Novel Insights into the Basis forEscherichia coliSuperoxide Dismutase's Metal Ion Specificity from Mn-Substituted FeSOD and Its Very HighEm†

Biochemistry ◽  
2001 ◽  
Vol 40 (43) ◽  
pp. 13079-13087 ◽  
Author(s):  
Carrie K. Vance ◽  
Anne-Frances Miller
Keyword(s):  
Metal Ion ◽  
Ion Specificity

Silver(I)‐Ion‐Mediated Cytosine‐Containing Base Pairs: Metal Ion Specificity for Duplex Stabilization and Susceptibility toward DNA Polymerases

ChemBioChem ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 517-522 ◽  
Author(s):  
Tatsuya Funai ◽  
Megumi Aotani ◽  
Risa Kiriu ◽  
Junko Nakamura ◽  
Yuki Miyazaki ◽  
...  
Keyword(s):  
Metal Ion ◽  
Dna Polymerases ◽  
Base Pairs ◽  
Ion Specificity

scholarly journals Mutation of outer-shell residues modulates metal ion co-ordination strength in a metalloenzyme

2010 ◽  
Vol 429 (2) ◽  
pp. 313-321 ◽  
Author(s):  
Jee-Loon Foo ◽  
Colin J. Jackson ◽  
Paul D. Carr ◽  
Hye-Kyung Kim ◽  
Gerhard Schenk ◽  
...  
Keyword(s):  
Metal Ion ◽  
Structural Data ◽  
Biochemical Properties ◽  
Outer Shell ◽  
Model Systems ◽  
Spectroscopic Techniques ◽  
Structural Determinants ◽  
Ion Specificity ◽  
X Ray Crystallography ◽  
Metal Ion Interactions

The metal ion co-ordination sites of many metalloproteins have been characterized by a variety of spectroscopic techniques and small-molecule model systems, revealing many important insights into the structural determinants of metal ion co-ordination. However, our understanding of this fundamentally and practically important phenomenon remains frustratingly simplistic; in many proteins it is essentially impossible to predict metal ion specificity and the effects of remote ‘outer-shell’ residues on metal ion co-ordination strength are also poorly defined. This is exemplified by our inability to explain why metalloenzymes with identical metal ion co-ordination spheres, such as the closely related orthologues of bacterial PTE (phosphotriesterase) from Agrobacterium radiobacter and Pseudomonas diminuta, display different metal ion specificity and co-ordination strength. In the present study, we present a series of PTE variants that all possess identical metal ion co-ordination spheres, yet display large differences in their metal ion co-ordination strength. Using measurement of the rates of metal ion dissociation from the active site alongside analysis of structural data obtained through X-ray crystallography, we show that ‘outer-shell’ residues provide essential support for the metal ion ligands, in effect buttressing them in their optimal orientation. Remote mutations appear to modulate metal ion interactions by increasing or decreasing the stabilizing effects of these networks. The present study therefore provides a description of how the greater protein fold can be modified to ‘tune’ the strength of metal ion co-ordination and metal ion specificity, as well as reinforcing the concept of proteins as ensembles of conformational states with unique structures and biochemical properties.

Metal ion specificity in the oxidation of the coordinated mercapto group

1978 ◽  
Vol 17 (7) ◽  
pp. 2037-2039 ◽  
Author(s):  
Paul R. Butler ◽  
Elliott L. Blinn
Keyword(s):  
Metal Ion ◽  
Mercapto Group ◽  
Ion Specificity

Metal ion specificity at the catalytic site of yeast enolase

Biochemistry ◽  
1992 ◽  
Vol 31 (7) ◽  
pp. 2172-2180 ◽  
Author(s):  
Myoung Eun Lee ◽  
Thomas Nowak
Keyword(s):  
Metal Ion ◽  
Catalytic Site ◽  
Ion Specificity ◽  
Yeast Enolase
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