Subsystem: Synthesis of osmoregulated periplasmic glucans

This subsystem's description is:

Osmoregulated periplasmic glucans (OPGs) are oligosaccharides made of a limited number of units (524); D-glucose is the only constituent sugar; and glucose units are linked, at least partially, by β-glycosidic bonds. OPG concentration in the periplasm increases in response to a decrease of environmental osmolarity.

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DiagramFunctional RolesSubsystem SpreadsheetDescriptionAdditional Notes 

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Taxonomy Pattern 
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MdoHMdoGMdoCMdoBMdoDNdvANdvBCgmBOpgC
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Osmoregulated periplasmic glucans (OPGs) are oligosaccharides made of a limited number of units (524); D-glucose is the only constituent sugar; and glucose units are linked, at least partially, by β-glycosidic bonds. OPG concentration in the periplasm increases in response to a decrease of environmental osmolarity.
Synthesis of the OPG backbone is carried out by the products of 2 genes (mdoG and mdoH, in E. coli and relatives; ndvB and ndvA in S. meliloti and relatives).
MdoH catalizes production of linear β-1,2 polyglucose chains from the precursor UDP-glucose. MdoG's function is unclear but it is necessary to the polymerization.
A paralog of mdoG in E. coli, ydcG, now called mdoD, encodes a protein that alters the size of the glucose backbone.
The backbone can be modified by phosphoglycerol (by the MdoB protein in E. coli and the CgmB protein in S. meliloti) or succinylation (by the MdoC protein in E. coli and OpgC in S. meliloti).