1W5T

Structure of the Aeropyrum Pernix ORC2 protein (ADPNP-ADP complexes)

Summary for 1W5T

• Entry DOI: 10.2210/pdb1w5t/pdb
• Related: 1W5S
• Descriptor: ORC2, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, MAGNESIUM ION, ... (5 entities in total)
• Functional Keywords: orc, cdc6, dna replication initiation, dna binding protein, aaa+ atpase
• Biological source: AEROPYRUM PERNIX
• Total number of polymer chains: 3
• Total formula weight: 140398.70

Authors

Singleton, M.R.,Morales, R.,Grainge, I.,Cook, N.,Isupov, M.N.,Wigley, D.B. (deposition date: 2004-08-09, release date: 2004-10-05, Last modification date: 2024-05-08)

Primary citation

Singleton, M.R.,Morales, R.,Grainge, I.,Cook, N.,Isupov, M.N.,Wigley, D.B.
Conformational Changes Induced by Nucleotide Binding in Cdc6/Orc from Aeropyrum Pernix
J.Mol.Biol., 343:547-, 2004

PubMed Abstract: Archaea contain one or more proteins with homology to eukaryotic ORC/Cdc6 proteins. Sequence analysis suggests the existence of at least two subfamilies of these proteins, for which we propose the nomenclature ORC1 and ORC2. We have determined crystal structures of the ORC2 protein from the archaeon Aeropyrum pernix in complexes with ADP or a non-hydrolysable ATP analogue, ADPNP. Between two crystal forms, there are three crystallographically independent views of the ADP complex and two of the ADPNP complex. The protein molecules in the three complexes with ADP adopt very different conformations, while the two complexes with ADPNP are the same. These structures indicate that there is considerable conformational flexibility in ORC2 but that ATP binding stabilises a single conformation. We show that the ORC2 protein can bind DNA, and that this activity is associated with the C-terminal domain of the protein. We present a model for the interaction of the winged helix (WH) domain of ORC2 with DNA that differs from that proposed previously for Pyrobaculum aerophilum ORC/Cdc6.

PubMed: 15465044
DOI: 10.1016/J.JMB.2004.08.044

Experimental method

X-RAY DIFFRACTION (2.4 Å)