5ecy

Structural highlights

Function

VAPC_SHIFL Toxic component of a toxin-antitoxin (TA) module. A tRNA-(fMet) endonuclease, it cleaves both charged and uncharged tRNA-(fMet) between positions 38 and 39 at the anticodon stem-loop boundary. Does not cleave tRNA(Met), tRNA(Arg2), tRNA(His), tRNA(Leu), tRNA(Phe) tRNA(Thr1), tRNA(Tyr) or tRNA(Val). Overexpression in E.coli inhibits translation, leads to loss of cell growth and degradation of tRNA(fMet); these effects are neutralized by expression of cognate antitoxin VapB. The VapB/VapC complex probably regulates transcription of its own promoter.^{[1] [2]} Ectopic overexpression in E.coli induces the YoeB toxin, but this is not the cause of VapC toxicity.^{[3] [4]}

See Also

• Endonuclease 3D structures

References

1. ↑ Winther KS, Gerdes K. Ectopic production of VapCs from Enterobacteria inhibits translation and trans-activates YoeB mRNA interferase. Mol Microbiol. 2009 May;72(4):918-30. doi: 10.1111/j.1365-2958.2009.06694.x. Epub, 2009 Apr 14. PMID:19400780 doi:http://dx.doi.org/10.1111/j.1365-2958.2009.06694.x
2. ↑ Winther KS, Gerdes K. Enteric virulence associated protein VapC inhibits translation by cleavage of initiator tRNA. Proc Natl Acad Sci U S A. 2011 May 3;108(18):7403-7. doi:, 10.1073/pnas.1019587108. Epub 2011 Apr 18. PMID:21502523 doi:http://dx.doi.org/10.1073/pnas.1019587108
3. ↑ Winther KS, Gerdes K. Ectopic production of VapCs from Enterobacteria inhibits translation and trans-activates YoeB mRNA interferase. Mol Microbiol. 2009 May;72(4):918-30. doi: 10.1111/j.1365-2958.2009.06694.x. Epub, 2009 Apr 14. PMID:19400780 doi:http://dx.doi.org/10.1111/j.1365-2958.2009.06694.x
4. ↑ Winther KS, Gerdes K. Enteric virulence associated protein VapC inhibits translation by cleavage of initiator tRNA. Proc Natl Acad Sci U S A. 2011 May 3;108(18):7403-7. doi:, 10.1073/pnas.1019587108. Epub 2011 Apr 18. PMID:21502523 doi:http://dx.doi.org/10.1073/pnas.1019587108