Structural insights from the molybdenum K-edge x-ray absorption near edge structure of the iron-molybdenum protein of nitrogenase and its iron-molybdenum cofactor by comparison with synthetic iron-molybdenum-sulfur clusters

1985 ◽  
Vol 107 (26) ◽  
pp. 7935-7940 ◽  
Author(s):  
S. D. Conradson ◽  
B. K. Burgess ◽  
W. E. Newton ◽  
J. W. McDonald ◽  
J. F. Rubinson ◽  
...  
Keyword(s):  
Molybdenum Cofactor ◽  
Edge Structure ◽  
X Ray ◽  
Iron Molybdenum Cofactor ◽  
X Ray Absorption ◽  
Structural Insights

scholarly journals Comparison of Iron-Molybdenum Cofactor-deficient Nitrogenase MoFe Proteins by X-ray Absorption Spectroscopy

2004 ◽  
Vol 279 (27) ◽  
pp. 28276-28282 ◽  
Author(s):  
Mary C. Corbett ◽  
Yilin Hu ◽  
Farzad Naderi ◽  
Markus W. Ribbe ◽  
Britt Hedman ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Molybdenum Cofactor ◽  
X Ray ◽  
Iron Molybdenum Cofactor ◽  
X Ray Absorption

scholarly journals Selenol binds to iron in nitrogenase iron-molybdenum cofactor: an extended x-ray absorption fine structure study.

1994 ◽  
Vol 91 (4) ◽  
pp. 1290-1293 ◽  
Author(s):  
S. D. Conradson ◽  
B. K. Burgess ◽  
W. E. Newton ◽  
A. Di Cicco ◽  
A. Filipponi ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Study ◽  
Molybdenum Cofactor ◽  
X Ray ◽  
Absorption Fine ◽  
Iron Molybdenum Cofactor ◽  
X Ray Absorption

The molybdenum site of nitrogenase. 2. A comparative study of molybdenum-iron proteins and the iron-molybdenum cofactor by x-ray absorption spectroscopy

1978 ◽  
Vol 100 (12) ◽  
pp. 3814-3819 ◽  
Author(s):  
Stephen P. Cramer ◽  
William O. Gillum ◽  
Keith O. Hodgson ◽  
Leonard E. Mortenson ◽  
Edward I. Stiefel ◽  
...  
Keyword(s):  
Comparative Study ◽  
Absorption Spectroscopy ◽  
Molybdenum Cofactor ◽  
X Ray ◽  
Iron Proteins ◽  
Iron Molybdenum Cofactor ◽  
X Ray Absorption

scholarly journals Iron K-edge X-ray absorption spectroscopy of the iron-molybdenum cofactor of nitrogenase from Klebsiella pneumoniae

1988 ◽  
Vol 252 (2) ◽  
pp. 421-425 ◽  
Author(s):  
J M Arber ◽  
A C Flood ◽  
C D Garner ◽  
C A Gormal ◽  
S S Hasnain ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Long Range ◽  
Absorption Spectroscopy ◽  
Molybdenum Cofactor ◽  
Published Data ◽  
Absorption Data ◽  
X Ray ◽  
Chemical Models ◽  
Iron Molybdenum Cofactor ◽  
X Ray Absorption

Iron K-edge X-ray absorption data for the iron-molybdenum cofactor (‘FeMoco’) from Klebsiella pneumoniae reported here provide the first evidence for long-range structural order in the cofactor [Fe…Fe(Mo) = 0.368 nm in addition to Fe…S = 0.22 nm and Fe…Fe(Mo) = 0.27 nm] and, in contrast with previously published data [Antonio, Teo, Orme-Johnson, Nelson, Groh, Lindahl, Kauzlarich & Averill (1982) J. Am. Chem. Soc. 104, 4703-4705], indicate that most of the iron centres are not co-ordinated to light (oxygen, nitrogen) atoms. This demonstrates that presently available chemical models for FeMoco are inadequate.

Chemical and orientational imaging of polymeric samples

1994 ◽  
Vol 52 ◽  
pp. 68-69
Author(s):  
H. Ade ◽  
B. Hsiao ◽  
G. Mitchell ◽  
E. Rightor ◽  
A. P. Smith ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
National Laboratory ◽  
Brookhaven National Laboratory ◽  
Carbonyl Groups ◽  
Aromatic Rings ◽  
Edge Structure ◽  
X Ray ◽  
Scanning Transmission ◽  
Polymeric Samples ◽  
X Ray Absorption

We have used the Scanning Transmission X-ray Microscope at beamline X1A (X1-STXM) at Brookhaven National Laboratory (BNL) to acquire high resolution, chemical and orientation sensitive images of polymeric samples as well as point spectra from 0.1 μm areas. This sensitivity is achieved by exploiting the X-ray Absorption Near Edge Structure (XANES) of the carbon K edge. One of the most illustrative example of the chemical sensitivity achievable is provided by images of a polycarbonate/pol(ethylene terephthalate) (70/30 PC/PET) blend. Contrast reversal at high overall contrast is observed between images acquired at 285.36 and 285.69 eV (Fig. 1). Contrast in these images is achieved by exploring subtle differences between resonances associated with the π bonds (sp hybridization) of the aromatic groups of each polymer. PET has a split peak associated with these aromatic groups, due to the proximity of its carbonyl groups to its aromatic rings, whereas PC has only a single peak.

Protonation and Sulfido versus Oxo Ligation Changes at the Molybdenum Cofactor in Xanthine Dehydrogenase (XDH) Variants Studied by X-ray Absorption Spectroscopy

2017 ◽  
Vol 56 (4) ◽  
pp. 2165-2176 ◽  
Author(s):  
Stefan Reschke ◽  
Stefan Mebs ◽  
Kajsa G. V. Sigfridsson-Clauss ◽  
Ramona Kositzki ◽  
Silke Leimkühler ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Xanthine Dehydrogenase ◽  
Molybdenum Cofactor ◽  
X Ray ◽  
X Ray Absorption
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