Rv2758c (vapB21)

Current annotations:
- TBCAP: (community-based annotations - see table at bottom of page)
- TBDB: antitoxin
- REFSEQ: hypothetical protein
- PATRIC: FIG00821100: hypothetical protein
- TUBERCULIST: Possible antitoxin VapB21
- NCBI: Possible antitoxin VapB21
- updated information (H37Rv4):
  - gene name: vapB21
  - function:
  - reference:
Type: Conditional
Start: 3070583
End: 3070849
Operon:

Trans-membrane region:
Role: V - Conserved hypotheticals
GO terms:
- GO:0045927 - positive regulation of growth (Uniprot)
Reaction(s) (based on iSM810 metabolic model):
Gene Expression Profile (Transcriptional Responses to Drugs; Boshoff et al, 2004)
Gene Modules extracted from cluster analysis of 249 transcriptomic datasets using ICA
Orthologs among selected mycobacteria
Protein structure:
Search for Homologs in PDB
Top 10 Homologs in PDB (as of Nov 2020): (none with >35% aa id)
Links to additional information on vapB21:
- TBDB (updated)
- Phyre2 structure prediction, model: final.casp.pdb (from Mao et al, 2013)
- UniProt
- AlphaFold model
- Vulnerability = 0.084 (from Jeremy Rock's lab)
- KEGG - nucleotide and amino acid sequences of gene
- Mycobrowser
- PATRIC
- BioCyc
- Systems Biology

Amino Acid Sequence

MHRGYALVVCSPGVTRTMIDIDDDLLARAAKELGTTTKKDTVHAALRAALRASAARSLMNRMAENATGTQDEALVNAMWRDGHPENTA

(Nucleotide sequence available on KEGG)

Additional Information

Analysis of Positive Selection in Clinical Isolates new

Analysis of dN/dS (omega) in two collections of Mtb clinical isolates using GenomegaMap (Window model) (see description of methods)
- Moldova: 2,057 clinical isolates
- global set: 5,195 clinical isolates from 15 other countries
In the omega plots, the black line shows the mean estimate of omega (dN/dS) at each codon, and the blue lines are the bounds for the 95% credible interval (95%CI, from MCMC sampling).
A gene is under significant positive selection if the lower-bound of the 95%CI of omega (lower blue line) exceeds 1.0 at any codon.

	Moldova (2,057)	global set (5,195)
under significant positive selection?	NO	NO
omega peak height (95%CI lower bound)	1.65 (0.42)	2.72 (0.89)
codons under selection
omega plots
genetic variants*	link	link
statistics at each codon	link	link

* example format for variants: "D27 (GAC): D27H (CAC,11)" means "Asp27 (native codon GAC) mutated to His (codon CAC) in 11 isolates"

ESSENTIALITY

MtbTnDB - interactive tool for exploring a database of published TnSeq datasets for Mtb

TnSeqCorr - genes with correlated TnSeq profiles across ~100 conditions

Rv2758c/vapB21, gene len: 266 bp, num TA sites: 6

condition	dataset	call	medium	method	notes
in-vitro	DeJesus 2017 mBio	non-essential	7H9	HMM	fully saturated, 14 TnSeq libraries combined
in-vitro	Sassetti 2003 Mol Micro	non-essential	7H9	TRASH	essential if hybridization ratio<0.2
in-vivo (mice)	Sassetti 2003 PNAS	non-essential	BL6 mice	TRASH	essential if hybridization ratio<0.4, min over 4 timepoints (1-8 weeks)
in-vitro (glycerol)	Griffin 2011 PPath	too short	M9 minimal+glycerol	Gumbel	2 replicates; Padj<0.05
in-vitro (cholesterol)	Griffin 2011 PPath	too short	M9 minimal+cholesterol	Gumbel	3 replicates; Padj<0.05
differentially essential in cholesterol	Griffin 2011 PPath	NO (LFC=0.44)	cholesterol vs glycerol	resampling-SR	YES if Padj<0.05, else not significant; LFC<0 means less insertions/more essential in cholesterol
in-vitro	Smith 2022 eLife	non-essential	7H9	HMM	6 replicates (raw data in Subramaniam 2017, PMID 31752678)
in-vivo (mice)	Smith 2022 eLife	non-essential	BL6 mice	HMM	6 replicates (raw data in Subramaniam 2017, PMID 31752678)
differentially essential in mice	Smith 2022 eLife	NO (LFC=-1.063)	in-vivo vs in-vitro	ZINB	YES if Padj<0.05, else not significant; LFC<0 means less insertions/more essential in mice
in-vitro (minimal)	Minato 2019 mSys	non-essential	minimal medium	HMM
in-vitro (YM rich medium)	Minato 2019 mSys	non-essential	YM rich medium	HMM	7H9 supplemented with ~20 metabolites (amino acids, cofactors)
differentially essential in YM rich medium	Minato 2019 mSys	NO (LFC=0.57)	YM rich vs minimal medium	resampling

TnSeq Data No data currently available.

No TnSeq data currently available for this Target.

RNASeq Data No data currently available.

No RNA-Seq data currently available for this Target.

Metabolomic Profiles No data currently available.

No Metabolomic data currently available for this Target.

Proteomic Data No data currently available.

No Proteomic data currently available for this Target.

Regulatory Relationships from Systems Biology

BioCyc

Gene interactions based on ChIPSeq and Transcription Factor Over-Expression (TFOE) (Systems Biology)

NOTE: Green edges represent the connected genes being classified as differentially essential as a result of the middle gene being knocked out. These interactions are inferred based on RNASeq.

Interactions based on ChIPSeq data

Binds To:
- No bindings to other targets were found.
Bound By:

Interactions based on ChIPSeq data (Minch et al. 2014)

Binds To:
- No bindings to other targets were found.
Bound By:
- Rv0047c (-) (Direct binding)
- Rv3246c (mtrA) (Direct binding)

Interactions based on TFOE data (Rustad et al. 2014)

Upregulates:
- Does not upregulate other genes.
Upregulated by:
- Not upregulated by other genes.
Downregulates:
- Does not downregulate other genes.
Downregulated by:

Property	Value	Creator	Evidence	PMID	Comment
Interaction	Inhibits Rv2757c	vizhi.gurusamy	IEP		Co-expression (Functional linkage) authors,VL. Arcus,PB. Rainey,SJ. Turner The PIN-domain toxin-antitoxin array in mycobacteria. Trends Microbiol. 2005
Interaction	Inhibits Rv2757c	vizhi.gurusamy	IEP		Co-expression (Functional linkage) authors,A. Gupta Killing activity and rescue function of genome-wide toxin-antitoxin loci of Mycobacterium tuberculosis. FEMS Microbiol. Lett. 2009
Citation	Toxin-antitoxin loci are highly abundant in free-living but lost from host-associated prokaryotes. authors,DP. Pandey,K. Gerdes Nucleic Acids Res. 2005	vizhi.gurusamy	IEP	15718296	Co-expression (Functional linkage)
Interaction	Inhibits Rv2757c	vizhi.gurusamy	IEP		Co-expression (Functional linkage) authors,DP. Pandey,K. Gerdes Toxin-antitoxin loci are highly abundant in free-living but lost from host-associated prokaryotes. Nucleic Acids Res. 2005
Citation	The PIN-domain toxin-antitoxin array in mycobacteria. authors,VL. Arcus,PB. Rainey,SJ. Turner Trends Microbiol. 2005	vizhi.gurusamy	IEP	15993073	Co-expression (Functional linkage)
Interaction	Inhibits Rv2757c	vizhi.gurusamy	IEP		Co-expression (Functional linkage) authors,VL. Arcus,PB. Rainey,SJ. Turner The PIN-domain toxin-antitoxin array in mycobacteria. Trends Microbiol. 2005
Symbol	VapB21	jlew			We report the heterologous toxicity of these TA loci in Escherichia coli and show that only a few of the M. tuberculosis-encoded toxins can inhibit E. coli growth and have a killing effect. This killing effect can be suppressed by coexpression of the cognate antitoxin. authors,A. Gupta Killing activity and rescue function of genome-wide toxin-antitoxin loci of Mycobacterium tuberculosis. FEMS Microbiol. Lett. 2009
Citation	Killing activity and rescue function of genome-wide toxin-antitoxin loci of Mycobacterium tuberculosis. authors,A. Gupta FEMS Microbiol. Lett. 2009	jlew		19016878	We report the heterologous toxicity of these TA loci in Escherichia coli and show that only a few of the M. tuberculosis-encoded toxins can inhibit E. coli growth and have a killing effect. This killing effect can be suppressed by coexpression of the cognate antitoxin.
Other	stop:3070849	rslayden			MTCY48.05c (72 aa), FASTA scores: opt: 106, E(): 0.52, (39.15% identity in 46 aa overlap); O06565
Other	strand:+	rslayden			MTCY48.05c (72 aa), FASTA scores: opt: 106, E(): 0.52, (39.15% identity in 46 aa overlap); O06565
Symbol	Vap BC-21	rslayden			Rv1113
Other	start:3070583	rslayden			Rv1113
Other	stop:3070849	rslayden			Rv1113
Other	strand:+	rslayden			Rv1113
Symbol	Vap BC-21	rslayden			MTCY22G8.02 (65 aa), FASTA scores: opt: 97, E(): 2.2, (33.35% identity in 69 aa overlap); etc. Contains PS00402 Binding-protein-dependent transport systems inner membrane comp signature.
Other	start:3070583	rslayden			MTCY22G8.02 (65 aa), FASTA scores: opt: 97, E(): 2.2, (33.35% identity in 69 aa overlap); etc. Contains PS00402 Binding-protein-dependent transport systems inner membrane comp signature.
Other	stop:3070849	rslayden			MTCY22G8.02 (65 aa), FASTA scores: opt: 97, E(): 2.2, (33.35% identity in 69 aa overlap); etc. Contains PS00402 Binding-protein-dependent transport systems inner membrane comp signature.
Other	strand:+	rslayden			MTCY22G8.02 (65 aa), FASTA scores: opt: 97, E(): 2.2, (33.35% identity in 69 aa overlap); etc. Contains PS00402 Binding-protein-dependent transport systems inner membrane comp signature.
Symbol	Vap BC-21	rslayden			Conserved hypothetical protein, similar to several other M. tuberculosis hypothetical proteins e.g. P95008
Other	start:3070583	rslayden			Conserved hypothetical protein, similar to several other M. tuberculosis hypothetical proteins e.g. P95008
Other	stop:3070849	rslayden			Conserved hypothetical protein, similar to several other M. tuberculosis hypothetical proteins e.g. P95008
Other	strand:+	rslayden			Conserved hypothetical protein, similar to several other M. tuberculosis hypothetical proteins e.g. P95008
Symbol	Vap BC-21	rslayden			Rv2545 (92 aa), FASTA scores: opt: 151, E(): 0.00028, (66.65%identity in 45 aa overlap); Q10771
Other	start:3070583	rslayden			Rv2545 (92 aa), FASTA scores: opt: 151, E(): 0.00028, (66.65%identity in 45 aa overlap); Q10771
Other	stop:3070849	rslayden			Rv2545 (92 aa), FASTA scores: opt: 151, E(): 0.00028, (66.65%identity in 45 aa overlap); Q10771
Other	strand:+	rslayden			Rv2545 (92 aa), FASTA scores: opt: 151, E(): 0.00028, (66.65%identity in 45 aa overlap); Q10771
Symbol	Vap BC-21	rslayden			YF60_MYCTU
Other	start:3070583	rslayden			YF60_MYCTU
Other	stop:3070849	rslayden			YF60_MYCTU
Other	strand:+	rslayden			YF60_MYCTU
Symbol	Vap BC-21	rslayden			Rv1560
Other	start:3070583	rslayden			Rv1560
Other	stop:3070849	rslayden			Rv1560
Other	strand:+	rslayden			Rv1560
Symbol	Vap BC-21	rslayden			MT1611
Other	start:3070583	rslayden			MT1611
Other	stop:3070849	rslayden			MT1611
Other	strand:+	rslayden			MT1611
Symbol	Vap BC-21	rslayden			MTCY48.05c (72 aa), FASTA scores: opt: 106, E(): 0.52, (39.15% identity in 46 aa overlap); O06565
Other	start:3070583	rslayden			MTCY48.05c (72 aa), FASTA scores: opt: 106, E(): 0.52, (39.15% identity in 46 aa overlap); O06565

TB Genome Annotation Portal