3who | pdb_00003who

X-ray-Crystallographic Structure of an RNase Po1 Exhibiting Anti-tumor Activity

spinqualitylabelsall models 3who, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3who is a 3 chain structure with sequence from Oyster mushroom. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: Ribonuclease T(1), with EC number 3.1.27.3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed RNase Po1 is a guanylic acid-specific ribonuclease member of the RNase T1 family from Pleurotus ostreatus. We previously reported that RNase Po1 inhibits the proliferation of human tumor cells, yet RNase T1 and other T1 family RNases are non-toxic. We determined the three-dimensional X-ray structure of RNase Po1 and compared it with that of RNase T1. The catalytic sites are conserved. However, there are three disulfide bonds, one more than in RNase T1. One of the additional disulfide bond is in the catalytic and binding site of RNase Po1, and makes RNase Po1 more stable than RNase T1. A comparison of the electrostatic potential of the molecular surfaces of these two proteins shows that RNase T1 is anionic whereas RNase Po1 is cationic, so RNase Po1 might bind to the plasma membrane electrostatically. We suggest that the structural stability and cationic character of RNase Po1 are critical to the anti-cancer properties of the protein. X-Ray Crystallographic Structure of RNase Po1 That Exhibits Anti-tumor Activity.,Kobayashi H, Katsutani T, Hara Y, Motoyoshi N, Itagaki T, Akita F, Higashiura A, Yamada Y, Inokuchi N, Suzuki M Biol Pharm Bull. 2014;37(6):968-78. PMID:24882409 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease 3D structures

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