Faculty Opinions recommendation of Three Aromatic Residues are Required for Electron Transfer during Iron Mineralization in Bacterioferritin.

2015 ◽  
Author(s):  
Victor Davidson
Keyword(s):  
Electron Transfer ◽  
Aromatic Residues

scholarly journals Three Aromatic Residues are Required for Electron Transfer during Iron Mineralization in Bacterioferritin

2015 ◽  
Vol 54 (49) ◽  
pp. 14763-14767 ◽  
Author(s):  
Justin M. Bradley ◽  
Dimitri A. Svistunenko ◽  
Tamara L. Lawson ◽  
Andrew M. Hemmings ◽  
Geoffrey R. Moore ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Aromatic Residues

Aromatic Residues May Enhance Intramolecular Electron Transfer in Azurin

1997 ◽  
Vol 119 (23) ◽  
pp. 5453-5454 ◽  
Author(s):  
Ole Farver ◽  
Lars K. Skov ◽  
Simon Young ◽  
Nicklas Bonander ◽  
B. Göran Karlsson ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Intramolecular Electron Transfer ◽  
Aromatic Residues

Regulation of interprotein electron transfer by residue 82 of yeast cytochrome c

Science ◽  
1988 ◽  
Vol 240 (4850) ◽  
pp. 311-313 ◽  
Author(s):  
N Liang ◽  
AG Mauk ◽  
GJ Pielak ◽  
JA Johnson ◽  
M Smith ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Cytochrome C ◽  
Long Range ◽  
Transfer Process ◽  
Cytochrome C Peroxidase ◽  
Electron Transfer Process ◽  
Aromatic Residues ◽  
Transfer Step

Yeast iso-1-cytochrome c (Cc) mutants have been constructed with Phe, Tyr, Gly, Ser, Leu, and Ile at position 82, each with Thr substituted for Cys at position 102. Their long-range electron transfer with zinc-substituted cytochrome c peroxidase (ZnCcP) has been studied by two kinetic techniques. The charge-separated complex, [(ZnCcP)+,FeIICc] converts to [ZnCcP,FeIIICc] by a single, intracomplex electron transfer step that is not governed by "gating" through possible rapid dissociation of the complex or isomerization (for example, heme-ligand) by FeIICc subsequent to its formation from FeIIICc. In every variant with an aliphatic residue at position 82 of Cc, the rate of this electron transfer process is approximately 10(4) slower at approximately 0 degrees C than for the two variants with aromatic residues.

scholarly journals Direct Extracellular Electron Transfer of the Geobacter sulfurreducens Pili Relevant to Interaromatic Distances

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Chuanjun Shu ◽  
Qiang Zhu ◽  
Ke Xiao ◽  
Yue Hou ◽  
Haibo Ma ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Type Iv Pili ◽  
Geobacter Sulfurreducens ◽  
Transfer Reactions ◽  
Extracellular Electron Transfer ◽  
Aromatic Residues ◽  
New Class ◽  
Type Iv ◽  
Pilin Subunit ◽  
Potential Applications

Microorganisms can transfer electrons directly to extracellular acceptors, during which organic compounds are oxidized to carbon dioxide. One of these microbes, Geobacter sulfurreducens, is well known for the “metallic-like” conductivity of its type IV pili. However, there is no consensus on what the mechanism for electron transfer along these conductive pili is. Based on the aromatic distances and orientations of our predicted models, the mechanism of electron transfer in the Geobacter sulfurreducens (GS) pili was explored by quantum chemical calculations with Marcus theory of electron transfer reactions. Three aromatic residues from the N-terminal α-helix of the GS pilin subunit are packed together, resulting in a continuous pi-pi interaction chain. The theoretical conductance (4.69 μS/3.85 μS) of the predicted models is very similar to that in the experiments reported recently (3.40 μS). These findings offer a new concept that the GS pili belongs to a new class of proteins that can transport electrons through pi-pi interaction between aromatic residues and also provide a valuable tool for guiding further researches of these conductive pili, to investigate their roles in biogeochemical cycling, and potential applications in biomaterials, bioelectronics, and bioenergy.

scholarly journals Three Aromatic Residues are Required for Electron Transfer during Iron Mineralization in Bacterioferritin

2015 ◽  
Vol 127 (49) ◽  
pp. 14976-14980 ◽  
Author(s):  
Justin M. Bradley ◽  
Dimitri A. Svistunenko ◽  
Tamara L. Lawson ◽  
Andrew M. Hemmings ◽  
Geoffrey R. Moore ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Aromatic Residues

Electron transfer in ruthenium-modified cytochromes c. .sigma.-tunneling pathways through aromatic residues

1993 ◽  
Vol 97 (50) ◽  
pp. 13073-13077 ◽  
Author(s):  
Danilo R. Casimiro ◽  
John H. Richards ◽  
Jay R. Winkler ◽  
Harry B. Gray
Keyword(s):  
Electron Transfer ◽  
Aromatic Residues ◽  
Cytochromes C ◽  
Tunneling Pathways

scholarly journals Functional role of an unusual tyrosine residue in the electron transfer chain of a prokaryotic (6–4) photolyase

2018 ◽  
Vol 9 (5) ◽  
pp. 1259-1272 ◽  
Author(s):  
Daniel Holub ◽  
Hongju Ma ◽  
Norbert Krauß ◽  
Tilman Lamparter ◽  
Marcus Elstner ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Functional Role ◽  
Tyrosine Residue ◽  
Aromatic Residues ◽  
Electron Transfer Chain ◽  
Transfer Chain

FAD photoreduction mechanism by different aromatic residues in a phylogenetically ancient photolyase.

The influence of conserved aromatic residues on the electron transfer reactivity of 2[4Fe-4S] ferredoxins

1996 ◽  
Vol 1295 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Isabelle Quinkal ◽  
Panayotis Kyritsis ◽  
Takamitsu Kohzuma ◽  
Sang-Choul Im ◽  
A.Geoffrey Sykes ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Aromatic Residues

A light optical diffractometer for electron microscopical images operating in line

1978 ◽  
Vol 36 (1) ◽  
pp. 86-87
Author(s):  
P. Bonhomme ◽  
A. Beorchia
Keyword(s):  
Electron Microscopy ◽  
Electron Transfer ◽  
Electron Microscope ◽  
Image Converter ◽  
Coherent Light ◽  
Spatial Filters ◽  
Electron Image ◽  
Electron Microscopical ◽  
Working Parameters ◽  
Amorphous Part

We have already described (1.2.3) a device using a pockel's effect light valve as a microscopical electron image converter. This converter can be read out with incoherent or coherent light. In the last case we can set in line with the converter an optical diffractometer. Now, electron microscopy developments have pointed out different advantages of diffractometry. Indeed diffractogram of an image of a thin amorphous part of a specimen gives information about electron transfer function and a single look at a diffractogram informs on focus, drift, residual astigmatism, and after standardizing, on periods resolved (4.5.6). These informations are obvious from diffractogram but are usualy obtained from a micrograph, so that a correction of electron microscope parameters cannot be realized before recording the micrograph. Diffractometer allows also processing of images by setting spatial filters in diffractogram plane (7) or by reconstruction of Fraunhofer image (8). Using Electrotitus read out with coherent light and fitted to a diffractometer; all these possibilities may be realized in pseudoreal time, so that working parameters may be optimally adjusted before recording a micrograph or before processing an image.

Sign in / Sign up

Export Citation Format

Share Document