1LFC image
Entry Detail
PDB ID:
1LFC
Title:
BOVINE LACTOFERRICIN (LFCINB), NMR, 20 STRUCTURES
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
1998-06-24
Release Date:
1998-11-04
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
20
Selection Criteria:
LEAST RESTRAINT VIOLATION
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:LACTOFERRICIN
Chain IDs:A
Chain Length:25
Number of Molecules:1
Biological Source:Bos taurus
Ligand Molecules
Primary Citation
Three-dimensional solution structure of lactoferricin B, an antimicrobial peptide derived from bovine lactoferrin.
Biochemistry 37 4288 4298 (1998)
PMID: 9521752 DOI: 10.1021/bi972323m

Abstact

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.

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Primary Citation of related structures