Access to the Active Site of Periplasmic Nitrate Reductase:  Insights from Site-Directed Mutagenesis and Zinc Inhibition Studies†

Biochemistry ◽  
2007 ◽  
Vol 46 (34) ◽  
pp. 9713-9721 ◽  
Author(s):  
Sébastien Dementin ◽  
Pascal Arnoux ◽  
Bettina Frangioni ◽  
Sandrine Grosse ◽  
Christophe Léger ◽  
...  
Keyword(s):  
Nitrate Reductase ◽  
Active Site ◽  
Site Directed Mutagenesis ◽  
Directed Mutagenesis ◽  
Periplasmic Nitrate Reductase ◽  
Zinc Inhibition ◽  
Inhibition Studies

scholarly journals Threonine 57 is required for the post-translational activation ofEscherichia coliaspartate α-decarboxylase

2014 ◽  
Vol 70 (4) ◽  
pp. 1166-1172 ◽  
Author(s):  
Michael E. Webb ◽  
Briony A. Yorke ◽  
Tom Kershaw ◽  
Sarah Lovelock ◽  
Carina M. C. Lobley ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Active Site ◽  
Site Directed Mutagenesis ◽  
Intramolecular Rearrangement ◽  
Directed Mutagenesis ◽  
Vitamin B ◽  
Biosynthesis Pathway ◽  
Serine Residue ◽  
Translational Activation

Aspartate α-decarboxylase is a pyruvoyl-dependent decarboxylase required for the production of β-alanine in the bacterial pantothenate (vitamin B5) biosynthesis pathway. The pyruvoyl group is formedviathe intramolecular rearrangement of a serine residue to generate a backbone ester intermediate which is cleaved to generate an N-terminal pyruvoyl group. Site-directed mutagenesis of residues adjacent to the active site, including Tyr22, Thr57 and Tyr58, reveals that only mutation of Thr57 leads to changes in the degree of post-translational activation. The crystal structure of the site-directed mutant T57V is consistent with a non-rearranged backbone, supporting the hypothesis that Thr57 is required for the formation of the ester intermediate in activation.

Enzyme activity enhancement of chondroitinase ABC I from Proteus vulgaris by site-directed mutagenesis

RSC Advances ◽  
2015 ◽  
Vol 5 (93) ◽  
pp. 76040-76047 ◽  
Author(s):  
Zhenya Chen ◽  
Ye Li ◽  
Yue Feng ◽  
Liang Chen ◽  
Qipeng Yuan
Keyword(s):  
Active Site ◽  
Simulation Analysis ◽  
Docking Simulation ◽  
Site Directed Mutagenesis ◽  
Directed Mutagenesis ◽  
Wild Type ◽  
Proteus Vulgaris ◽  
Molecular Docking Simulation ◽  
Activity Enhancement ◽  
First Time

Arg660 was found as a new active site and Asn795Ala and Trp818Ala mutants showed higher activities than the wild type based on molecular docking simulation analysis for the first time.

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