Journal
PLANT SIGNALING & BEHAVIOR
Volume 6, Issue 7, Pages 1046-1048Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.6.7.15631
Keywords
Arabidopsis; chloroplast protein import; plastids; protein targeting; Tic20
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Funding
- BBSRC [BB/D016541/1, BB/F020325/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/D016541/1, BB/F020325/1, BBS/B/03629, C18638] Funding Source: Medline
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Tic20 is a polytopic protein of the inner envelope membrane of chloroplasts, and it is proposed to act as a translocation channel during chloroplast protein import. By analyzing 29 sequences from diverse organisms, it was evident that Tic20-related proteins form two distinct clades, termed Group 1 and Group 2. The former group includes canonical Tic20 proteins that are essential for chloroplast development, while members of the latter are of unknown function. An increased evolutionary rate, in connection with adaptation to terrestrial life, was detected in Group 1. Interestingly, the sub-cellular (genomic) localization of genes coding for Group 1 proteins differs between evolutionary lineages.
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