Nuclear magnetic resonance study of the proton exchange rate in the operator-promoter DNA sequence of the trp operon of Escherichia coli

1985 ◽  
Vol 185 (4) ◽  
pp. 689-699 ◽  
Author(s):  
Jean-François Lefevre ◽  
Andrew N. Lane ◽  
Oleg Jardetzky
Keyword(s):  
Escherichia Coli ◽  
Nuclear Magnetic Resonance ◽  
Exchange Rate ◽  
Magnetic Resonance ◽  
Dna Sequence ◽  
Nuclear Magnetic Resonance Study ◽  
Proton Exchange ◽  
Magnetic Resonance Study ◽  
Promoter Dna ◽  
Trp Operon

A 19F nuclear magnetic resonance study of the exchange of the fluoro ligands of the tetrafluoroberyllium(II) ion

1977 ◽  
Vol 30 (2) ◽  
pp. 271 ◽  
Author(s):  
SF Lincoln ◽  
AC Sandercock ◽  
DR Stranks
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Exchange Rate ◽  
Magnetic Resonance ◽  
Exchange Process ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Rate Law ◽  
The Exchange Rate ◽  
Nuclear Magnetic

A 19F N.M.R. study is reported of the exchange of the fluoro ligands of [BeF4]2-. The exchange rate law is: ����������� rate = kobs4[BeF42-] = k'4[BeF42-]+ k''4[BeF42-][BeF3H2O-] where k'(298 K) = 69�3 s-1, ΔH‡ = 30�3 kJ mol-1, ΔS‡ = -110�10 J mol-1 K-1 and k''(298 K) = (1.6�0.5)×103 dm3 mol-1 s-1, ΔH‡ = 26�3 kJ mol-1, ΔS‡ = - 96�9 J mol-1 K-1. The k' exchange process appears to be predominantly dissociative in nature, and the k'' exchange process apparently proceeds through a fluoro bridged species [Be2F7]2-.

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