3rdi

Domain-domain flexibility leads to allostery within the camp receptor protein (CRP)

spinqualitylabelsall models 3rdi, resolution 2.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3rdi is a 2 chain structure with sequence from Ecoli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CMP Related: 1il6, 1i5z, 3qop Gene: b3357, cap, crp, csm, JW5702 (ECOLI) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CRP_ECOLI] This protein complexes with cyclic AMP and binds to specific DNA sites near the promoter to regulate the transcription of several catabolite-sensitive operons. The protein induces a severe bend in the DNA. Acts as a negative regulator of its own synthesis as well as for adenylate cyclase (cyaA), which generates cAMP. Publication Abstract from PubMed The structure of a dimer of the Escherichia coli catabolite gene activator protein has been refined at 2.5 A resolution to a crystallographic R-factor of 20.7% starting with coordinates fitted to the map at 2.9 A resolution. The two subunits are in different conformations and each contains one bound molecule of the allosteric activator, cyclic AMP. The amino-terminal domain is linked to the smaller carboxy-terminal domain by a nine-residue hinge region that exists in different conformations in the two subunits, giving rise to approximately a 30 degree rotation between the positions of the small domains relative to the larger domains. The amino-terminal domain contains an antiparallel beta-roll structure in which the interstrand hydrogen bonding is well-determined. The beta-roll can be described as a long antiparallel beta-ribbon that folds into a right-handed supercoil and forms part of the cyclic AMP binding site. Each cyclic AMP molecule is in an anti conformation and has ionic and hydrogen bond interactions with both subunits. Structure of a complex of catabolite gene activator protein and cyclic AMP refined at 2.5 A resolution.,Weber IT, Steitz TA J Mol Biol. 1987 Nov 20;198(2):311-26. PMID:2828639 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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