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 Genetjournal_title
Current geneticsauthors
Paquin B,O'Kelly CJ,Lang BFdoi
10.1007/BF00311888subject
Has Abstractpub_date
1995-06-01 00:00:00pages
97-9issue
1eissn
0172-8083issn
1432-0983journal_volume
28pub_type
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