Rv0069c, (MTV030.12c), len: 461 aa. Probable sdaA,L-serine dehydratase. Belongs to the iron-sulfur dependent L-serine dehydratase family. Cofactor: iron-sulfur (4FE-4S) (probable).

Serine hydroxymethyltransferase 1 GlyA1; Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism. Thus, is able to catalyze the cleavage of L- allo-threonine; Belongs to the SHMT family.

Serine hydroxymethyltransferase GlyA2 (serine methylase 2) (SHMT 2); Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism. Thus, is able to catalyze the cleavage of L- allo-threonine; Belongs to the SHMT family.

Probable cystathionine beta-synthase Cbs (serine sulfhydrase) (beta-thionase) (hemoprotein H-450); Rv1077, (MTV017.30), len: 464 aa. Probable cbs (previously cysM2), cystathionine beta-synthase, similar throughout its length to many eukaryotic cystathionine beta-synthases e.g. P32232|CBS_RAT cystathionine beta-synthase (560 aa), FASTA scores: opt: 951, E(): 0,(40.2% identity in 450 aa overlap); also similar in N-terminal domain (aa 1 - 330) to Rv2334|MTCY98.03 CysK Mycobacterium tuberculosis (310 aa), FASTA scores: opt: 855, E(): 0, (46.8% identity in 314 overlap); and other cysteine s [...]

Tryptophan synthase, beta subunit TrpB; The beta subunit is responsible for the synthesis of L- tryptophan from indole and L-serine.

Probable threonine dehydratase IlvA; Catalyzes the anaerobic formation of alpha-ketobutyrate and ammonia from threonine in a two-step reaction. The first step involved a dehydration of threonine and a production of enamine intermediates (aminocrotonate), which tautomerizes to its imine form (iminobutyrate). Both intermediates are unstable and short-lived. The second step is the nonenzymatic hydrolysis of the enamine/imine intermediates to form 2- ketobutyrate and free ammonia. In the low water environment of the cell, the second step is accelerated by RidA (By similarity).

Probable tryptophan synthase, alpha subunit TrpA; The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate.

Probable serine acetyltransferase CysE (sat); Catalyzes the acetylation of serine by acetyl-CoA to produce O-acetylserine (OAS); Belongs to the transferase hexapeptide repeat family.

Rv0436c, (MTCY22G10.33c), len: 286 aa. Probable pssA, PS synthase (CDP-diacylglycerol--serine O-phosphatidyltransferase) (see citation below), integral membrane protein, equivalent to AL035159|MLCB1450_9|T44730 from Mycobacterium leprae (300 aa), FASTA scores: opt: 1506, E(): 0, (77.9% identity in 285 aa overlap). Also highly similar to others e.g. NP_108059.1|14027250|BAB54204.1|AP003012 phosphatidylserine synthase from Mesorhizobium loti (248 aa); PSS_BACSU|P39823 cdp-diacylglycerol--serine o-phosphatidyltransferase from Bacillus subtilis (177 aa), FASTA scores: opt: 277, E(): 9.9e-1 [...]