Abstract
Recombinant CMP-sialic acid synthetase, cloned from Streptococcus agalactiae serotype V strain 2603 V/R, is bifunctional having both CMP-sialic acid synthetase and acetylhydrolase (acylesterase) activities. The enzyme is active over a wide pH range with an optimal CMP-sialic acid synthetase activity at pH 9.0 and an optimal acetylhydrolase activity at pH 8.0. A metal cofactor (either Mg(2+) or Mn(2+)) is required for the CMP-sialic acid synthetase activity but is not for acetylhydrolase activity. Both catalytic functions, however, are impaired by high concentrations of Mn(2+).
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