2L1Q

Solution structure of human Liver Expressed Antimicrobial Peptide 2


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and functional analysis of human liver-expressed antimicrobial peptide 2.

Henriques, S.T.Tan, C.C.Craik, D.J.Clark, R.J.

(2010) Chembiochem 11: 2148-2157

  • DOI: 10.1002/cbic.201000400
  • Primary Citation of Related Structures:  
    2L1Q

  • PubMed Abstract: 
  • Human liver-expressed antimicrobial peptide 2 (LEAP-2) is a cationic antimicrobial peptide (CAMP) believed to have a protective role against bacterial infection. Little is known about the structure-activity relationships of LEAP-2 or its mechanism of action ...

    Human liver-expressed antimicrobial peptide 2 (LEAP-2) is a cationic antimicrobial peptide (CAMP) believed to have a protective role against bacterial infection. Little is known about the structure-activity relationships of LEAP-2 or its mechanism of action. In this study we describe the structure of LEAP-2, analyze its interaction with model membranes, and relate them to the antimicrobial activity of the peptide. The structure of LEAP-2, determined by NMR spectroscopy, reveals a compact central core with disorder at the N and C termini. The core comprises a β-hairpin and a 3(10)- helix that are braced by disulfide bonds between Cys17-28 and Cys23-33 and further stabilized by a network of hydrogen bonds. Membrane-affinity studies show that LEAP-2 membrane binding is governed by electrostatic attractions, which are sensitive to ionic strength. Truncation studies show that the C-terminal region of LEAP-2 is irrelevant for membrane binding, whereas the N-terminal (hydrophobic domain) and core regions (cationic domain) are essential. Bacterial-growth-inhibition assays reveal that the antimicrobial activity of LEAP-2 correlates with membrane affinity. Interestingly, the native and reduced forms of LEAP-2 have similar membrane affinity and antimicrobial activities; this suggests that disulfide bonds are not essential for the bactericidal activity. This study reveals that LEAP-2 has a novel fold for a CAMP and suggests that although LEAP-2 exhibits antimicrobial activity under low-salt conditions, there is likely to be another physiological role for the peptide.


    Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072 Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Liver-expressed antimicrobial peptide 2A40Homo sapiensMutation(s): 0 
Gene Names: LEAP2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q969E1 (Homo sapiens)
Explore Q969E1 
Go to UniProtKB:  Q969E1
PHAROS:  Q969E1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ969E1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2L1Q Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2010-08-03 
  • Released Date: 2010-09-22 
  • Deposition Author(s): Clark, R.J.

Revision History  (Full details and data files)

  • Version 1.0: 2010-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-01-01
    Changes: Data collection, Database references