Updated annotation (from data): homoserine phosphotransferase HomK Rationale: Important for fitness in minimal medium unless threonine is added. Furthermore, this gene complements a strain of E. coli that lacks homoserine kinase (Valentine Trotter & Adam Deutschbauer). HomK (TIGR02535) are related to phosphoglycerate mutases, and the catalytic serine and metal-binding residues are conserved, so HomK must transfer a phosphate group from an unidentified donor to L-homoserine to form O-phospho-L-homoserine. The phosphate donor is not known, but we suspect phosphoserine or phosphoenopyruvate. Many genomes with this family lack glycerate kinase, so we do not expect that phosphoglycerate is the phosphate donor. Original annotation: phosphoglycerate mutase (NCBI ptt file) Type 1: Protein-coding gene Located on scaffold 241, - strand, nucleotides 2,997,809 to 2,999,032 See nucleotide sequence around BT2402 or for all of scaffold 241