View source for 2lt1


==Solution NMR structure of the 72-residue N-terminal domain of Myxococcus xanthus CarD==
<StructureSection load='2lt1' size='340' side='right'caption='[[2lt1]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2lt1]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Myxococcus_xanthus Myxococcus xanthus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LT1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2LT1 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=2lt1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2lt1 OCA], [https://pdbe.org/2lt1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2lt1 RCSB], [https://www.ebi.ac.uk/pdbsum/2lt1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2lt1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q50887_MYXXA Q50887_MYXXA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Two prototypes of the large CarD_CdnL_TRCF family of bacterial RNA polymerase (RNAP)-binding proteins, Myxococcus xanthus CarD and CdnL, have distinct functions whose molecular basis remain elusive. CarD, a global regulator linked to the action of several extracytoplasmic function (ECF) sigma-factors, binds to the RNAP beta subunit (RNAP-beta) and to protein CarG via an N-terminal domain, CarDNt, and to DNA via an intrinsically unfolded C-terminal domain resembling eukaryotic high-mobility-group A (HMGA) proteins. CdnL, a CarDNt-like protein that is essential for cell viability, is implicated in sigmaA-dependent rRNA promoter activation and interacts with RNAP-beta but not with CarG. While the HMGA-like domain of CarD by itself is inactive, we find that CarDNt has low but observable ability to activate ECF sigma-dependent promoters in vivo, indicating that the C-terminal DNA-binding domain is required to maximize activity. Our structure-function dissection of CarDNt reveals an N-terminal, five-stranded beta -sheet Tudor-like domain, CarD1-72, whose structure and contacts with RNAP-beta mimic those of CdnL. Intriguingly, and in marked contrast to CdnL, CarD mutations that disrupt its interaction with RNAP-beta did not annul activity. Our data suggest that the CarDNt C-terminal segment, CarD61-179, may be structurally distinct from its CdnL counterpart, and that it houses at least two distinct and crucial function determinants: (a) CarG-binding, which is specific to CarD; and (b) a basic residue stretch, which is also conserved and functionally required in CdnL. This study highlights the evolution of shared and divergent interactions in similar protein modules that enable the distinct activities of two related members of a functionally important and widespread bacterial protein family.

Structure-Function Dissection of Myxococcus xanthus CarD N-Terminal Domain, a Defining Member of the CarD_CdnL_TRCF Family of RNA Polymerase Interacting Proteins.,Bernal-Bernal D, Gallego-Garcia A, Garcia-Martinez G, Garcia-Heras F, Jimenez MA, Padmanabhan S, Elias-Arnanz M PLoS One. 2015 Mar 26;10(3):e0121322. doi: 10.1371/journal.pone.0121322., eCollection 2015. PMID:25811865<ref>PMID:25811865</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2lt1" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Myxococcus xanthus]]
[[Category: Jimenez MA]]
[[Category: Padmanabhan S]]