Unknown

Dataset Information

0

Structural and enzymatic analysis of MshA from Corynebacterium glutamicum: substrate-assisted catalysis.


ABSTRACT: The glycosyltransferase termed MshA catalyzes the transfer of N-acetylglucosamine from UDP-N-acetylglucosamine to 1-L-myo-inositol-1-phosphate in the first committed step of mycothiol biosynthesis. The structure of MshA from Corynebacterium glutamicum was determined both in the absence of substrates and in a complex with UDP and 1-L-myo-inositol-1-phosphate. MshA belongs to the GT-B structural family whose members have a two-domain structure with both domains exhibiting a Rossman-type fold. Binding of the donor sugar to the C-terminal domain produces a 97 degrees rotational reorientation of the N-terminal domain relative to the C-terminal domain, clamping down on UDP and generating the binding site for 1-L-myo-inositol-1-phosphate. The structure highlights the residues important in binding of UDP-N-acetylglucosamine and 1-L-myo-inositol-1-phosphate. Molecular models of the ternary complex suggest a mechanism in which the beta-phosphate of the substrate, UDP-N-acetylglucosamine, promotes the nucleophilic attack of the 3-hydroxyl group of 1-L-myo-inositol-1-phosphate while at the same time promoting the cleavage of the sugar nucleotide bond.

SUBMITTER: Vetting MW 

PROVIDER: S-EPMC2414306 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature

altmetric image

Publications

Structural and enzymatic analysis of MshA from Corynebacterium glutamicum: substrate-assisted catalysis.

Vetting Matthew W MW   Frantom Patrick A PA   Blanchard John S JS  

The Journal of biological chemistry 20080404 23


The glycosyltransferase termed MshA catalyzes the transfer of N-acetylglucosamine from UDP-N-acetylglucosamine to 1-L-myo-inositol-1-phosphate in the first committed step of mycothiol biosynthesis. The structure of MshA from Corynebacterium glutamicum was determined both in the absence of substrates and in a complex with UDP and 1-L-myo-inositol-1-phosphate. MshA belongs to the GT-B structural family whose members have a two-domain structure with both domains exhibiting a Rossman-type fold. Bind  ...[more]

Similar Datasets

| S-EPMC5418603 | biostudies-literature
| S-EPMC2988379 | biostudies-literature
| S-EPMC9797636 | biostudies-literature
| S-EPMC201676 | biostudies-other
| S-EPMC3190824 | biostudies-literature
| S-EPMC5913818 | biostudies-literature
| S-EPMC6850760 | biostudies-literature
| S-EPMC10772564 | biostudies-literature
| S-EPMC4979012 | biostudies-literature
| S-EPMC207545 | biostudies-other