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dc.contributor.authorTorres, Allan M.
dc.contributor.authorKini, R. Manjunatha
dc.contributor.authorNirthanan, Niru
dc.contributor.authorKuchel, Philip W.
dc.date.accessioned2009-07-09
dc.date.accessioned2014-05-26T00:57:36Z
dc.date.accessioned2017-03-02T01:13:09Z
dc.date.available2017-03-02T01:13:09Z
dc.date.issued2001
dc.date.modified2014-05-26T00:57:36Z
dc.identifier.issn1470-8728
dc.identifier.doi10.1042/bj3600539
dc.identifier.urihttp://hdl.handle.net/10072/59285
dc.description.abstractA 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.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.publisherPortland Press
dc.publisher.placeLondon, UK
dc.relation.ispartofpagefrom539
dc.relation.ispartofpageto548
dc.relation.ispartofissue3
dc.relation.ispartofjournalBiochemical Journal
dc.relation.ispartofvolume360
dc.subject.fieldofresearchStructural Biology (incl. Macromolecular Modelling)
dc.subject.fieldofresearchChemical Sciences
dc.subject.fieldofresearchBiological Sciences
dc.subject.fieldofresearchMedical and Health Sciences
dc.subject.fieldofresearchcode060112
dc.subject.fieldofresearchcode03
dc.subject.fieldofresearchcode06
dc.subject.fieldofresearchcode11
dc.titleNMR structure of bucandin, a neurotoxin from the venom of the Malayan krait (Bungarus candidus).
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codec1x
gro.facultyGriffith Health Faculty
gro.hasfulltextNo Full Text
gro.griffith.authorNirthanan, Niru


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