NDLI: Membrane Topology of PssT, the Transmembrane Protein Component of the Type I Exopolysaccharide Transport System in Rhizobium leguminosarum bv. trifolii Strain TA1

Content Provider	PubMed Central
Author	Mazur, Andrzej Król, Jarosław E. Marczak, Małgorzata Anna, Skorupska
Copyright Year	2003
Abstract	The pssT gene was identified as the fourth gene located upstream of the pssNOP gene cluster possibly involved in the biosynthesis, polymerization, and transport of exopolysaccharide (EPS) in Rhizobium leguminosarum bv. trifolii strain TA1. The hydropathy profile and homology searches indicated that PssT belongs to the polysaccharide-specific transport family of proteins, a component of the type I system of the polysaccharide transport. The predicted membrane topology of the PssT protein was examined with a series of PssT-PhoA fusion proteins and a complementary set of PssT-LacZ fusions. The results generally support a predicted topological model for PssT consisting of 12 transmembrane segments, with amino and carboxyl termini located in the cytoplasm. A mutant lacking the C-terminal part of PssT produced increased amounts of total EPS with an altered distribution of high- and low-molecular-weight forms in comparison to the wild-type RtTA1 strain. The PssT mutant produced an increased number of nitrogen fixing nodules on clover.
Related Links	http://dx.doi.org/10.1128/jb.185.8.2503-2511.2003
Ending Page	2511
Page Count	9
Starting Page	2503
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	8
Volume Number	185
Language	English
Publisher	American Society for Microbiology
Publisher Date	2003-04-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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Membrane Topology of PssT, the Transmembrane Protein Component of the Type I Exopolysaccharide Transport System in Rhizobium leguminosarum bv. trifolii Strain TA1

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