RPSBLAST alignment for GI: 254780771 and conserved domain: cd03354

>gnl|CDD|100045 cd03354, LbH_SAT, Serine acetyltransferase (SAT): SAT catalyzes the CoA-dependent acetylation of the side chain hydroxyl group of L-serine to form O-acetylserine, as the first step of a two-step biosynthetic pathway in bacteria and plants leading to the formation of L-cysteine. This reaction represents a key metabolic point of regulation for the cysteine biosynthetic pathway due to its feedback inhibition by cysteine. The enzyme is a 175 kDa homohexamer, composed of a dimer of homotrimers. Each subunit contains an N-terminal alpha helical region and a C-terminal left-handed beta-helix (LbH) subdomain with 5 turns, each containing a hexapeptide repeat motif characteristic of the acyltransferase superfamily of enzymes. The trimer interface mainly involves the C-terminal LbH subdomain while the dimer (of trimers) interface is mediated by the N-terminal alpha helical subdomain.. Length = 101
 Score = 54.4 bits (132), Expect = 5e-08
 Identities = 37/103 (35%), Positives = 49/103 (47%), Gaps = 6/103 (5%)

Query: 221 IQDKVEIGANSAIDRGTIDDTIIGENTKIDNQVQIGHNVHIGCGCIIVSQVGIAGSTYIG 280
           I    +IG    ID GT    +IGE   I +   I   V +G       + G      IG
Sbjct: 5   IHPGAKIGPGLFIDHGT--GIVIGETAVIGDNCTIYQGVTLG----GKGKGGGKRHPTIG 58

Query: 281 DNVLIGGQCGIAGYLKIGDNVQIASKSGVLKDIPAGQQYGGMP 323
           DNV+IG    I G + IGDNV+I + + V KD+PA     G+P
Sbjct: 59  DNVVIGAGAKILGNITIGDNVKIGANAVVTKDVPANSTVVGVP 101