3ql2 | pdb_00003ql2

Crystal Structure of Ribonuclease A Variant A4C/D83E/V118C

spinqualitylabelsall models 3ql2, resolution 1.49Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ql2 is a 2 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 3ql1 Gene: RNASE1, RNS1 (BOVIN) Activity: Pancreatic ribonuclease, with EC number 3.1.27.5 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RNAS1_BOVIN] Endonuclease that catalyzes the cleavage of RNA on the 3' side of pyrimidine nucleotides. Acts on single stranded and double stranded RNA. Publication Abstract from PubMed Among the strategies that employ genetic engineering to stabilize proteins, the introduction of disulfide bonds has proven to be a very potential approach. As, however, the replacement of amino acid residues by cysteines and the subsequent formation of the covalent bond can result in a severe deformation of the parental protein structure, the stabilization effect is strongly context dependent. Alternatively, the introduction of charged amino acid residues at the surface, which may result in the formation of extra ionic interactions or hydrogen bonds, provide propitious means for protein stabilization. The generation of an extra disulfide bond between residues 4 and 118 in ribonuclease A had resulted in a stabilization by 6 degrees C or 7 kJ mol(-1) , which was mainly caused by a deceleration of the unfolding reaction [Pecher, P. & Arnold, U. (2009) Biophys Chem, 141, 21-28]. Here, Asp83 was replaced by Glu resulting in a comparable stabilization. Moreover, combination of both mutations led to an additive effect and the resulting ribonuclease A variant (T(m) approximately 76 degrees C, DeltaG degrees approximately 53 kJ mol(-1) ) is the most stable ribonuclease A variant described so far. The analysis of the crystal structure of A4C/D83E/V118C-ribonuclease A reveals the formation of a salt bridge between the gamma-carboxyl group of Glu83 and the epsilon-amino group of Lys104. Enzymes Ribonuclease (EC3.1.27.5) Structured digital abstract * RNase A and RNase A bind by x-ray crystallography (View interaction). Significant stabilization of ribonuclease A by additive effects.,Arnold U, Schopfel M FEBS J. 2012 May 17. doi: 10.1111/j.1742-4658.2012.08632.x. PMID:22594773 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease Temp

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