Role of the middle residue in the triple tryptophan electron transfer chain of DNA photolyase: Ultrafast spectroscopy of a Trp --> Phe mutant

Article Abstract:

The early dynamics of engineered W359F mutant photolyase (PL) from Escherichia coli are studied and compared with the wild type (WT) enzyme by using spectrally resolved femtosecond absorption spectroscopy. The results have provided the first experimental indication that electron transfer (ET) between aromatic residues can take place on the time scale of approximately [10.sup.-12] s and has further indicated that the initial W382 --> [FADH.sup.*] ET step is rate limiting for oxidation of at least W359 and possibly even W306.

DNA polymerases, Absorption spectra, Structure

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Water-mediated electron transfer between protein redox centers

Article Abstract:

The effects of intervening water molecules on the electron self-exchange reaction of azurin (Az) are analyzed by performing a conformational sampling on the water medium. The results are discussed in terms of the interplay between different electron-transfer (ET) pathways controlled by the conformational changes of one of the water molecules through its electrostatic influence.

Water, Molecular dynamics, Metalloproteins

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Energetic probing for the electron transfer reactions sensitized by 9,10-dicyanoanthracene and 9-cyanoanthracene and their modified zeolite particles

Article Abstract:

The photooxidation of diphenylamine and triphenylphosphine (P(C6H5)(sub 3))sensitized by 9,10-dicyanoanthracene and 9-cyanoanthracene was investigated. The results suggested that (P(C6H5)(sub 3)(super +)), (P(C6H5)(sub 3)(super 2+)), (C6H5)(sub 3)C(super +) were generated.

Biphenyl (Compound)

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