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pubmed-article:16593937pubmed:abstractTextProduction of extracellular polysaccharide by the marine bacterium Pseudomonas atlantica is a variable trait. Strains that produce extracellular polysaccharide (EPS(+)) have a mucoid colony phenotype, but during cultivation in the laboratory nonmucoid, EPS(-) variants arise that have a crenated colony morphology. This change is reversible since crenated variants rapidly switch to the original mucoid phenotype. We have cloned the locus (eps) controlling variable expression of EPS production by screening a recombinant cosmid library for clones that restore EPS production in the crenated variant. By using eps as a probe of genomic structure in variant strains, expression of EPS production was found to be controlled by a specific DNA rearrangement. Insertion of a 1.2-kilobase-pair DNA sequence in the eps locus results in EPS(-), whereas excision of the sequence restores the EPS(+) phenotype. Properties of the rearrangement suggest the involvement of a mobile genetic element. The possible significance of this DNA rearrangement to the survival of P. atlantica in the ocean is discussed.lld:pubmed
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pubmed-article:16593937pubmed:authorpubmed-author:SilvermanMMlld:pubmed
pubmed-article:16593937pubmed:authorpubmed-author:BartlettD HDHlld:pubmed
pubmed-article:16593937pubmed:authorpubmed-author:WrightM EMElld:pubmed
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pubmed-article:16593937pubmed:volume85lld:pubmed
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pubmed-article:16593937pubmed:pagination3923-7lld:pubmed
pubmed-article:16593937pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16593937pubmed:year1988lld:pubmed
pubmed-article:16593937pubmed:articleTitleVariable expression of extracellular polysaccharide in the marine bacterium Pseudomonas atlantica is controlled by genome rearrangement.lld:pubmed
pubmed-article:16593937pubmed:affiliationThe Agouron Institute, 505 Coast Boulevard South, La Jolla, CA 92037.lld:pubmed
pubmed-article:16593937pubmed:publicationTypeJournal Articlelld:pubmed
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