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Gene Review

CPA2  -  carbamoyl-phosphate synthase (glutamine...

Saccharomyces cerevisiae S288c

Synonyms: Arginine-specific carbamoyl-phosphate synthetase, ammonia chain, Carbamoyl-phosphate synthase arginine-specific large chain, J2002, YJR109C
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Disease relevance of CPA2

  • The protein sequence data provide strong evidence that the carbamyl phosphate synthetase I gene of rat, the carAB gene of E. coli, and the CPA1 and CPA2 genes of yeast were derived from common ancestral genes [1].
  • The hydrophobic, but not the hydrophilic, domain of plant CHX is remarkably similar to monovalent cation/proton antiporter-2 (CPA2) proteins, especially yeast (Saccharomyces cerevisiae) KHA1 and Synechocystis NhaS4 [2].
  • AIM: The effect of several nitrogen and carbon sources on the growth of Pantoea agglomerans (strain CPA-2) was studied for the first time [3].

High impact information on CPA2

  • One mechanism, the general control of amino acid biosynthesis, influences the expression of both CPA1 and CPA2 genes, the structural genes for the two subunits of the enzyme [4].
  • The correlation between ARG2 and CAR2 is found to change from positive to negative as the expression level of CPA2 increases [5].
  • The 5'-flanking regions of CPA1 (reported previously) and CPA2 determined in this study each contained at least two copies of the sequence TGACTC, shown to bind GCN4 protein [6].
  • CPA2 is composed of two apparently duplicated amino acid sequences involved in binding the two ATP molecules needed for carbamoyl phosphate synthesis and a carboxyl-terminal domain which appears to be less tightly folded than the remainder of the protein [7].
  • Using deletion mutagenesis, we have established that essentially all of the carboxyl-terminal domain of CPA2 is required for catalytic function and that even small truncations lead to significant changes in the CPA2 conformation [7].

Biological context of CPA2

  • Reports of characterized fungal and prokaryotic CPA2 indicate that they have various transport modes, including K(+)/H(+) (KHA1), Na(+)/H(+)-K(+) (GerN) antiport, and ligand-gated ion channel (KefC) [2].
  • The effect of nitrogen and carbon sources on growth of the biocontrol agent Pantoea agglomerans strain CPA-2 [3].

Associations of CPA2 with chemical compounds

  • Arginine deprivation imposed by PALO also caused increased expression of CPA1 and CPA2, coding respectively for the small and large subunits of arginine-specific carbamyl-phosphate synthetase [6].


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