1972
DOI: 10.1073/pnas.69.11.3278
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The Possible Role of Aromatic Residues of Clostridium acidi-urici Ferredoxin in Electron Transport

Abstract: The 13C-resonances of the 2',6'-ring carbon atoms of both tyrosyl residues of Clostridium acidi-urici ferredoxin are shifted downfield in the oxidized and reduced protein relative to these resonance positions in free tyrosine. These results show that both tyrosyl residues in the oxidized and reduced protein are in magnetically equivalent environments, and suggest that both tyrosyl residues are close to the two iron-sulfur clusters in the reduced and oxidized proteins and that each cluster is equally accessible… Show more

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Cited by 42 publications
(13 citation statements)
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“…They may readily form radical anions, transfer the electron to the metal centre and then, through a general conformational change, move away from 'contact' with the chromophore so that further transfer is prevented. Similar interactions, between aromatic residues and the metal chromophore, are evident in the structure of flavodoxin (Watenpaugh, Sieker, Jensen, Legall & Dubourdieu, 1972) and have been inferred (from laC n.m.r, data) in a second ferredoxin (C. acidi urici) (Packer, Sternlicht & Rabinowitz, 1972). The packing arrangement in the present complexes would also appear to implicate the phenyl substituents in the charge-transfer process.…”
Section: Electron-transfer Metalloenzymessupporting
confidence: 82%
“…They may readily form radical anions, transfer the electron to the metal centre and then, through a general conformational change, move away from 'contact' with the chromophore so that further transfer is prevented. Similar interactions, between aromatic residues and the metal chromophore, are evident in the structure of flavodoxin (Watenpaugh, Sieker, Jensen, Legall & Dubourdieu, 1972) and have been inferred (from laC n.m.r, data) in a second ferredoxin (C. acidi urici) (Packer, Sternlicht & Rabinowitz, 1972). The packing arrangement in the present complexes would also appear to implicate the phenyl substituents in the charge-transfer process.…”
Section: Electron-transfer Metalloenzymessupporting
confidence: 82%
“…Soon after that, NMR spectroscopy was applied on other paramagnetic proteins such as single iron rubredoxins [ 4 ] and on Fe–S cluster containing proteins [ 5 , 6 ]. In combination with EPR, Mössbauer and magnetic susceptibility measurements, 1 H NMR spectroscopy significantly contributed, since the early days of research on Fe–S proteins, to elucidate the electronic structure and magnetic coupling among the iron ions in Fe–S clusters [ 7 11 ]. Small electron transfer proteins such as rubredoxins, ferredoxins and HiPIPs are paradigmatic examples of how solution NMR can easily identify different types of Fe–S clusters and different oxidation states.…”
Section: Introductionmentioning
confidence: 99%
“…Recent nuclear magnetic resonance studies of proteins in solution at ambient temperature indeed suggest that this is the case. Some of the ring groups of the tyrosyl and phenylalanine residues in lysozyme (22), bacterial ferredoxin (23), pancreatic trypsin inhibitor (24,25), horse fernicytochrome c (26), parvalbumin (27), and troponin-C (28) have been shown to rotate (22,25,26) or flip (22,26) with frequencies of 104 s-'. A second class of ring groups in these proteins is not involved in such averaging motions.…”
Section: Discussionmentioning
confidence: 99%
“…A second class of ring groups in these proteins is not involved in such averaging motions. The two classes of ring groups are attributed to differences in the thermal stability of surface and internal residues (22,23,(25)(26).…”
Section: Discussionmentioning
confidence: 99%