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Nucleic Acids Research, 1984, Vol. 12, No. 15 6277-6289
© 1984

MOLECULAR BIOLOGY

Evolutionary divergence of genes for ornithine and aspartate carbamoyl-trasferases-complete sequence and mode of regulatio of the Escherichia coli argF gene; comparison of argF with argI and pyrB

F. Van Vliet1, R. Cunin1, A. Jacobs1, J. Piette1, D. Gigot3, M. Lauwereys2, A. Piérard3,4 and N. Glansdorff1,4

1Erfelijkheidsleer en Microbiologie 1, ave. E. Gryson, B-1070 Brussels, Belgium 2Chemie der Proteinen, Vrije Universiteit Brussel 1, ave. E. Gryson, B-1070 Brussels, Belgium 3Microbiologie, Université Libre de Bruxelles 1, ave. E. Gryson, B-1070 Brussels, Belgium 4Research institute of the CERIA-COOVI 1, ave. E. Gryson, B-1070 Brussels, Belgium

Received May 17, 1984. Revised July 6, 1984. Accepted July 6, 1984.

The complete nucleotide sequence of argF is presented, together with that of an operator-constitutive mutant. ArgF is compared with the other gene coding for ornithine carbamoyltransferase (OTCase) in E. coli K-12, argI, and with pyrB, encoding the catalytic monomer of aspartate carbamoyltransferase (ATCase). ArgF and argI appear very closely related having emerged from a relatively recent ancestor gene. The relationship between OTCase and ATCase appears more distant. Nevertheless, the homology observed between the two proteins (mainly in the polar domain) suggests a common origin.


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