This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.


4e1p

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Current revision (11:01, 1 March 2024) (edit) (undo)
 
Line 4: Line 4:
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4e1p]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4E1P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4E1P FirstGlance]. <br>
<table><tr><td colspan='2'>[[4e1p]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4E1P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4E1P FirstGlance]. <br>
-
</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=4e1p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4e1p OCA], [https://pdbe.org/4e1p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4e1p RCSB], [https://www.ebi.ac.uk/pdbsum/4e1p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4e1p ProSAT]</span></td></tr>
+
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.728&#8491;</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=4e1p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4e1p OCA], [https://pdbe.org/4e1p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4e1p RCSB], [https://www.ebi.ac.uk/pdbsum/4e1p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4e1p ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== 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>
+
[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 ==
+
-
Lsr2 is a small DNA-binding protein present in mycobacteria and related actinobacteria that regulates gene expression and influences the organization of bacterial chromatin. Lsr2 is a dimer that binds to AT-rich regions of chromosomal DNA and physically protects DNA from damage by reactive oxygen intermediates (ROI). A recent structure of the C-terminal DNA-binding domain of Lsr2 provides a rationale for its interaction with the minor groove of DNA, its preference for AT-rich tracts, and its similarity to other bacterial nucleoid-associated DNA-binding domains. In contrast, the details of Lsr2 dimerization (and oligomerization) via its N-terminal domain, and the mechanism of Lsr2-mediated chromosomal cross-linking and protection is unknown. We have solved the structure of the N-terminal domain of Lsr2 (N-Lsr2) at 1.73 A resolution using crystallographic ab initio approaches. The structure shows an intimate dimer of two ss-ss-a motifs with no close homologues in the structural databases. The organization of individual N-Lsr2 dimers in the crystal also reveals a mechanism for oligomerization. Proteolytic removal of three N-terminal residues from Lsr2 results in the formation of an anti-parallel beta-sheet between neighboring molecules and the formation of linear chains of N-Lsr2. Oligomerization can be artificially induced using low concentrations of trypsin and the arrangement of N-Lsr2 into long chains is observed in both monoclinic and hexagonal crystallographic space groups. In solution, oligomerization of N-Lsr2 is also observed following treatment with trypsin. A change in chromosomal topology after the addition of trypsin to full-length Lsr2-DNA complexes and protection of DNA towards DNAse digestion can be observed using electron microscopy and electrophoresis. These results suggest a mechanism for oligomerization of Lsr2 via protease-activation leading to chromosome compaction and protection, and concomitant down-regulation of large numbers of genes. This mechanism is likely to be relevant under conditions of stress where cellular proteases are known to be upregulated.
+
-
 
+
-
The structure of the oligomerization domain of Lsr2 from Mycobacterium tuberculosis reveals a mechanism for chromosome organization and protection.,Summers EL, Meindl K, Uson I, Mitra AK, Radjainia M, Colangeli R, Alland D, Arcus VL PLoS One. 2012;7(6):e38542. doi: 10.1371/journal.pone.0038542. Epub 2012 Jun 13. PMID:22719899<ref>PMID:22719899</ref>
+
-
 
+
-
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+
-
</div>
+
-
<div class="pdbe-citations 4e1p" style="background-color:#fffaf0;"></div>
+
== References ==
== References ==
<references/>
<references/>

Current revision

Crystal structure of the dimerization domain of Lsr2 from Mycobacterium tuberculosis in the P 1 21 1 space group

PDB ID 4e1p

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4e1p"
Personal tools