Conserved protein; Could be a nuclease involved in processing of the 5'-end of pre-16S rRNA.

Probable alanyl-tRNA synthetase AlaS (alanine--tRNA ligase) (alanine translase) (ALARS); Catalyzes the attachment of alanine to tRNA(Ala) in a two- step reaction: alanine is first activated by ATP to form Ala-AMP and then transferred to the acceptor end of tRNA(Ala). Also edits incorrectly charged Ser-tRNA(Ala) and Gly-tRNA(Ala) via its editing domain; Belongs to the class-II aminoacyl-tRNA synthetase family.

Rv3017c, (MT3097, MTV012.31c), len: 120 aa. EsxQ,ESAT-6 like protein (see citation below), possibly secreted protein, very similar to AAK47433|MT3104 putative secreted ESAT-6 like protein 9 from Mycobacterium tuberculosis strain CDC1551 (96 aa), FASTA scores: opt: 315, E(): 1.2e-14, (65.7% identity in 70 aa overlap); Rv3019c|O53266|MTV012.33c putative secreted ESAT-6 like protein 9 from Mycobacterium tuberculosis (96 aa), FASTA scores: opt: 315, E(): 1.2e-14, (65.7% identity in 70 aa overlap) and Rv0288|O53693|CFP7|MT0301|MTV035.16 10 KDA antigen CFP7 (low molecular weight protein anti [...]

Rv1806, (MTV049.28), len: 99 aa. PE20, Member of the Mycobacterium tuberculosis PE family of gly-, ala-rich proteins (see citation below), most similar to Rv1788|MTV049.10|AL022021 (99 aa), FASTA scores: opt: 334,E(): 4.7 e-15, (59.8% identity in 97 aa overlap). This region is a possible MT-complex-specific genomic island (See Becq et al., 2007).

Rv3020c, (MTV012.34c), len: 97 aa. EsxS, ESAT-6 like protein. PE-family related protein; distant member of the Mycobacterium tuberculosis PE family, similar to AAK44524|MT0300 PE family protein from M. tuberculosis strain CDC1551 (97 aa), FASTA scores: opt: 564, E(): 5.9e-30, (91.75% identity in 97 aa overlap). Has potential helix-turn-helix motif at positions 14-35. Seems to belong to the ESAT6 family (see Betts et al., 2002). Note that previously known as PE28. A core mycobacterial gene; conserved in mycobacterial strains (See Marmiesse et al.,2004).

Rv3739c, (MTV025.087c), len: 77 aa. PPE67, Member of the Mycobacterium tuberculosis PE family, showing high homology with O53269|Rv3022c|MTV012.36c (82 aa) FASTA scores: opt: 398, E(): 1.2e-19, (74.0% identity in 77 aa overlap); and similar to the N-termini of other PPE proteins e.g. O53265|Rv3018c|MTV012.32c (434 aa) FASTA scores: opt: 398, E(): 4.8e-19, (74.0% identity in 77 aa overlap). ORF ends at the stop codon at position 97470,which is not present in similar ORFs: MTV012_32, or MTCY21B4_4. Sequence homology with MTV012_32, and MTCY21B4_4 continues in the downstream ORF MTV025.08 [...]

Probable protein TatB; Part of the twin-arginine translocation (Tat) system that transports large folded proteins containing a characteristic twin- arginine motif in their signal peptide across membranes. Together with TatC, TatB is part of a receptor directly interacting with Tat signal peptides. TatB may form an oligomeric binding site that transiently accommodates folded Tat precursor proteins before their translocation.

Rv3018A, len: 28 aa. PE27A, Member of Mycobacterium tuberculosis PE family (see Brennan and Delogu, 2002), most similar to Rv0285 (102 aa), FASTA scores: opt: 147, E(): 3.5e-05, (92.85% identity in 28 aa overlap); etc.

Rv3018c, (MTV012.32c), len: 434 aa. PPE46, Member of PPE family but lacks Gly, Ala rich repeats at C-terminal domain, closest to MTCY261.19. See citation below. Also very similar to following ORF MTV012.35c. Nearly identical in parts to Mycobacterium tuberculosis protein erroneously described as dihydrofolate reductase (X59271|MTFOLA_1) P31500|DYR_MYCTU (214 aa), FASTA scores: opt: 972, E(): 4.4e-42, (80.0% identity in 195 aa overlap); and Z97559|MTCY261_19 from Mycobacterium tuberculosis cosmid (473 aa), FASTA scores: opt: 806, E(): 0; (38.8% identity in 479 aa overlap); and O53268|MT [...]