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. 1984 Dec 1;3(12):2753–2762. doi: 10.1002/j.1460-2075.1984.tb02206.x

Chlamydomonas reinhardii gene for the 32 000 mol. wt. protein of photosystem II contains four large introns and is located entirely within the chloroplast inverted repeat

Jeanne M Erickson 1,2, Michèle Rahire 1,2, Jean-David Rochaix 1,2
PMCID: PMC557763  PMID: 16453578

Abstract

The chloroplast psbA gene from the green unicellular alga Chlamydomonas reinhardii has been localized, cloned and sequenced. This gene codes for the rapidly-labeled 32-kd protein of photosystem II, also identified as as herbicide-binding protein. Unlike psbA in higher plants which is found in the large single copy region of the chloroplast genome and is uninterrupted, psbA in C. reinhardii is located entirely within the inverted repeat, hence present in two identical copies per circular chloroplast genome, and contains four large introns. These introns range from 1.1 to 1.8 kb in size and fall into the category of Group I introns. Two of the introns contain open reading frames which are in-frame with the preceding exon sequences. We present the nucleotide sequence for the C. reinhardii psbA 5'-and 3' -flanking sequences, the coding region contained in five exons and the deduced amino acid sequence. The algal gene codes for a protein of 352 amino acid residues which is 95% homologous, excluding the last eight amino acid residues, with the higher plant protein.

Keywords: group I introns, herbicide resistance, nucleotide sequence, photosynthesis, RNA maturases

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