Enhancement of the activity of the titanium catalyst for isoprene polymerization by improving the step of active site formation

2011 ◽  
Vol 84 (8) ◽  
pp. 1434-1437 ◽  
Author(s):  
Yu. V. Morozov ◽  
I. Sh. Nasyrov ◽  
V. P. Zakharov ◽  
V. Z. Mingaleev ◽  
Yu. B. Monakov
Keyword(s):  
Active Site ◽  
Site Formation ◽  
Titanium Catalyst ◽  
Isoprene Polymerization

Folding Mechanism of an Ankyrin Repeat Protein: Scaffold and Active Site Formation of Human CDK Inhibitor p19INK4d

2007 ◽  
Vol 373 (1) ◽  
pp. 219-231 ◽  
Author(s):  
Christian Löw ◽  
Ulrich Weininger ◽  
Markus Zeeb ◽  
Wei Zhang ◽  
Ernest D. Laue ◽  
...  
Keyword(s):  
Active Site ◽  
Ankyrin Repeat ◽  
Site Formation ◽  
Cdk Inhibitor ◽  
Protein Scaffold ◽  
Repeat Protein ◽  
Ankyrin Repeat Protein ◽  
Folding Mechanism

Single-molecule studies of DNA and RNA four-way junctions

2004 ◽  
Vol 32 (1) ◽  
pp. 41-45 ◽  
Author(s):  
S.A. McKinney ◽  
E. Tan ◽  
T.J. Wilson ◽  
M.K. Nahas ◽  
A.-C. Déclais ◽  
...  
Keyword(s):  
Single Molecule ◽  
Active Site ◽  
Dynamic Structure ◽  
Holliday Junctions ◽  
Site Formation ◽  
Structural Element ◽  
Fluorescence Studies ◽  
Definitive Evidence ◽  
Dna And Rna ◽  
Single Molecule Studies

Branched helical junctions are common in nucleic acids. In DNA, the four-way junction (Holliday junction) is an essential intermediate in homologous recombination and is a highly dynamic structure, capable of stacking conformer transitions and branch migration. Our single-molecule fluorescence studies provide unique insight into the energy landscape of Holliday junctions by visualizing these processes directly. In the hairpin ribozyme, an RNA four-way junction is an important structural element that enhances active-site formation by several orders of magnitude. Our single-molecule studies suggest a plausible mechanism for how the junction achieves this remarkable feat; the structural dynamics of the four-way junction bring about frequent contacts between the loops that are needed to form the active site. The most definitive evidence for this is the observation of three-state folding in single-hairpin ribozymes, the intermediate state of which is populated due to the intrinsic properties of the junction.

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