2rq2

The solution structure of the N-terminal fragment of big defensin

spinqualitylabelsall models 2rq2 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2rq2 is a 1 chain structure with sequence from Tachypleus tridentatus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BDEF_TACTR Significantly inhibits the growth of Gram-negative and Gram-positive bacteria and fungi in vitro. Publication Abstract from PubMed Big defensin is a 79-residue peptide derived from hemocytes of the Japanese horseshoe crab. The amino acid sequence of big defensin is divided into an N-terminal hydrophobic domain and a C-terminal cationic domain, which are responsible for antimicrobial activities against Gram-positive and -negative bacteria, respectively. The N-terminal domain of big defensin forms a unique globular conformation with two alpha-helices and a parallel beta-sheet, while the C-terminal domain adopts a beta-defensin-like fold. Although our previous study implied that big defensin changes its N-terminal structure in a micellar environment, due to the poor quality of the NMR spectra it remained to be resolved whether the N-terminal domain adopts any structure in the presence of micelles. In this analysis, we successfully determined the structure of the N-terminal fragment of big defensin in a micellar solution, showing that the fragment peptide forms a single alpha-helix structure. Moreover, NMR experiments using paramagnetic probes revealed that the N-terminal domain of big defensin penetrates into the micelle with a dipping at the N-terminal edge of the alpha-helix. Here, we propose a model for how big defensin associates with the target membrane. A novel beta-defensin structure: big defensin changes its N-terminal structure to associate with the target membrane.,Kouno T, Mizuguchi M, Aizawa T, Shinoda H, Demura M, Kawabata S, Kawano K Biochemistry. 2009 Aug 18;48(32):7629-35. PMID:19588912 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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