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EMBO reports 3, 6, 557–562 (2002)
doi:10.1093/embo-reports/kvf110
Published online: June 2002
A Toc75-like protein import channel is abundant in chloroplasts
Kerstin Eckart1, 3, Lutz Eichacker1, Karen Sohrt1, 2, 3, Enrico Schleiff1, Lisa Heins1 & Jürgen Soll1
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1 Department für Biologie I, Menzinger Stra e 67, Ludwig-Maximilians-Universität, D-80638 München, Germany
2 Present address: Strathmann AG, Sellhopsweg 1, D-22459 Hamburg, Germany
3 K. Eckart and K. Sohrt contributed equally to this work
To whom correspondence should be addressed
Jürgen Soll Tel: +49 89 17861 245; Fax: +49 89 17861 185; soll@botanik.biologie.uni-muenchen.de
Received 11 February 2002; Accepted 4 April 2002.
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Abstract
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.
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