7B1R image
Entry Detail
PDB ID:
7B1R
Keywords:
Title:
Crystal structure of B. subtilis glucose-1-phosphate uridylyltransferase YngB
Biological Source:
PDB Version:
Deposition Date:
2020-11-25
Release Date:
2021-02-10
Method Details:
Experimental Method:
Resolution:
2.80 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
I 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Probable UTP--glucose-1-phosphate uridylyltransferase YngB
Chain IDs:A, B
Chain Length:297
Number of Molecules:2
Biological Source:Bacillus subtilis subsp. subtilis str. 168
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Primary Citation
Bacillus subtilis YngB contributes to wall teichoic acid glucosylation and glycolipid formation during anaerobic growth.
J.Biol.Chem. 296 100384 100384 (2021)
PMID: 33556370 DOI: 10.1016/j.jbc.2021.100384

Abstact

UTP-glucose-1-phosphate uridylyltransferases are enzymes that produce UDP-glucose from UTP and glucose-1-phosphate. In Bacillus subtilis 168, UDP-glucose is required for the decoration of wall teichoic acid (WTA) with glucose residues and the formation of glucolipids. The B. subtilis UGPase GtaB is essential for UDP-glucose production under standard aerobic growth conditions, and gtaB mutants display severe growth and morphological defects. However, bioinformatics predictions indicate that two other UTP-glucose-1-phosphate uridylyltransferases are present in B. subtilis. Here, we investigated the function of one of them named YngB. The crystal structure of YngB revealed that the protein has the typical fold and all necessary active site features of a functional UGPase. Furthermore, UGPase activity could be demonstrated in vitro using UTP and glucose-1-phosphate as substrates. Expression of YngB from a synthetic promoter in a B. subtilis gtaB mutant resulted in the reintroduction of glucose residues on WTA and production of glycolipids, demonstrating that the enzyme can function as UGPase in vivo. When WT and mutant B. subtilis strains were grown under anaerobic conditions, YngB-dependent glycolipid production and glucose decorations on WTA could be detected, revealing that YngB is expressed from its native promoter under anaerobic condition. Based on these findings, along with the structure of the operon containing yngB and the transcription factor thought to be required for its expression, we propose that besides WTA, potentially other cell wall components might be decorated with glucose residues during oxygen-limited growth condition.

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