1887

Abstract

The strain 168 chromosomal region extending from 109† to 112° has been sequenced. Among the 35 ORFs identified, and were the only genes that had been previously mapped and sequenced. Out of ten ORFs belonging to a single putative transcription unit, seven are probably involved in hexuronate catabolism. Their sequences are homologous to genes and , which are all required for the uptake of free -glucuronate, -galacturonate and β-glucuronide, and their transformation into glyceraldehyde 3-phosphate and pyruvate via 2-keto-3-deoxygluconate. The remaining three ORFs encode two dehydrogenases and a transcriptional regulator. The operon is preceded by a putative catabolite-responsive element (CRE), located between a hypothetical promoter and the RBS of the first gene. This element, the longest and the only so far described that is fully symmetrical, consists of a 26 bp palindrome matching the theoretical CRE sequence. The remaining predicted amino acid sequences that share homologies with other proteins comprise: a cytochrome P-450, a glycosyltransferase, an ATP-binding cassette transporter, a protein similar to the formate dehydrogenase α-subunit (FdhA), a protein similar to NADH dehydrogenases, and three homologues of polypeptides that have undefined functions.

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1998-04-01
2024-04-26
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