View source for 1mst


==CRYSTAL STRUCTURE OF MS2 CAPSIDS WITH MUTATIONS IN THE SUBUNIT FG LOOP==
<StructureSection load='1mst' size='340' side='right'caption='[[1mst]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1mst]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_phage_MS2 Escherichia phage MS2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MST OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MST FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6&#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=1mst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mst OCA], [https://pdbe.org/1mst PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mst RCSB], [https://www.ebi.ac.uk/pdbsum/1mst PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mst ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/CAPSD_BPMS2 CAPSD_BPMS2] Self-assembles to form the T=3 icosahedral virus shell that protects the viral nucleic acid. Acts as a translational repressor by binding with high specificity to a single stem-loop structure in the genomic RNA that contains the initiation codon of the gene for the viral replicase. Involved in virus assembly through the interaction between a capsid protein dimer and the multiple packaging signals present in the RNA genome.<ref>PMID:16531233</ref> <ref>PMID:18662904</ref> <ref>PMID:26608810</ref> <ref>PMID:8254664</ref> <ref>PMID:9245600</ref> <ref>PMID:9469847</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ms/1mst_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mst ConSurf].
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== Publication Abstract from PubMed ==
The loop between the F and G beta strands (FG loop) of the bacteriophage MS2 coat protein subunit forms inter-subunit contacts around the 5-fold and 3-fold (quasi 6-fold) axes of the T=3 protein shell. In capsids, the loop is found in two very different conformations, one in B subunits, which form the 5-fold contact, and one in A and C subunits, which form the quasi 6-fold contact. One proline residue, Pro78, is strictly conserved in the coat protein of all related bacteriophages, and in the case of MS2 this proline residue is preceded by a cis peptide bond in the B subunit. In order to probe the role of the FG loop in capsid assembly, we have determined the crystal structures of two MS2 capsids, formed by coat proteins with mutations at two positions in the FG loop, P78N or E76D. These mutants show conformational changes in the FG loops that explain the reduced temperature stability of the capsids. The P78N mutant has a normal trans peptide bond at position 78.

Crystal structures of MS2 capsids with mutations in the subunit FG loop.,Stonehouse NJ, Valegard K, Golmohammadi R, van den Worm S, Walton C, Stockley PG, Liljas L J Mol Biol. 1996 Feb 23;256(2):330-9. PMID:8594200<ref>PMID:8594200</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Escherichia phage MS2]]
[[Category: Large Structures]]
[[Category: Liljas L]]
[[Category: Stonehouse NJ]]