HHsearch alignment for GI: 254780781 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=98.74  E-value=2e-08  Score=72.17  Aligned_cols=84  Identities=30%  Similarity=0.376  Sum_probs=58.4

Q ss_pred             CEECCCCCCCCCCEEE-CC--EEECCCCCCCCCCCCCCCEECCEE--------EECCCCEEECCCEECCEECCCCCCCEE
Q ss_conf             3103564006651462-01--030235336772015661232204--------730686881232112100577656448
Q gi|254780781|r  115 TIVRHSAYIGPKAVLM-PS--FVNMGAYIGEGSMIDTWSTVGSCA--------QIGKNVHISGGVGIGGVLEPIQTGPTI  183 (285)
Q Consensus       115 a~vr~ga~Ig~g~vim-p~--~VniGA~Ig~gt~I~~~a~IG~~a--------~IG~~vhI~~g~~IGGvlep~~a~pvi  183 (285)
T Consensus         3 v~I~~~~~IG~~~~I~~~~~v~Ig~~~~Ig~~~~I~~~~~ig~~~~~~~~~~~~Ig~~v~IG~~~~I~--------~gv~   74 (101)
T cd03354           3 IDIHPGAKIGPGLFIDHGTGIVIGETAVIGDNCTIYQGVTLGGKGKGGGKRHPTIGDNVVIGAGAKIL--------GNIT   74 (101)
T ss_pred             CEECCCCEECCCEEECCCCCEEECCCCEECCCCEECCCCEECCCCCCCCCCCCCCCCCEEECCCCEEE--------CCCE
T ss_conf             29899999994929919987799999899999899888788663114687776148758635898892--------9879


Q ss_pred             ECCCCEEECCCEEECCEEECCCCEE
Q ss_conf             7258478218578468884588566
Q gi|254780781|r  184 IEDNCFIGARSEIVEGCIIREGSVL  208 (285)
Q Consensus       184 IeD~v~IGa~s~I~~Gv~Ig~gavI  208 (285)
T Consensus        75 IG~~~vIgagsvV~~dv--~~~si~   97 (101)
T cd03354          75 IGDNVKIGANAVVTKDV--PANSTV   97 (101)
T ss_pred             ECCCCEECCCCEECCCC--CCCCEE
T ss_conf             99987998798899685--999899