6e0c

Cryo-EM structure of the CENP-A nucleosome (W601) in complex with a single chain antibody fragmentCryo-EM structure of the CENP-A nucleosome (W601) in complex with a single chain antibody fragment

6e0c, resolution 2.63Å Show:Asymmetric Unit Biological Assembly Structural highlights 6e0c is a 12 chain structure with sequence from Escherichia coli, Homo sapiens and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.63Å Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CENPA_HUMAN Histone H3-like variant which exclusively replaces conventional H3 in the nucleosome core of centromeric chromatin at the inner plate of the kinetochore. Required for recruitment and assembly of kinetochore proteins, mitotic progression and chromosome segregation. May serve as an epigenetic mark that propagates centromere identity through replication and cell division. The CENPA-H4 heterotetramer can bind DNA by itself (in vitro). Publication Abstract from PubMed Genomic DNA in eukaryotes is organized into chromatin through association with core histones to form nucleosomes, each distinguished by their DNA sequences and histone variants. Here, we used a single-chain antibody fragment (scFv) derived from the anti-nucleosome antibody mAb PL2-6 to stabilize human CENP-A nucleosome containing a native alpha-satellite DNA and solved its structure by the cryo-electron microscopy (cryo-EM) to 2.6 A resolution. In comparison, the corresponding cryo-EM structure of the free CENP-A nucleosome could only reach 3.4 A resolution. We find that scFv binds to a conserved acidic patch on the histone H2A-H2B dimer without perturbing the nucleosome structure. Our results provide an atomic resolution cryo-EM structure of a nucleosome and insight into the structure and function of the CENP-A nucleosome. The scFv approach is applicable to the structural determination of other native-like nucleosomes with distinct DNA sequences. Atomic resolution cryo-EM structure of a native-like CENP-A nucleosome aided by an antibody fragment.,Zhou BR, Yadav KNS, Borgnia M, Hong J, Cao B, Olins AL, Olins DE, Bai Y, Zhang P Nat Commun. 2019 May 24;10(1):2301. doi: 10.1038/s41467-019-10247-4. PMID:31127102 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Antibody 3D structures Monoclonal Antibodies 3D structures