Probable GMP synthase [glutamine-hydrolyzing] GuaA (glutamine amidotransferase) (GMP synthetase); Catalyzes the synthesis of GMP from XMP.

Adenine phosphoribosyltransferase; Catalyzes a salvage reaction resulting in the formation of AMP, that is energically less costly than de novo synthesis.

Rv3624c, (MTCY15C10.28), len: 216 aa. Hpt (alternate gene name: hprT), hypoxanthine-guanine phosphoribosyltransferase (but seems to have a 35 aa extension at N-terminus), equivalent to other mycobacterial hypoxanthine-guanine phosphoribosyltransferases e.g. P96794 from Mycobacterium avium (203 aa), FASTA scores: opt: 1136,E(): 1.2e-65, (88.5% identity in 200 aa overlap); and O69537|HPT|ML0214 from Mycobacterium leprae (213 aa), FASTA scores: opt: 1115, E(): 2.8e-64, (81.6% identity in 212 aa overlap). Also similar to others e.g. Q9X8I5|SCE9.12c from Streptomyces coelicolor (187 aa), FA [...]

Probable DNA/pantothenate metabolism flavoprotein homolog Dfp; Catalyzes two sequential steps in the biosynthesis of coenzyme A. In the first step cysteine is conjugated to 4'- phosphopantothenate to form 4-phosphopantothenoylcysteine. In the second step the latter compound is decarboxylated to form 4'- phosphopantotheine; In the N-terminal section; belongs to the HFCD (homo- oligomeric flavin containing Cys decarboxylase) superfamily.

Probable nucleoside diphosphate kinase NdkA (NDK) (NDP kinase) (nucleoside-2-P kinase); Major role in the synthesis of nucleoside triphosphates other than ATP. The ATP gamma phosphate is transferred to the NDP beta phosphate via a ping-pong mechanism, using a phosphorylated active-site intermediate; Belongs to the NDK family.

Rv1617, (MTCY01B2.09), len: 472 aa. Probable pykA,pyruvate kinase. FASTA best: Q46078 pyruvate kinase from corynebacterium glutamicum (475 aa), opt: 2221, E(): 0,(72.2% identity in 468 aa overlap). Belongs to the pyruvate kinase family. Phosphorylated in vitro by PknJ|Rv2088 (See Arora et al., 2010).

Rv1388, (MTCY21B4.05), len: 190 aa. Putative mihF,integration host factor. Almost identical to, but longer than, P96802|U75344 Mycobacterium smegmatis integration host factor (mIHF) for mycobacteriophage L5 (105 aa), FASTA scores: E(): 0, (96.1% identity in 102 aa overlap). A core mycobacterial gene; conserved in mycobacterial strains (See Marmiesse et al., 2004).

Guanosine-3',5'-bis(diphosphate) 3'-pyrophosphohydrolase; In eubacteria ppGpp (guanosine 3'-diphosphate 5-' diphosphate) is a mediator of the stringent response that coordinates a variety of cellular activities in response to changes in nutritional abundance. This enzyme catalyzes both the formation of pppGpp, which is then hydrolyzed to form ppGpp, as well as the hydrolysis of ppGpp. RelA is probably a key factor in the pathogenesis of M.tuberculosis as it regulates the intracellular concentrations of (p)ppGpp.

S-adenosylmethionine synthase; Catalyzes the formation of S-adenosylmethionine (AdoMet) from methionine and ATP. The overall synthetic reaction is composed of two sequential steps, AdoMet formation and the subsequent tripolyphosphate hydrolysis which occurs prior to release of AdoMet from the enzyme.