Abstract
The cysteine synthase gene ( cysK) from Flavobacterium K 3–15 was cloned and sequenced. The gene exhibits 30–50% identity to known cysteine synthases on both the DNA and the amino acid levels. The pyridoxal phosphate binding site of the enzyme is part of a conserved motif comprising seven amino acids (SIKDRIA). The lys31 residue of the flavobacterial enzyme is conserved in all known cysteine synthases. The cysK gene from Flavobacterium K 3–15 was heterologously expressed and the gene product identified by immunoblotting and determination of the enzyme activity.
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