Ferredoxins in Developing Spinach Cotyledons : The Presence of Two Molecular Species :

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An antibody for ferredoxin was used to investigate the development of ferredoxin during the greening of spinach cotyledons. Ferredoxin was present in 8-day-old etiolated cotyledons and increased with illumination, which means that the synthesis of ferredoxin was both light dependent and independent. The ferredoxin purified from etiolated cotyledons, greening cotyledons, and mature leaves was a mixture of two chemically distinct molecular species; ferredoxin I and II. The relative contents of these two species varied with the stage of development and the conditions used. Ferredoxin I was identical with that isolated previously as validated by its amino acid sequence [Matsubara and Sasaki (1968) J. Biol. Chem. 243: 1732]. The complete amino acid sequence of the second component, ferredoxin II, was determined as well. It was composed of 97 amino acid residues and differed from ferredoxin I by 25 residues.

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