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A Toc75‐like protein import channel is abundant in chloroplasts
Author(s) -
Eckart Kerstin,
Eichacker Lutz,
Sohrt Karen,
Schleiff Enrico,
Heins Lisa,
Soll Jürgen
Publication year - 2002
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1093/embo-reports/kvf110
Subject(s) - translocon , chloroplast , chloroplast membrane , biology , envelope (radar) , microbiology and biotechnology , biophysics , membrane protein , chemistry , biochemistry , membrane , gene , thylakoid , telecommunications , radar , computer science
Chloroplasts import post‐translationally most of their constituent polypeptides via two distinct translocon units located in the outer and inner envelope. The protein import channel of the translocon of the outer envelope of chloroplasts, Toc75, is the most abundant protein in that membrane. We identify a novel Toc75 homologous protein, atToc75‐V, a prominent protein that is clearly localized in the chloroplastic outer envelope. Phylogenetic analysis indicates that Toc75‐V is more closely related to its prokaryotic ancestors than to Toc75 from plants. The presence of a second translocation channel suggests that alternative, previously unrecognized import routes into chloroplasts might exist.