Pathway of Proton Transfer in Bacterial Reaction Centers: Role of Aspartate-L213 in Proton Transfers Associated with Reduction of Quinone to Dihydroquinone

Biochemistry ◽  
1994 ◽  
Vol 33 (3) ◽  
pp. 734-745 ◽  
Author(s):  
M. L. Paddock ◽  
S. H. Rongey ◽  
P. H. McPherson ◽  
A. Juth ◽  
G. Feher ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Reaction Centers ◽  
Bacterial Reaction Centers ◽  
Proton Transfers

Determination of Proton Transfer Rates by Chemical Rescue:  Application to Bacterial Reaction Centers†

Biochemistry ◽  
2002 ◽  
Vol 41 (50) ◽  
pp. 14716-14725 ◽  
Author(s):  
M. L. Paddock ◽  
P. Ädelroth ◽  
G. Feher ◽  
M. Y. Okamura ◽  
J. T. Beatty
Keyword(s):  
Proton Transfer ◽  
Reaction Centers ◽  
Transfer Rates ◽  
Chemical Rescue ◽  
Bacterial Reaction Centers

scholarly journals Proton transfer pathways and mechanism in bacterial reaction centers

FEBS Letters ◽  
2003 ◽  
Vol 555 (1) ◽  
pp. 45-50 ◽  
Author(s):  
M.L. Paddock ◽  
G. Feher ◽  
M.Y. Okamura
Keyword(s):  
Proton Transfer ◽  
Reaction Centers ◽  
Bacterial Reaction Centers

Excited-State Proton Transfer: Molecules in a Hurry to Get Rid of Antiaromaticity

2019 ◽  
Author(s):  
Chia-Hua Wu ◽  
Lucas Karas ◽  
Henrik Ottosson ◽  
Judy Wu
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Chemical Shifts ◽  
Proton Relay ◽  
Proton Transfers ◽  
Bifunctional Compounds ◽  
Excited State Proton Transfer ◽  
Derivatives Of ◽  
Related Compounds

<p>Baird’s rule explains why and when excited-state proton transfer (ESPT) reactions happen in organic compounds. Bifunctional compounds that are [4<i>n</i>+2] π-aromatic in the ground state, become [4<i>n</i>+2] π-antiaromatic in the first <sup>1</sup>ππ* states, and proton transfer (either<i>inter-</i>or <i>intra-</i>molecularly) helps relieve excited-state antiaromaticity. Computed nucleus independent chemical shifts (NICS) for several ESPT examples (including excited-state intramolecular proton transfers (ESIPT), biprotonic transfers, dynamic catalyzed transfers, and proton relay transfers) document the important role of excited-state antiaromaticity. <i>o-</i>Salicylic acid undergoes ESPT only in the “antiaromatic” S<sub>1</sub>(<sup>1</sup>ππ*) state, but not in the “aromatic” S<sub>2</sub>(<sup>1</sup>ππ*) state. Stokes’ shifts of structurally-related compounds (<i>e.g.</i>, derivatives of 2-(2-hydroxyphenyl)benzoxazole and hydrogen-bonded complexes of 2-aminopyridine with pro tic substrates) vary depending on the antiaromaticity of the photoinduced tautomers. Remarkably, Baird’s rule predicts the effect of light on hydrogen bond strengths; hydrogen bonds that enhance (and reduce) excited-state antiaromaticity in compounds become weakened (and strengthened) upon photoexcitation.</p>

scholarly journals Determination of the binding sites of the proton transfer inhibitors Cd2+ and Zn2+ in bacterial reaction centers

2000 ◽  
Vol 97 (4) ◽  
pp. 1542-1547 ◽  
Author(s):  
H. L. Axelrod ◽  
E. C. Abresch ◽  
M. L. Paddock ◽  
M. Y. Okamura ◽  
G. Feher
Keyword(s):  
Proton Transfer ◽  
Binding Sites ◽  
Reaction Centers ◽  
Bacterial Reaction Centers
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