Glutamicum by Deletion of a Conserved Gene, NCgl1505, Affords a Lipomannan- and Lipoarabinomannan-deficient Mutant

Overview

Journal Mol Microbiol

Specialties Microbiology
Molecular Biology

Date 2008 May 3

PMID 18452585

Citations 34

Authors

Arun K Mishra

Luke J Alderwick

Doris Rittmann

Cindy Wang

Apoorva Bhatt

William R Jacobs Jr

Kuni Takayama

Lothar Eggeling

Gurdyal S Besra

Affiliations

Soon will be listed here.

Abstract

Mycobacterium tuberculosis and Corynebacterium glutamicum share a similar cell wall structure and orthologous enzymes involved in cell wall assembly. Herein, we have studied C. glutamicum NCgl1505, the orthologue of putative glycosyltransferases Rv1459c from M. tuberculosis and MSMEG3120 from Mycobacterium smegmatis. Deletion of NCgl1505 resulted in the absence of lipomannan (Cg-LM-A), lipoarabinomannan (Cg-LAM) and a multi-mannosylated polymer (Cg-LM-B) based on a 1,2-di-O-C(16)/C(18:1)-(alpha-D-glucopyranosyluronic acid)-(1-->3)-glycerol (GlcAGroAc(2)) anchor, while syntheses of triacylated-phosphatidyl-myo-inositol dimannoside (Ac(1)PIM(2)) and Man(1)GlcAGroAc(2) were still abundant in whole cells. Cell-free incubation of C. glutamicum membranes with GDP-[(14)C]Man established that C. glutamicum synthesized a novel alpha(1-->6)-linked linear form of Cg-LM-A and Cg-LM-B from Ac(1)PIM(2) and Man(1)GlcAGroAc(2) respectively. Furthermore, deletion of NCgl1505 also led to the absence of in vitro synthesized linear Cg-LM-A and Cg-LM-B, demonstrating that NCgl1505 was involved in core alpha(1-->6) mannan biosynthesis of Cg-LM-A and Cg-LM-B, extending Ac(1)PI[(14)C]M(2) and [(14)C]Man(1)GlcAGroAc(2) primers respectively. Use of the acceptor alpha-D-Manp-(1-->6)-alpha-D-Manp-O-C(8) in an in vitro cell-free assay confirmed NCgl1505 as an alpha(1-->6) mannopyranosyltransferase, now termed MptB. While Rv1459c and MSMEG3120 demonstrated similar in vitroalpha(1-->6) mannopyranosyltransferase activity, deletion of the Rv1459c homologue in M. smegmatis did not result in loss of mycobacterial LM/LAM, indicating a functional redundancy for this enzyme in mycobacteria.

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