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J Bacteriol. 1990 Jul;172(7):3842-8.

Cloning, sequence, and expression of the pantothenate permease (panF) gene of Escherichia coli.

Author information

1
Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee.

Abstract

Pantothenate permease, the product of the panF gene, catalyzes the sodium-dependent uptake of extracellular pantothenate. The panF gene was isolated from an Escherichia coli genomic DNA library and subcloned into multicopy plasmids. Increased copy number of the panF+ allele resulted in increased rates of pantothenate uptake and a significant increase in the steady-state intracellular pantothenate concentration. Despite the higher levels of pantothenate, the utilization of pantothenate for coenzyme A formation was not elevated, indicating that pantothenate kinase activity is the dominant regulator of coenzyme A biosynthesis. DNA sequencing of the panF gene revealed the presence of a single open reading frame that encoded a hydrophobic protein with a molecular weight of 51,992. Sequence analysis predicts that pantothenate permease is an integral membrane protein possessing 12 hydrophobic membrane-spanning domains connected by short hydrophilic sequences. The predicted topological profile of pantothenate permease is similar to that of other membrane carriers that catalyze cation-dependent symport.

PMID:
2193919
PMCID:
PMC213365
[Indexed for MEDLINE]
Free PMC Article

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