1H9F image
Entry Detail
PDB ID:
1H9F
Title:
LEM DOMAIN OF HUMAN INNER NUCLEAR MEMBRANE PROTEIN LAP2
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2001-03-09
Release Date:
2001-06-17
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
10
Selection Criteria:
LOWER ENERGY
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Lamina-associated polypeptide 2, isoform alpha
Chain IDs:A
Chain Length:57
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural Characterization of the Lem Motif Common to Three Human Inner Nuclear Membrane Proteins
Structure 9 503 ? (2001)
PMID: 11435115 DOI: 10.1016/S0969-2126(01)00611-6

Abstact

BACKGROUND: Integral membrane proteins of the inner nuclear membrane are involved in chromatin organization and postmitotic reassembly of the nucleus. The discovery that mutations in the gene encoding emerin causes X-linked Emery-Dreifuss muscular dystrophy has enhanced interest in such proteins. A common structural domain of 50 residues, called the LEM domain, has been identified in emerin MAN1, and lamina-associated polypeptide (LAP) 2. In particular, all LAP2 isoforms share an N-terminal segment composed of such a LEM domain that is connected to a highly divergent LEM-like domain by a linker that is probably unstructured. RESULTS: We have determined the three-dimensional structures of the LEM and LEM-like domains of LAP2 using nuclear magnetic resonance and molecular modeling. Both domains adopt the same fold, mainly composed of two large parallel alpha helices. CONCLUSIONS: The structural LEM motif is found in human inner nuclear membrane proteins and in protein-protein interaction domains from bacterial multienzyme complexes. This suggests that LEM and LEM-like domains are protein-protein interaction domains. A region conserved in all LEM domains, at the surface of helix 2, could mediate interaction between LEM domains and a common protein partner.

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