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