Intron-encoded open reading frame of the GIY-YIG subclass in a plastid gene.

Abstract:

:Group-I introns, containing open reading frames (ORFs) that code for homing endonucleases, are widely distributed amongst eukaryotic organellar genomes. However, endonucleases of the GIY-YIG subclass have a restricted distribution in mitochondria and bacteriophages, and have never been observed in plastids. We have found the GIY-YIG motif in an intronic ORF within the previously published psbA gene sequence from Chlamydomonas reinhardtii chloroplasts. Based on phylogenetic analysis and an evaluation of amino-acid substitutions, this ORF is not closely related to any of the other GIY-YIG ORFs. These results suggest that GIY-YIG ORFs have a longer evolutionary history than previously assumed.

journal_name

Curr Genet

journal_title

Current genetics

authors

Paquin B,O'Kelly CJ,Lang BF

doi

10.1007/BF00311888

subject

Has Abstract

pub_date

1995-06-01 00:00:00

pages

97-9

issue

1

eissn

0172-8083

issn

1432-0983

journal_volume

28

pub_type

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