View source for 6qkq


==NMR solution structure of LSR2-T112D binding domain.==
<StructureSection load='6qkq' size='340' side='right'caption='[[6qkq]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6qkq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6QKQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6QKQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6qkq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6qkq OCA], [https://pdbe.org/6qkq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6qkq RCSB], [https://www.ebi.ac.uk/pdbsum/6qkq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6qkq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LSR2_MYCTU LSR2_MYCTU] DNA-bridging protein that has both architectural and regulatory roles. Influences the organization of chromatin and gene expression by binding non-specifically to DNA, with a preference for AT-rich sequences, and bridging distant DNA segments. Represses expression of multiple genes involved in a broad range of cellular processes, including major virulence factors or antibiotic-induced genes, such as iniBAC or efpA. May coordinate global gene regulation and virulence. Also protects mycobacteria against reactive oxygen intermediates during macrophage infection by acting as a physical barrier to DNA degradation.<ref>PMID:17590082</ref> <ref>PMID:18187505</ref> <ref>PMID:19237572</ref> <ref>PMID:20133735</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mycobacterium tuberculosis (Mtb) is able to persist in the body through months of multi-drug therapy. Mycobacteria possess a wide range of regulatory proteins, including the protein kinase B (PknB) which controls peptidoglycan biosynthesis during growth. Here, we observed that depletion of PknB resulted in specific transcriptional changes, that are likely caused by reduced phosphorylation of the H-NS-like regulator Lsr2 at threonine 112. The activity of PknB towards this phosphosite was confirmed with purified proteins, and this site was required for adaptation of Mtb to hypoxic conditions, and growth on solid media. Like H-NS, Lsr2 binds DNA in sequence-dependent and non-specific modes. PknB phosphorylation of Lsr2 reduced DNA binding, measured by fluorescence anisotropy and electrophoretic mobility shift assays, and our NMR structure of phosphomimetic T112D Lsr2 suggests that this may be due to increased dynamics of the DNA binding domain. Conversely, the phosphoablative T112A Lsr2 had increased binding to certain DNA sites in ChIP-sequencing, and Mtb containing this variant showed transcriptional changes that correspond with the change in DNA binding. In summary, PknB controls Mtb growth and adaptations to the changing host environment by phosphorylating the global transcriptional regulator Lsr2.

Protein kinase B controls Mycobacterium tuberculosis growth via phosphorylation of the transcriptional regulator Lsr2 at threonine 112.,Alqaseer K, Turapov O, Barthe P, Jagatia H, De Visch A, Roumestand C, Wegrzyn M, Bartek IL, Voskuil MI, O'Hare HM, Ajuh P, Bottrill AR, Witney AA, Cohen-Gonsaud M, Waddell SJ, Mukamolova GV Mol Microbiol. 2019 Sep 28. doi: 10.1111/mmi.14398. PMID:31562654<ref>PMID:31562654</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6qkq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis H37Rv]]
[[Category: Barthe P]]
[[Category: Cohen-Gonsaud M]]
[[Category: Mukamolova GV]]