Ferredoxins in the evolution of photosynthetic systems from anaerobic bacteria to higher plants

Details Ferredoxins in the evolution of photosynthetic systems from anaerobic bacteria to higher plants Ferredoxins in the evolution of photosynthetic systems from anaerobic bacteria to higher plants

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973slsci...4..455h&link_type=abstract

Space Life Sciences, Volume 4, Issue 3-4, pp. 455-468

Computer Science

1

Scientific paper

Ferredoxins are present in a wide range of organisms, from the primitive anaerobic bacteria to higher plants and animals, where they function in diverse electron transfer processes. They are relatively small proteins with molecular weights of 6000 to 12000, contain 2 8 Fe atoms and an equivalent amount of inorganic sulphur per molecule, and they transfer electrons at low redox potentials. Anaerobic bacteria, like the clostridia, contain 8 Fe ferredoxins with a peptide chain of 55 amino acid residues which could be arranged in two similar halves suggesting the evolution of the molecule, from a prototype of 26 amino acid residues, by gene duplication. Since these ferredoxins contain a high predominance of certain amino acids detected in meteorites and lunar samples and synthesized under simulated prebiotic environment and since iron and sulphus could be incorporated easily into the apoprotein in anaerobic conditions, the ferredoxin molecule could have been formed in the early periods of the origin of life. From the available chemical compositions and amino acid sequences of various ferredoxins the following evolutionary scheme can be postulated: anaerobic bacteria→green photosynthetic bacteria→red photosynthetic bacteria→sulphate reducing bacteria→blue-green algae→green algae and higher plants.

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