2mq4

<StructureSection load='2mq4' size='340' side='right'caption='[[2mq4]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>

<table><tr><td colspan='2'>[[2mq4]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MQ4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2MQ4 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2mq2|2mq2]], [[2mq5|2mq5]]</div></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=2mq4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2mq4 OCA], [https://pdbe.org/2mq4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2mq4 RCSB], [https://www.ebi.ac.uk/pdbsum/2mq4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2mq4 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

BACKGROUND: Protegin-1 (PG-1: RGGRLCYCRRRFCVCVGR-amide) assumes a rigid beta-hairpin like structure that is stabilized by two disulfide bridges between Cys6-Cys15 and Cys8-Cys13. Previous studies, employing linear analogs of PG-1, with Cys to Ala mutations or modified Cys, have demonstrated that the disulfide bridges are critical for the broad spectrum and salt resistant antimicrobial activity of PG-1. METHODS: In order to understand structural and functional roles of disulfide bonds in protegrins, we have synthesized a Cys deleted variant of PG-1 or CDP-1, RGGRLYRRRFVVGR-amide, and two of its analogs, RR11, RLYRRRFVVGR-amide, and LR10, LYRRRFVVGR-amide, containing deletion of residues at the N-terminus. These peptides have been characterized for bactericidal activity and mode of action in lipopolysaccharide (LPS) using optical spectroscopy, ITC and NMR. RESULTS: Antibacterial activity, against Gram-negative and Gram-positive strains, of the three peptides follows the order: CDP-1&gt;RR11&gt;LR10. LR10 displays only limited activity toward Gram-negative strains. CDP-1 demonstrates efficient membrane permeabilization and high-affinity interactions with LPS. CDP-1 and RR11 both assume beta-hairpin like compact structures in complex with LPS, whereas LR10 adopts an extended conformation in LPS. In zwitterionic DPC micelles CDP-1 and the truncated analog peptides do not adopt folded conformations. MAJOR CONCLUSIONS: Despite the absence of stabilizing disulfide bridges CDP-1 shows broad-spectrum antibacterial activity and assumes beta-hairpin like structure in complex with LPS. The beta-hairpin structure may be essential for outer membrane permeabilization and cell killing.

Cysteine deleted protegrin-1 (CDP-1): Anti-bacterial activity, outer-membrane disruption and selectivity.,Mohanram H, Bhattacharjya S Biochim Biophys Acta. 2014 Jul 2. pii: S0304-4165(14)00238-4. doi:, 10.1016/j.bbagen.2014.06.018. PMID:24997421<ref>PMID:24997421</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 2mq4" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Bhattacharjya, S]]

[[Category: Mohanram, H]]

[[Category: Beta hairpin]]