RRC ID 80717
Author Kurihara S, Tsuboi Y, Oda S, Kim HG, Kumagai H, Suzuki H.
Title The putrescine Importer PuuP of Escherichia coli K-12.
Journal J Bacteriol
Abstract The Puu pathway is a putrescine utilization pathway involving gamma-glutamyl intermediates. The genes encoding the enzymes of the Puu pathway form a gene cluster, the puu gene cluster, and puuP is one of the genes in this cluster. In Escherichia coli, three putrescine importers, PotFGHI, PotABCD, and PotE, were discovered in the 1990s and have been studied; however, PuuP had not been discovered previously. This paper shows that PuuP is a novel putrescine importer whose kinetic parameters are equivalent to those of the polyamine importers discovered previously. A puuP(+) strain absorbed up to 5 mM putrescine from the medium, but a DeltapuuP strain did not. E. coli strain MA261 has been used in previous studies of polyamine transporters, but PuuP had not been identified previously. It was revealed that the puuP gene of MA261 was inactivated by a point mutation. When E. coli was grown on minimal medium supplemented with putrescine as the sole carbon or nitrogen source, only PuuP among the polyamine importers was required. puuP was expressed strongly when putrescine was added to the medium or when the puuR gene, which encodes a putative repressor, was deleted. When E. coli was grown in M9-tryptone medium, PuuP was expressed mainly in the exponential growth phase, and PotFGHI was expressed independently of the growth phase.
Volume 191(8)
Pages 2776-82
Published 2009-4-1
DOI 10.1128/JB.01314-08
PII JB.01314-08
PMID 19181795
PMC PMC2668393
MeSH Culture Media / chemistry Escherichia coli K12 / genetics Escherichia coli K12 / metabolism* Escherichia coli Proteins / genetics Escherichia coli Proteins / metabolism* Gene Deletion Gene Expression Profiling Kinetics Membrane Transport Proteins / genetics Membrane Transport Proteins / metabolism* Putrescine / metabolism*
IF 3.006
Prokaryotes E. coli ME9958 ME9959 ME9960 ME9961 ME9962 ME9963 ME9964