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Cite: NAR/gkaa742 2020



PUL General Information

Literature Information

PUL ID

PUL0226

PubMed

23089617, Glycobiology. 2013 Feb;23(2):259-72. doi: 10.1093/glycob/cws146. Epub 2012 Oct 22.

Characterization method

Western Blot

Genomic accession number

U22511.1

Nucelotide position range

32-15282

Substrate

xanthan

Loci

gumA-M

Species

Xanthomonas campestris/339

Degradation or Biosynthesis

biosynthesis

Gene Name

Locus Tag

Protein ID

Gene Position

GenBank Contig Range

EC Number

gumA - AAA86369.1 32 - 332 (+) U22511.1:64-364 -
gumB - AAA86370.1 1333 - 1975 (+) U22511.1:1365-2007 -
gumC - AAA86371.1 2047 - 3398 (+) U22511.1:2079-3430 -
gumD - AAA86372.1 3639 - 5094 (+) U22511.1:3671-5126 -
gumE - AAA86373.1 5176 - 6475 (+) U22511.1:5208-6507 -
gumF - AAA86374.1 6471 - 7566 (+) U22511.1:6503-7598 -
gumG - AAA86375.1 7562 - 8702 (+) U22511.1:7594-8734 -
gumH - AAA86376.1 8698 - 9841 (+) U22511.1:8730-9873 -
gumI - AAA86377.1 9837 - 10887 (+) U22511.1:9869-10919 -
gumJ - AAA86378.1 10883 - 12380 (+) U22511.1:10915-12412 -
gumK - AAA86379.1 12759 - 13647 (+) U22511.1:12791-13679 -
gumL - AAA86380.1 13688 - 14483 (+) U22511.1:13720-14515 -
gumM - AAA86381.1 14490 - 15282 (+) U22511.1:14522-15314 -

Cluster number

1

Gene name

Gene position

Gene type

Found by CGCFinder?

- 33 - 332 (+) CDS No
- 1334 - 1975 (+) TC: gnl|TC-DB|B0RRH7|1.B.18.3.7 Yes
- 2048 - 3397 (+) TC: gnl|TC-DB|B0RRH8|8.A.3.1.3 Yes
- 3640 - 5094 (+) TC: gnl|TC-DB|G0CIY2|9.B.18.1.1 Yes
- 5177 - 6475 (+) TC: gnl|TC-DB|B0RRI0|9.B.30.1.1 Yes
- 6472 - 7566 (+) TC: gnl|TC-DB|B0RRI1|9.B.97.6.1 Yes
- 7563 - 8702 (+) TC: gnl|TC-DB|BoRRI2|9.B.97.6.2 Yes
- 8699 - 9841 (+) CAZyme: GT4 Yes
- 9838 - 10887 (+) CAZyme: GT94 Yes
- 10884 - 12380 (+) TC: gnl|TC-DB|B0RRI5|2.A.66.2.23 Yes
- 12760 - 13647 (+) CAZyme: GT70 Yes
- 13689 - 14483 (+) other Yes
- 14491 - 15282 (+) CAZyme: GT26 Yes

PUL ID

PUL0226

PubMed

23089617, Glycobiology. 2013 Feb;23(2):259-72. doi: 10.1093/glycob/cws146. Epub 2012 Oct 22.

Title

Xanthan chain length is modulated by increasing the availability of the polysaccharide copolymerase protein GumC and the outer membrane polysaccharide export protein GumB.

Author

Galvan EM, Ielmini MV, Patel YN, Bianco MI, Franceschini EA, Schneider JC, Ielpi L

Abstract

Xanthan is a polysaccharide secreted by Xanthomonas campestris that contains pentameric repeat units. The biosynthesis of xanthan involves an operon composed of 12 genes (gumB to gumM). In this study, we analyzed the proteins encoded by gumB and gumC. Membrane fractionation showed that GumB was mainly associated with the outer membrane, whereas GumC was an inner membrane protein. By in silico analysis and specific globomycin inhibition, GumB was characterized as a lipoprotein. By reporter enzyme assays, GumC was shown to contain two transmembrane segments flanking a large periplasmic domain. We confirmed that gumB and gumC mutant strains uncoupled the synthesis of the lipid-linked repeat unit from the polymerization process. We studied the effects of gumB and gumC gene amplification on the production, composition and viscosity of xanthan. Overexpression of GumB, GumC or GumB and GumC simultaneously did not affect the total amount or the chemical composition of the polymer. GumB overexpression did not affect xanthan viscosity; however, a moderate increase in xanthan viscosity was achieved when GumC protein levels were increased 5-fold. Partial degradation of GumC was observed when only that protein was overexpressed; but co-expression of GumB and GumC diminished GumC degradation and resulted in higher xanthan viscosity than individual GumB or GumC overexpression. Compared with xanthan from the wild-type strain, longer polymer chains from the strain that simultaneously overexpressed GumB and GumC were observed by atomic force microscopy. Our results suggest that GumB-GumC protein levels modulate xanthan chain length, which results in altered polymer viscosity.