6fgk

Structural highlights

Function

[YWAC_BACSU] Functions as a (p)ppGpp synthase; GDP can be used instead of GTP, resulting in an increase of (p)ppGpp synthesis (PubMed:18067544). Overexpression in relA mutants (triple relA-yjbM-ywaC deletions and single relA deletions) leads to growth arrest; GTP levels fall drastically, various guanine-related nucleotides are synthesized (ppGp or pGpp), the cellular transcriptional profile changes dramatically and 70S ribosome dimerization occurs (PubMed:22950019). Overexpression in the presence of a wild-type relA gene does not have these effects (PubMed:22950019). 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. activities in response to changes in nutritional abundance. YwaC has probably a minor role in stringent response (PubMed:18067544).^{[1] [2]}

References

1. ↑ Nanamiya H, Kasai K, Nozawa A, Yun CS, Narisawa T, Murakami K, Natori Y, Kawamura F, Tozawa Y. Identification and functional analysis of novel (p)ppGpp synthetase genes in Bacillus subtilis. Mol Microbiol. 2008 Jan;67(2):291-304. Epub 2007 Dec 7. PMID:18067544 doi:http://dx.doi.org/10.1111/j.1365-2958.2007.06018.x
2. ↑ Tagami K, Nanamiya H, Kazo Y, Maehashi M, Suzuki S, Namba E, Hoshiya M, Hanai R, Tozawa Y, Morimoto T, Ogasawara N, Kageyama Y, Ara K, Ozaki K, Yoshida M, Kuroiwa H, Kuroiwa T, Ohashi Y, Kawamura F. Expression of a small (p)ppGpp synthetase, YwaC, in the (p)ppGpp(0) mutant of Bacillus subtilis triggers YvyD-dependent dimerization of ribosome. Microbiologyopen. 2012 Jun;1(2):115-34. doi: 10.1002/mbo3.16. PMID:22950019 doi:http://dx.doi.org/10.1002/mbo3.16