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Pubmed ID :6086650
Publication Date : //

Sequence of the small subunit of yeast carbamyl phosphate synthetase and identification of its catalytic domain.


The yeast gene CPA1 coding for the small subunit of arginine-specific carbamyl phosphate synthetase has been cloned by complementation of a cpa 1 mutant with a plasmid library of total yeast chromosomal DNA. Two of the plasmids, pJL113/ST4 and pJL113/ST15, contain DNA inserts in opposite orientations with overlapping sequences of 2.6 kilobases. The nucleotide sequence of a 2.2-kilobase region of the DNA insert carrying the CPA1 gene has been determined. The CPA1 gene has been identified to be 1233 nucleotides long and to code for a polypeptide of 411 amino acids with a calculated molecular weight of 45,358. The amino acid sequence encoded in CPA1 is homologous to the recently determined sequence of the small subunit of Escherichia coli carbamyl phosphate synthetase (Piette, J., Nyunoya, H., Lusty, C.J., Cunin, R., Weyens, G., Crabeel, M., Charlier, D., Glandsdorff, N., and Pierard, A. (1984) Proc. Natl. Acad. Sci. U.S.A. 81, 4134-4138) over the entire length of the polypeptide chain. Comparison of the amino acid sequences of the small subunits of yeast and E. coli carbamyl phosphate synthetases to the sequences of Component II of anthranilate and p-aminobenzoate synthases suggests that these amidotransferases are evolutionarily related. The most highly conserved region of the yeast and E. coli enzymes includes a cysteine residue previously found to be at the active site of Pseudomonas putida anthranilate synthase Component II (Kawamura, M., Keim, P.S., Goto, Y., Zalkin, H., and Heinrikson, R.L. (1978) J. Biol. Chem. 253, 4659-4668). Based on the observed homologies in the primary sequences of the other amidotransferases examined, we propose a 13-amino acid long sequence to be part of the catalytic domain of this class of enzymes.

Authors : Nyunoya H , Lusty C J ,

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