1par | pdb_00001par

DNA RECOGNITION BY BETA-SHEETS IN THE ARC REPRESSOR-OPERATOR CRYSTAL STRUCTURE

spinqualitylabelsall models 1par, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1par is a 6 chain structure with sequence from Enterobacteria phage p22. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Function [RARC_BPP22] This protein acts as a transcriptional repressor of its own gene arc and of gene ant. Publication Abstract from PubMed Transcription of the ant gene during lytic growth of bacteriophage P22 (ref. 1) is regulated by the cooperative binding of two Arc repressor dimers to a 21-base-pair operator site. Here we report the co-crystal structure of this Arc tetramer-operator complex at 2.6 A resolution. As expected from genetic and structural studies and from the co-crystal structure of the homologous Escherichia coli MetJ repressor, each Arc dimer uses an antiparallel beta-sheet to recognize bases in the major groove. However, the Arc and MetJ complexes differ in several important ways: the beta-sheet-DNA interactions of Arc are far less symmetrical; DNA binding by Arc is accompanied by important conformational changes in the beta-sheet; and Arc uses a different part of its protein surface for dimer-dimer interactions. DNA recognition by beta-sheets in the Arc repressor-operator crystal structure.,Raumann BE, Rould MA, Pabo CO, Sauer RT Nature. 1994 Feb 24;367(6465):754-7. PMID:8107872 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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