Organization and Structure of Plastome PsbF, PsbL, PetG and ORF712 Genes in Chlamydomonas Reinhardtii

Overview

Journal Curr Genet

Specialty Genetics

Date 1992 May 1

PMID 1617741

Citations 16

Authors

S E Fong

S J Surzycki

Affiliations

Soon will be listed here.

Abstract

We have determined the nucleotide sequence of a 5159 base-pair (bp) region of the Chlamydomonas reinhardtii plastome containing three photoelectron transport genes, psbF, psbL and petG, and an unusual open reading frame, ORF712. The photosynthetic genes have an unprecedented arrangement, psbF and psbL are located in close proximity to petG, and are not grouped with two other genes of the cytochrome b559 locus, psbE and ORF42. ORF712, located adjacent to psbL, has homology at its 5'- and 3'-ends to the ribosomal protein rps3 gene, but contains a central 437 residue domain that lacks similarity to any other known sequence. These sequences add to the growing body of evidence that the chloroplast genome of C. reinhardtii has a significantly different gene arrangement to its counterpart in plants. The structure of ORF712 also provides another example of a phenomenon we have discovered with C. reinhardtii RNA polymerase genes (Fong and Surzycki 1992); namely, that the algal plastome contains chimeric genes in which reading frames with homology to known genes are juxtaposed in-frame with long coding regions of unknown identity.

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