Alanine dehydrogenase NAD-binding and catalytic domains
Alanine dehydrogenase (L-AlaDH) catalyzes the NAD-dependent conversion of pyruvate to L-alanine via reductive amination. Like formate dehydrogenase and related enzymes, L-AlaDH is comprised of 2 domains connected by a long alpha helical stretch, each resembling a Rossmann fold NAD-binding domain. The NAD-binding domain is inserted within the linear sequence of the more divergent catalytic domain. Ligand binding and active site residues are found in the cleft between the subdomains. L-AlaDH is typically hexameric and is critical in carbon and nitrogen metabolism in micro-organisms.
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