HHsearch alignment for GI: 255764481 and conserved domain: cd03354

>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.
Probab=98.98  E-value=1.8e-09  Score=79.72  Aligned_cols=43  Identities=21%  Similarity=0.485  Sum_probs=23.2

Q ss_pred             CCCCCCCCCCCCCCCCCEECCCEEECCCCCCCCCEEEECCCEEEC
Q ss_conf             012344322345245532148606523444336506404743501
Q gi|255764481|r  131 LGNGIVLSNNVMIAGHVIVDDRVVFGGGSAVHQFTRIGKYAFIGG  175 (271)
Q Consensus       131 IG~~vii~n~~~l~G~v~Igd~~~IG~~~~v~~~v~IG~~a~ig~  175 (271)
T Consensus        57 Ig~~v~IG~~~~I~~gv~IG~~~vIgagsvV~~--dv~~~si~~G   99 (101)
T cd03354          57 IGDNVVIGAGAKILGNITIGDNVKIGANAVVTK--DVPANSTVVG   99 (101)
T ss_pred             CCCCEEECCCCEEECCCEECCCCEECCCCEECC--CCCCCCEEEE
T ss_conf             487586358988929879999879987988996--8599989980