3ctk

Crystal structure of the type 1 RIP bouganin

spinqualitylabelsall models 3ctk, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ctk is a 1 chain structure with sequence from Bougainvillea spectabilis. This structure supersedes the now removed PDB entry 1wuc. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: rRNA N-glycosylase, with EC number 3.2.2.22 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The three-dimensional structures of two type 1 RIPs, bouganin and lychnin, has been solved. Their adenine polynucleotide glycosylase activity was also determined together with other known RIPs: dianthin 30, PAP-R, momordin I, ricin A chain and saporin-S6. Saporin-S6 releases the highest number of adenine molecules from rat ribosomes, and poly(A), while its efficiency is similar to dianthin 30, bouganin and PAP-R on herring sperm DNA. Measures of the protein synthesis inhibitory activity confirmed that saporin-S6 is the most active. The overall structure of bouganin and lychnin is similar to the other considered RIPs and the typical RIP fold is conserved. The superimpositioning of their C(alpha) atoms highlights some differences in the N-terminal and C-terminal domains. A detailed structural analysis indicates that the efficiency of saporin-S6 on various polynucleotides can be ascribed to a negative electrostatic surface potential at the active site and several exposed positively charged residues in the region around that site. These two conditions, not present at the same time in other examined RIPs, could guarantee an efficient interaction with the substrate and an efficient catalysis. Structure/function studies on two type 1 ribosome inactivating proteins: Bouganin and lychnin.,Fermani S, Tosi G, Farini V, Polito L, Falini G, Ripamonti A, Barbieri L, Chambery A, Bolognesi A J Struct Biol. 2009 Nov;168(2):278-87. Epub 2009 Jul 16. PMID:19616098 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosome inactivating protein

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