1ijc: Difference between revisions
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< | ==Solution Structure of Bucandin, a Neurotoxin from the Venom of the Malayan Krait== | ||
<StructureSection load='1ijc' size='340' side='right'caption='[[1ijc]]' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1ijc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bungarus_candidus Bungarus candidus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IJC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IJC FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=1ijc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ijc OCA], [https://pdbe.org/1ijc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ijc RCSB], [https://www.ebi.ac.uk/pdbsum/1ijc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ijc ProSAT]</span></td></tr> | ||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/3NOJ_BUNCA 3NOJ_BUNCA] This toxin is described as enhancing presynaptic acetylcholine release, but neither experimental results, nor references to other sources are available.<ref>PMID:11053837</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
A high-resolution solution structure of bucandin, a neurotoxin from Malayan krait (Bungarus candidus), was determined by (1)H-NMR spectroscopy and molecular dynamics. The average backbone root-mean-square deviation for the 20 calculated structures and the mean structure is 0.47 A (1 A=0.1 nm) for all residues and 0.24 A for the well-defined region that spans residues 23-58. Secondary-structural elements include two antiparallel beta-sheets characterized by two and four strands. According to recent X-ray analysis, bucandin adopts a typical three-finger loop motif and yet it has some peculiar characteristics that set it apart from other common alpha-neurotoxins. The presence of a fourth strand in the second antiparallel beta-sheet had not been observed before in three-finger toxins, and this feature was well represented in the NMR structure. Although the overall fold of the NMR structure is similar to that of the X-ray crystal structure, there are significant differences between the two structures that have implications for the pharmacological action of the toxin. These include the extent of the beta-sheets, the conformation of the region spanning residues 42-49 and the orientation of some side chains. In comparison with the X-ray structure, the NMR structure shows that the hydrophobic side chains of Trp(27) and Trp(36) are stacked together and are orientated towards the tip of the middle loop. The NMR study also showed that the two-stranded beta-sheet incorporated in the first loop, as defined by residues 1-22, and the C-terminus from Asn(59), is probably flexible relative to the rest of the molecule. On the basis of the dispositions of the hydrophobic and hydrophilic side chains, the structure of bucandin is clearly different from those of cytotoxins. | |||
NMR structure of bucandin, a neurotoxin from the venom of the Malayan krait (Bungarus candidus).,Torres AM, Kini RM, Selvanayagam N, Kuchel PW Biochem J. 2001 Dec 15;360(Pt 3):539-48. PMID:11736642<ref>PMID:11736642</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1ijc" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Bucandin|Bucandin]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | |||
== | |||
[[Category: Bungarus candidus]] | [[Category: Bungarus candidus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Kini | [[Category: Kini RM]] | ||
[[Category: Kuchel | [[Category: Kuchel PW]] | ||
[[Category: Nirthanan | [[Category: Nirthanan S]] | ||
[[Category: Torres | [[Category: Torres AM]] | ||
Latest revision as of 07:36, 17 October 2024
Solution Structure of Bucandin, a Neurotoxin from the Venom of the Malayan KraitSolution Structure of Bucandin, a Neurotoxin from the Venom of the Malayan Krait
Structural highlights
Function3NOJ_BUNCA This toxin is described as enhancing presynaptic acetylcholine release, but neither experimental results, nor references to other sources are available.[1] Publication Abstract from PubMedA high-resolution solution structure of bucandin, a neurotoxin from Malayan krait (Bungarus candidus), was determined by (1)H-NMR spectroscopy and molecular dynamics. The average backbone root-mean-square deviation for the 20 calculated structures and the mean structure is 0.47 A (1 A=0.1 nm) for all residues and 0.24 A for the well-defined region that spans residues 23-58. Secondary-structural elements include two antiparallel beta-sheets characterized by two and four strands. According to recent X-ray analysis, bucandin adopts a typical three-finger loop motif and yet it has some peculiar characteristics that set it apart from other common alpha-neurotoxins. The presence of a fourth strand in the second antiparallel beta-sheet had not been observed before in three-finger toxins, and this feature was well represented in the NMR structure. Although the overall fold of the NMR structure is similar to that of the X-ray crystal structure, there are significant differences between the two structures that have implications for the pharmacological action of the toxin. These include the extent of the beta-sheets, the conformation of the region spanning residues 42-49 and the orientation of some side chains. In comparison with the X-ray structure, the NMR structure shows that the hydrophobic side chains of Trp(27) and Trp(36) are stacked together and are orientated towards the tip of the middle loop. The NMR study also showed that the two-stranded beta-sheet incorporated in the first loop, as defined by residues 1-22, and the C-terminus from Asn(59), is probably flexible relative to the rest of the molecule. On the basis of the dispositions of the hydrophobic and hydrophilic side chains, the structure of bucandin is clearly different from those of cytotoxins. NMR structure of bucandin, a neurotoxin from the venom of the Malayan krait (Bungarus candidus).,Torres AM, Kini RM, Selvanayagam N, Kuchel PW Biochem J. 2001 Dec 15;360(Pt 3):539-48. PMID:11736642[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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