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The structure of nucleosome assembly protein suggests a mechanism for histone binding and shuttling
Structural highlights
FunctionNAP1_YEAST Acidic protein, which assembles histones into an octamer (in vitro). Involved in the regulation of the localization and the function of the septins during mitosis. Involved in the function of B-type cyclins.[1] [2] [3] [4] 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 PubMedNucleosome assembly protein 1 (NAP-1) is an integral component in the establishment, maintenance, and dynamics of eukaryotic chromatin. It shuttles histones into the nucleus, assembles nucleosomes, and promotes chromatin fluidity, thereby affecting the transcription of many genes. The 3.0 A crystal structure of yeast NAP-1 reveals a previously uncharacterized fold with implications for histone binding and shuttling. A long alpha-helix is responsible for homodimerization via a previously uncharacterized antiparallel non-coiled-coil, and an alpha/beta domain is implicated in protein-protein interaction. A nuclear export sequence that is embedded in the dimerization helix is almost completely masked by an accessory domain that contains several target sites for casein kinase II. The four-stranded antiparallel beta-sheet that characterizes the alpha/beta domain is found in all histone chaperones, despite the absence of homology in sequence, structural context, or quaternary structure. To our knowledge, this is the first structure of a member of the large NAP family of proteins and suggests a mechanism by which the shuttling of histones to and from the nucleus is regulated. The structure of nucleosome assembly protein 1.,Park YJ, Luger K Proc Natl Acad Sci U S A. 2006 Jan 31;103(5):1248-53. Epub 2006 Jan 23. PMID:16432217[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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