5nv3

Structure of Rubisco from Rhodobacter sphaeroides in complex with CABPStructure of Rubisco from Rhodobacter sphaeroides in complex with CABP

5nv3, resolution 3.39Å Show:Asymmetric Unit Biological Assembly Structural highlights 5nv3 is a 16 chain structure with sequence from "rhodococcus_capsulatus"_molisch_1907 "rhodococcus capsulatus" molisch 1907. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Gene: cbbL, cbbL1, rbcL ("Rhodococcus capsulatus" Molisch 1907), cbbS, rbcS ("Rhodococcus capsulatus" Molisch 1907) Activity: Ribulose-bisphosphate carboxylase, with EC number 4.1.1.39 Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RBL1_RHOSH] RuBisCO catalyzes two reactions: the carboxylation of D-ribulose 1,5-bisphosphate, the primary event in carbon dioxide fixation, as well as the oxidative fragmentation of the pentose substrate. Both reactions occur simultaneously and in competition at the same active site.[HAMAP-Rule:MF_01338] [RBS1_RHOSH] RuBisCO catalyzes two reactions: the carboxylation of D-ribulose 1,5-bisphosphate, the primary event in carbon dioxide fixation, as well as the oxidative fragmentation of the pentose substrate. Both reactions occur simultaneously and in competition at the same active site. Publication Abstract from PubMed How AAA+ chaperones conformationally remodel specific target proteins in an ATP-dependent manner is not well understood. Here, we investigated the mechanism of the AAA+ protein Rubisco activase (Rca) in metabolic repair of the photosynthetic enzyme Rubisco, a complex of eight large (RbcL) and eight small (RbcS) subunits containing eight catalytic sites. Rubisco is prone to inhibition by tight-binding sugar phosphates, whose removal is catalyzed by Rca. We engineered a stable Rca hexamer ring and analyzed its functional interaction with Rubisco. Hydrogen/deuterium exchange and chemical crosslinking showed that Rca structurally destabilizes elements of the Rubisco active site with remarkable selectivity. Cryo-electron microscopy revealed that Rca docks onto Rubisco over one active site at a time, positioning the C-terminal strand of RbcL, which stabilizes the catalytic center, for access to the Rca hexamer pore. The pulling force of Rca is fine-tuned to avoid global destabilization and allow for precise enzyme repair. Mechanism of Enzyme Repair by the AAA+ Chaperone Rubisco Activase.,Bhat JY, Milicic G, Thieulin-Pardo G, Bracher A, Maxwell A, Ciniawsky S, Mueller-Cajar O, Engen JR, Hartl FU, Wendler P, Hayer-Hartl M Mol Cell. 2017 Jul 20. pii: S1097-2765(17)30498-7. doi:, 10.1016/j.molcel.2017.07.004. PMID:28803776 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also RuBisCO 3D structures