2hcb
From Proteopedia
Structure of AMPPCP-bound DnaA from Aquifex aeolicus
Structural highlights
FunctionDNAA_AQUAE Plays an important role in the initiation and regulation of chromosomal replication. Binds to the origin of replication; it binds specifically double-stranded DNA at a 9 bp consensus (dnaA box): 5'-TTATC[CA]A[CA]A-3'. DnaA binds to ATP and to acidic phospholipids (By similarity). 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 PubMedIn bacteria, the initiation of replication is controlled by DnaA, a member of the ATPases associated with various cellular activities (AAA+) protein superfamily. ATP binding allows DnaA to transition from a monomeric state into a large oligomeric complex that remodels replication origins, triggers duplex melting and facilitates replisome assembly. The crystal structure of AMP-PCP-bound DnaA reveals a right-handed superhelix defined by specific protein-ATP interactions. The observed quaternary structure of DnaA, along with topology footprint assays, indicates that a right-handed DNA wrap is formed around the initiation nucleoprotein complex. This model clarifies how DnaA engages and unwinds bacterial origins and suggests that additional, regulatory AAA+ proteins engage DnaA at filament ends. Eukaryotic and archaeal initiators also have the structural elements that promote open-helix formation, indicating that a spiral, open-ring AAA+ assembly forms the core element of initiators in all domains of life. Structural basis for ATP-dependent DnaA assembly and replication-origin remodeling.,Erzberger JP, Mott ML, Berger JM Nat Struct Mol Biol. 2006 Aug;13(8):676-83. Epub 2006 Jul 9. PMID:16829961[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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