PE family protein PE5; Important for the siderophore-mediated iron-acquisition function of ESX-3. May play a pivotal role in the evasion of host immune response by M.tuberculosis. Mediates production of IL-10 via activation of the p38 and ERK1/2 mitogen-activated protein kinase (MAPK) signaling pathways.

Bifunctional enzyme MbtA: salicyl-AMP ligase (SAL-AMP ligase) + salicyl-S-ArCP synthetase; Involved in the initial steps of the mycobactin biosynthetic pathway. Catalyzes the salicylation of the aryl carrier protein (ArCP) domain of MbtB through a two-step reaction. The first step is the ATP- dependent adenylation of salicylate to generate a salicyl-AMP intermediate. The second step is the transfer of this activated salicylate to MbtB to form a salicyl-ArCP domain thioester.

Rv2120c, (MTCY261.16c), len: 160 aa. Probable conserved integral membrane protein, similar to many.

Phosphoribosyl-AMP pyrophosphatase HisE; Rv2122c, (MTCY261.18), len: 93 aa. HisE (alternate gene name: irg1), phosphoribosyl-AMP cyclohydrolase (see citation below), similar to many. Note that previously misnamed hisI.

ATP phosphoribosyltransferase HisG; Catalyzes the condensation of ATP and 5-phosphoribose 1- diphosphate to form N'-(5'-phosphoribosyl)-ATP (PR-ATP). Has a crucial role in the pathway because the rate of histidine biosynthesis seems to be controlled primarily by regulation of HisG enzymatic activity (By similarity).

Rv3402c, (MTCY78.26), len: 412 aa. Conserved hypothetical protein, probably involved in cell process,similar to various proteins generally involved in extracellular compounds (lipopolysaccharide O-antigen) biosynthesis e.g. O68392|RFBE perosamine synthetase from Brucella melitensis (367 aa), FASTA scores: opt: 420, E(): 1.2e-19, (26.15% identity in 375 aa overlap); Q9L6C1 3,4-dehydratase-like protein from Streptomyces antibioticus (393 aa), FASTA scores: opt: 419, E(): 1.5e-19, (30.65% identity in 385 aa overlap); Q9RR26|OLENI dehydratase from Streptomyces antibioticus (393 aa), FASTA [...]

Possible heme degrading protein MhuD; Catalyzes the oxidative degradation of the heme macrocyclic porphyrin ring in the presence of a suitable electron donor such as ascorbate or NADPH--cytochrome P450 reductase, with subsequent release of free iron.

ESX-3 secretion system protein EccD3; Part of the ESX-3 specialized secretion system, which is important for iron and zinc uptake or homeostasis.

ESAT-6 like protein EsxG (conserved protein TB9.8); EsxG, in complex with EsxH, disrupts ESCRT function and impairs host phagosome maturation, thereby promoting intracellular bacterial growth. The complex acts by interacting, via EsxH, with the host hepatocyte growth factor-regulated tyrosine kinase substrate (HGS/HRS), a component of the ESCRT machinery. EsxG stabilizes EsxH in the host cytosol.