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Reference.org
Rubredoxin
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<p>Rubredoxins are a class of low-molecular-weight <a href="/facts/Iron/QK1JYy8E">iron</a>-containing proteins found in sulfur-metabolizing <a href="/facts/Bacteria/wC8xSCsU">bacteria</a> and <a href="/facts/Archaea/Adxh0aHw">archaea</a>. Sometimes rubredoxins are classified as <a href="/facts/Iron-sulfur_protein/mYwTWzRH">iron-sulfur proteins</a>; however, in contrast to iron-sulfur proteins, rubredoxins do not contain inorganic sulfide. Like <a href="/facts/Cytochrome/VF51IeGv">cytochromes</a>, <a href="/facts/Ferredoxin/1qJJjQHk">ferredoxins</a> and <a href="/facts/Rieske_protein/l8R6wqd5">Rieske proteins</a>, rubredoxins are thought to participate in <a href="/facts/Electron_transfer/BIdASS9R">electron transfer</a> in biological systems. Recent work in bacteria and algae have led to the hypothesis that some rubredoxins may instead have a role in delivering iron to <a href="/facts/Metalloproteins/c0cXhyG4">metalloproteins</a>. </p>