HHsearch alignment for GI: 254780771 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=99.88  E-value=5.4e-23  Score=143.49  Aligned_cols=100  Identities=36%  Similarity=0.503  Sum_probs=84.0

Q ss_pred             CCEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCEEEEEEEEEECCCEECCCCEEEECCEEECCEEE
Q ss_conf             20000244445444433222222111112221112344446503577188655565036365697297306878378598
Q gi|254780771|r  218 RVIIQDKVEIGANSAIDRGTIDDTIIGENTKIDNQVQIGHNVHIGCGCIIVSQVGIAGSTYIGDNVLIGGQCGIAGYLKI  297 (347)
Q Consensus       218 ~v~Ig~~v~IG~n~tIdrg~~~~t~Ig~~~~id~~v~i~hn~~iG~~~~~~~~~~~~g~~~ig~~~~ig~~~~i~~~v~i  297 (347)
T Consensus         2 Gv~I~~~~~IG~~~~I~~~~--~v~Ig~~~~Ig~~~~I~~~~~ig~~~~~~----~~~~~~Ig~~v~IG~~~~I~~gv~I   75 (101)
T cd03354           2 GIDIHPGAKIGPGLFIDHGT--GIVIGETAVIGDNCTIYQGVTLGGKGKGG----GKRHPTIGDNVVIGAGAKILGNITI   75 (101)
T ss_pred             CCEECCCCEECCCEEECCCC--CEEECCCCEECCCCEECCCCEECCCCCCC----CCCCCCCCCCEEECCCCEEECCCEE
T ss_conf             62989999999492991998--77999998999998998887886631146----8777614875863589889298799


Q ss_pred             CCCCEECCCCEEEEEECCCCEEEEEC
Q ss_conf             88889862532600007987899824
Q gi|254780771|r  298 GDNVQIASKSGVLKDIPAGQQYGGMP  323 (347)
Q Consensus       298 g~~~~i~a~s~v~~~v~~~~~~~G~p  323 (347)
T Consensus        76 G~~~vIgagsvV~~dv~~~si~~G~P  101 (101)
T cd03354          76 GDNVKIGANAVVTKDVPANSTVVGVP  101 (101)
T ss_pred             CCCCEECCCCEECCCCCCCCEEEECC
T ss_conf             99879987988996859998998039