Characterization of three genes in the dam-containing operon of Escherichia coli View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1995-09

AUTHORS

Anita Lyngstadaas, Anders Løbner-Olesen, Erik Boye

ABSTRACT

The dam-containing operon in Escherichia coli is located at 74 min on the chromosomal map and contains the genes aroK, aroB, a gene called urf74.3, dam and trpS. We have determined the nucleotide sequence between the dam and trpS genes and show that it encodes two proteins with molecular weights of 24 and 27 kDa. Furthermore, we characterize the three genes urf74.3, 24kDa, 27kDa and the proteins they encode. The predicted amino acid sequences of the 24 and 27 kDa proteins are similar to those of the CbbE and CbbZ proteins, respectively, of the Alcaligenes eutrophus cbb operon, which encodes enzymes involved in the Calvin cycle. In separate experiments, we have shown that the 24 kDa protein has d-ribulose-5-phosphate epimerase activity (similar to CbbE), and we call the gene rpe. Similarly, the 27 kDa protein has 2-phosphoglycolate phosphatase activity (similar to CbbZ), and we name the gene gph. The Urf74.3 protein, with a predicted molecular weight of 46 kDa, migrated as a 70 kDa product under denaturing conditions. Overexpression of Urf74.3 induced cell filamentation, indicating that Urf74.3 directly or indirectly interferes with cell division. We present evidence for translational coupling between aroB and urf74.3 and also between rpe and gph. Proteins encoded in the dam superoperon appear to be largely unrelated: Dam, and perhaps Urf74.3, are involved in cell cycle regulation, AroK, AroB, and TrpS function in aromatic amino acid biosynthesis, whereas Rpe and Gph are involved in carbohydrate metabolism. More... »

PAGES

546-554

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00290345

DOI

http://dx.doi.org/10.1007/bf00290345

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/7603433


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