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N-TERMINAL CONSTANT REGION OF THE NUCLEAR ENVELOPE PROTEIN LAP2N-TERMINAL CONSTANT REGION OF THE NUCLEAR ENVELOPE PROTEIN LAP2
Structural highlights
DiseaseLAP2A_HUMAN Defects in TMPO are the cause of cardiomyopathy dilated type 1T (CMD1T) [MIM:613740. A disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death.[1] FunctionLAP2A_HUMAN May be involved in the structural organization of the nucleus and in the post-mitotic nuclear assembly. Plays an important role, together with LMNA, in the nuclear anchorage of RB1. TP and TP5 may play a role in T-cell development and function. TP5 is an immunomodulating pentapeptide. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe nuclear envelope proteins LAP2, emerin and MAN1 share a conserved approximately 40-residue 'LEM' motif. Loss of emerin causes Emery-Dreifuss muscular dystrophy. We have solved the solution NMR structure of the constant region of human LAP2 (residues 1-168). Human LAP2(1-168) has two structurally independent, non-interacting domains located at residues 1-50 ('LAP2-N') and residues 111-152 (LEM-domain), connected by an approximately 60-residue flexible linker. The two domains are structurally homologous, comprising a helical turn followed by two helices connected by an 11-12-residue loop. This motif is shared by subdomains of T4 endonuclease VII and transcription factor rho, despite negligible (< or =15%) sequence identity. NMR chemical shift mapping demonstrated that the LEM-domain binds BAF (barrier-to-autointegration factor), whereas LAP2-N binds DNA. Both binding surfaces comprise helix 1, the N-terminus of helix 2 and the inter-helical loop. Binding selectivity is determined by the nature of the surface residues in these binding sites, which are predominantly positively charged for LAP2-N and hydrophobic for the LEM-domain. Thus, LEM and LEM-like motifs form a common structure that evolution has customized for binding to BAF or DNA. Solution structure of the constant region of nuclear envelope protein LAP2 reveals two LEM-domain structures: one binds BAF and the other binds DNA.,Cai M, Huang Y, Ghirlando R, Wilson KL, Craigie R, Clore GM EMBO J. 2001 Aug 15;20(16):4399-407. PMID:11500367[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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