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  • Title: Molecular cloning and sequencing of the psaD gene encoding subunit II of photosystem I from the cyanobacterium, Synechocystis sp. PCC 6803.
    Author: Reilly P, Hulmes JD, Pan YC, Nelson N.
    Journal: J Biol Chem; 1988 Nov 25; 263(33):17658-62. PubMed ID: 3141423.
    Abstract:
    Photosystem I reaction center was isolated from the cyanobacterium, Synechocystis sp. PCC 6803, in a form which contains seven different polypeptide subunits. One of the subunits, with a molecular mass of about 16 kDa, was isolated, and protein sequence information was obtained for the amino terminus and several tryptic peptides. Oligonucleotide probes, corresponding to these sequences, were used to probe a genomic library, and the gene, designated psaD, encoding subunit II was cloned and sequenced. The gene encodes a polypeptide with a mass 15,644 Da, which exhibits a high degree of similarity to subunit II from tomato, as well as amino acid sequences reported from barley photosystem I. In addition to this gene, three large open reading frames were identified. Two remain unidentified, and the third is highly homologous to anthranilate synthase, component 1 from Escherichia coli and Saccharomyces cerevisiae.
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