Premium
A factor related to pseudouridine synthases is required for chloroplast group II intron trans ‐splicing in Chlamydomonas reinhardtii
Author(s) -
Perron Karl,
GoldschmidtClermont Michel,
Rochaix JeanDavid
Publication year - 1999
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/18.22.6481
Subject(s) - biology , chlamydomonas reinhardtii , pseudouridine , intron , rna splicing , group ii intron , rna , gene , genetics , biochemistry , transfer rna , mutant
In Chlamydomonas reinhardtii , the psaA mRNA is assembled by a process involving two steps of trans ‐splicing that remove two group II introns and give rise to the mature mRNA. The products of at least 14 nuclear genes and one chloroplast gene ( tscA ) are necessary for this process. We have cloned Maa2 , one of the nuclear genes involved in trans ‐splicing of the second intron. Maa2 encodes a protein with similarity to conserved domains of pseudouridine synthases, but mutagenesis of putative catalytic residues showed that this activity may not be required for trans ‐splicing of psaA RNA. Although it is not clear whether the pseudouridine synthase activity has been maintained in Maa2, it is possible that this enzyme was recruited during evolution as an RNA chaperone for folding or stabilizing the psaA intron. The Maa2 protein appears to be associated through ionic interactions with a low density membrane system in the chloroplast that also contains RNA‐binding proteins involved in translation.