1lfc
From Proteopedia
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| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1lfc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lfc OCA], [http://www.ebi.ac.uk/pdbsum/1lfc PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1lfc RCSB]</span> | ||
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Revision as of 19:02, 30 March 2008
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
BOVINE LACTOFERRICIN (LFCINB), NMR, 20 STRUCTURES
Overview
The solution structure of bovine lactoferricin (LfcinB) has been determined using 2D 1H NMR spectroscopy. LfcinB is a 25-residue antimicrobial peptide released by pepsin cleavage of lactoferrin, an 80 kDa iron-binding glycoprotein with many immunologically important functions. The NMR structure of LfcinB reveals a somewhat distorted antiparallel beta-sheet. This contrasts with the X-ray structure of bovine lactoferrin, in which residues 1-13 (of LfcinB) form an alpha-helix. Hence, this region of lactoferricin B appears able to adopt a helical or sheetlike conformation, similar to what has been proposed for the amyloidogenic prion proteins and Alzheimer's beta-peptides. LfcinB has an extended hydrophobic surface comprised of residues Phe1, Cys3, Trp6, Trp8, Pro16, Ile18, and Cys20. The side chains of these residues are well-defined in the NMR structure. Many hydrophilic and positively charged residues surround the hydrophobic surface, giving LfcinB an amphipathic character. LfcinB bears numerous similarities to a vast number of cationic peptides which exert their antimicrobial activities through membrane disruption. The structures of many of these peptides have been well characterized, and models of their membrane-permeabilizing mechanisms have been proposed. The NMR solution structure of LfcinB may be more relevant to membrane interaction than that suggested by the X-ray structure of intact lactoferrin. Based on the solution structure, it is now possible to propose potential mechanisms for the antimicrobial action of LfcinB.
About this Structure
1LFC is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.
Reference
Three-dimensional solution structure of lactoferricin B, an antimicrobial peptide derived from bovine lactoferrin., Hwang PM, Zhou N, Shan X, Arrowsmith CH, Vogel HJ, Biochemistry. 1998 Mar 24;37(12):4288-98. PMID:9521752
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