7p7d | pdb_00007p7d

Rabbit muscle Glycogen Phosphorylase T state

spinqualitylabelsall models 7p7d, resolution 1.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7p7d is a 1 chain structure with sequence from Oryctolagus cuniculus. This structure supersedes the now removed PDB entry 7o8e. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DMS NonStd Res: CSO, LLP Related: 1gpb Activity: Phosphorylase, with EC number 2.4.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PYGM_RABIT] Phosphorylase is an important allosteric enzyme in carbohydrate metabolism. Enzymes from different sources differ in their regulatory mechanisms and in their natural substrates. However, all known phosphorylases share catalytic and structural properties. Publication Abstract from PubMed The crystal structures of free T-state and R-state glycogen phosphorylase (GP) and of R-state GP in complex with the allosteric activators IMP and AMP are reported at improved resolution. GP is a validated pharmaceutical target for the development of antihyperglycaemic agents, and the reported structures may have a significant impact on structure-based drug-design efforts. Comparisons with previously reported structures at lower resolution reveal the detailed conformation of important structural features in the allosteric transition of GP from the T-state to the R-state. The conformation of the N-terminal segment (residues 7-17), the position of which was not located in previous T-state structures, was revealed to form an alpha-helix (now termed alpha0). The conformation of this segment (which contains Ser14, phosphorylation of which leads to the activation of GP) is significantly different between the T-state and the R-state, pointing in opposite directions. In the T-state it is packed between helices alpha4 and alpha16 (residues 104-115 and 497-508, respectively), while in the R-state it is packed against helix alpha1 (residues 22'-38') and towards the loop connecting helices alpha4' and alpha5' of the neighbouring subunit. The allosteric binding site where AMP and IMP bind is formed by the ordering of a loop (residues 313-326) which is disordered in the free structure, and adopts a conformation dictated mainly by the type of nucleotide that binds at this site. Glycogen phosphorylase revisited: extending the resolution of the R- and T-state structures of the free enzyme and in complex with allosteric activators.,Leonidas DD, Zographos SE, Tsitsanou KE, Skamnaki VT, Stravodimos G, Kyriakis E Acta Crystallogr F Struct Biol Commun. 2021 Sep 1;77(Pt 9):303-311. doi:, 10.1107/S2053230X21008542. Epub 2021 Aug 26. PMID:34473107 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glycogen phosphorylase 3D structures

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