A Solvolytic C−C Cleavage Reaction of 6-Acetoxycyclohexa-2,4-dienones:  Mechanistic Implications for the Intradiol Catechol Dioxygenases

2001 ◽  
Vol 66 (6) ◽  
pp. 2091-2097 ◽  
Author(s):  
Kirstin L. Eley ◽  
Patrick J. Crowley ◽  
Timothy D. H. Bugg
Keyword(s):  
Cleavage Reaction ◽  
Catechol Dioxygenases

scholarly journals Staring at the Naked Goddess: Unraveling the Structure and Reactivity of Artemis Endonuclease Interacting with a DNA Double Strand

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3986
Author(s):  
Cécilia Hognon ◽  
Antonio Monari
Keyword(s):  
Dna Cleavage ◽  
Catalytic Mechanism ◽  
Dna Lesions ◽  
Cleavage Reaction ◽  
Dynamic Simulations ◽  
Important Target ◽  
System Adaptation ◽  
Dna Strands ◽  
Dna Strand ◽  
Dna Substrate

Artemis is an endonuclease responsible for breaking hairpin DNA strands during immune system adaptation and maturation as well as the processing of potentially toxic DNA lesions. Thus, Artemis may be an important target in the development of anticancer therapy, both for the sensitization of radiotherapy and for immunotherapy. Despite its importance, its structure has been resolved only recently, and important questions concerning the arrangement of its active center, the interaction with the DNA substrate, and the catalytic mechanism remain unanswered. In this contribution, by performing extensive molecular dynamic simulations, both classically and at the hybrid quantum mechanics/molecular mechanics level, we evidenced the stable interaction modes of Artemis with a model DNA strand. We also analyzed the catalytic cycle providing the free energy profile and key transition states for the DNA cleavage reaction.

Label-free fluorescence assay coupled exonuclease reaction and SYBR Green I for the detection of T4 polynucleotide kinase activity

2020 ◽  
Vol 12 (6) ◽  
pp. 807-812
Author(s):  
Xu Wu ◽  
Shuyi He ◽  
Julia Xiaojun Zhao
Keyword(s):  
Kinase Activity ◽  
Sybr Green ◽  
Fluorescence Assay ◽  
Sybr Green I ◽  
Label Free ◽  
Cleavage Reaction ◽  
Polynucleotide Kinase ◽  
T4 Polynucleotide Kinase

A sensitive label-free fluorescence assay for monitoring T4 polynucleotide kinase (T4 PNK) activity and inhibition was developed based on a coupled λ exonuclease cleavage reaction and SYBR Green I.

Nitro–Nitrite Isomerization and Transition State Switching in the Dissociation of Ionized Nitromethane: A Threshold Photoelectron–Photoion Coincidence Spectroscopy Study

2009 ◽  
Vol 15 (2) ◽  
pp. 157-166 ◽  
Author(s):  
Brandon Ferrier ◽  
Anne-Marie Boulanger ◽  
David M.P. Holland ◽  
David A. Shaw ◽  
Paul M. Mayer
Keyword(s):  
Transition State ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Bond Cleavage ◽  
Cleavage Reaction ◽  
Nitrite Ion ◽  
Methyl Nitrite ◽  
Bond Cleavage Reaction ◽  
Entropy Of Activation ◽  
Lower Entropy

Threshold photoelectron–photoion coincidence (TPEPICO) spectroscopy has been employed to investigate the competition between bond cleavage and rearrangement reactions in the dissociation of ionized nitromethane, 1. Modeling TPEPICO breakdown diagrams with a combination of RRKM theory and ab initio calculations at the G3 level of theory allowed the derivation of the activation energy for the isomerisation of 1 to ionized methyl nitrite, 2, 82 kJ mol−1. In addition, evidence was found for a transition state switch in the bond cleavage reaction in 1 leading to CH3• + NO2+. As internal energy increases, the effective transition state for this reaction becomes tighter (i.e. is characterized by a lower entropy of activation, Δ‡S). Fitted thresholds for NO+ and CH2OHO+ ions, originating from the isomeric methyl nitrite ion, are consistent with G3 level ab initio calculations.

scholarly journals Cleavage reaction of HDV ribozymes in the presence of Mg2+ is accompanied by a conformational change

2002 ◽  
Vol 7 (6) ◽  
pp. 567-579 ◽  
Author(s):  
Yoichiro Tanaka ◽  
Mitsuhiro Tagaya ◽  
Tamaki Hori ◽  
Taiichi Sakamoto ◽  
Yasuyuki Kurihara ◽  
...  
Keyword(s):  
Conformational Change ◽  
Cleavage Reaction

Biosynthesis of C11 and C16 homoterpenes in higher plants; stereochemistry of the CC-bond cleavage reaction

Tetrahedron ◽  
1998 ◽  
Vol 54 (49) ◽  
pp. 14725-14736 ◽  
Author(s):  
Wilhelm Boland ◽  
Andreas Gäbler ◽  
Matthias Gilbert ◽  
Zhuofu Feng
Keyword(s):  
Higher Plants ◽  
Bond Cleavage ◽  
Cleavage Reaction ◽  
Bond Cleavage Reaction

A novel CC bond cleavage reaction of 2, 2′-pyridil in solution

2010 ◽  
Vol 19 (11) ◽  
pp. 1116-1118
Author(s):  
Rui Ren ◽  
Pin Yang ◽  
Xiang-Lin Jin
Keyword(s):  
Bond Cleavage ◽  
Cleavage Reaction ◽  
Bond Cleavage Reaction
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