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| [[Image:1awd.gif|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1awd| PDB=1awd | SCENE= }} | | {{STRUCTURE_1awd| PDB=1awd | SCENE= }} |
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| '''FERREDOXIN [2FE-2S] OXIDIZED FORM FROM CHLORELLA FUSCA'''
| | ===FERREDOXIN [2FE-2S] OXIDIZED FORM FROM CHLORELLA FUSCA=== |
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| ==Overview==
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| BACKGROUND: [2Fe-2S] ferredoxins, also called plant-type ferredoxins, are low-potential redox proteins that are widely distributed in biological systems. In photosynthesis, the plant-type ferredoxins function as the central molecule for distributing electrons from the photolysis of water to a number of ferredox-independent enzymes, as well as to cyclic photophosphorylation electron transfer. This paper reports only the second structure of a [2Fe-2S] ferredoxin from a eukaryotic organism in its native form. RESULTS: Ferredoxin from the green algae Chlorella fusca has been purified, characterised, crystallised and its structure determined to 1.4 A resolution - the highest resolution structure published to date for a plant-type ferredoxin. The structure has the general features of the plant-type ferredoxins already described, with conformational differences corresponding to regions of higher mobility. Immunological data indicate that a serine residue within the protein is partially phosphorylated. A slightly electropositive shift in the measured redox potential value, -325 mV, is observed in comparison with other ferredoxins. CONCLUSIONS: This high-resolution structure provides a detailed picture of the hydrogen-bonding pattern around the [2Fe-2S] cluster of a plant-type ferredoxin; for the first time, it was possible to obtain reliable error estimates for the geometrical parameters. The presence of phosphoserine in the protein indicates a possible mechanism for the regulation of the distribution of reducing power from the photosynthetic electron-transfer chain.
| | The line below this paragraph, {{ABSTRACT_PUBMED_10545324}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 10545324 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_10545324}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Green alga]] | | [[Category: Green alga]] |
| [[Category: Metalloprotein]] | | [[Category: Metalloprotein]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:46:32 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 17:44:35 2008'' |
