4drb
The crystal structure of FANCM bound MHF complex
Structural highlights
FunctionCENPS_HUMAN DNA-binding component of the FA core complex involved in DNA damage repair and genome maintenance. Required for optimal chromatin association of the FA core complex. Required for efficient damage-induced monoubiquitination and focus formation of FANCD2. Stabilizes FAAD24, FANCM and STRA13/CENPX in the FA core complex. Plays a role in DNA interstrand cross-linking (ICL) repair and in recovery of replication forks stalled by topoisomerase I-DNA cleavage intermediates induced by camptothecin. Component of the heterotetrameric CENP-T-W-S-X complex that binds and supercoils DNA, and plays an important role in kinetochore assembly. Component of the APITD1/CENPS complex that is essential for the stable assembly of the outer kinetochore. Plays an important role in mitotic progression and chromosome segregation. Component of the CENPA-CAD (nucleosome distal) complex, a complex recruited to centromeres which is involved in assembly of kinetochore proteins, mitotic progression and chromosome segregation.[1] [2] [REFERENCE:8] Publication Abstract from PubMedFanconi anaemia is a rare genetic disease characterized by chromosomal instability and cancer susceptibility. The Fanconi anaemia complementation group protein M (FANCM) forms an evolutionarily conserved DNA-processing complex with MHF1/MHF2 (histone-fold-containing proteins), which is essential for DNA repair in response to genotoxic stress. Here we present the crystal structures of the MHF1-MHF2 complex alone and bound to a fragment of FANCM (FANCM(661-800), designated FANCM-F). The structures show that MHF1 and MHF2 form a compact tetramer to which FANCM-F binds through a 'dual-V' shaped structure. FANCM-F and (MHF1-MHF2)(2) cooperate to constitute a new DNA-binding site that is coupled to the canonical L1L2 region. Perturbation of the MHF-FANCM-F structural plasticity changes the localization of FANCM in vivo. The MHF-FANCM interaction and its subcellular localization are altered by a disease-associated mutant of FANCM. These findings reveal the molecular basis of MHF-FANCM recognition and provide mechanistic insights into the pathway leading to Fanconi anaemia. The structure of the FANCM-MHF complex reveals physical features for functional assembly.,Tao Y, Jin C, Li X, Qi S, Chu L, Niu L, Yao X, Teng M Nat Commun. 2012 Apr 17;3:782. doi: 10.1038/ncomms1779. PMID:22510687[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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