L-serine = NH4(+) + pyruvate Carbohydrate biosynthesis; gluconeogenesis. Belongs to the serine/threonine dehydratase family. Could be the product of a pseudogene unlikely to encode a functional protein. This is a truncated version of L-serine dehydratase. Strain S288c has a stop codon in position 128, which disrupts the gene coding for this protein and produces two ORFs YIL167W and YIL168W. Because of that it is not part of the S.cerevisiae S288c complete/reference proteome set. A contiguous sequence for L-serine dehydratase can be found in other strain backgrounds (AC P0CF23).