Stengel, Katharina F., Holdermann, Iris, Cain, Peter, Robinson, Colin, Wild, Klemens and Sinning, Irmgard. (2008) Structural basis for specific substrate recognition by the chloroplast signal recognition particle protein cpSRP43. Science, Vol.321 (No.5886). pp. 253-256. ISSN 0036-8075

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Abstract

Secretory and membrane proteins carry amino- terminal signal sequences that, in cotranslational targeting, are recognized by the signal recognition particle protein SRP54 without sequence specificity. The most abundant membrane proteins on Earth are the light- harvesting chlorophyll a/ b binding proteins ( LHCPs). They are synthesized in the cytoplasm, imported into the chloroplast, and posttranslationally targeted to the thylakoid membrane by cpSRP, a heterodimer formed by cpSRP54 and cpSRP43. We present the 1.5 angstrom crystal structure of cpSRP43 characterized by a unique arrangement of chromodomains and ankyrin repeats. The overall shape and charge distribution of cpSRP43 resembles the SRP RNA, which is absent in chloroplasts. The complex with the internal signal sequence of LHCPs reveals that cpSRP43 specifically recognizes a DPLG peptide motif. We describe how cpSPR43 adapts the universally conserved SRP system to posttranslational targeting and insertion of the LHCP family of membrane proteins.

Item Type:	Journal Article
Subjects:	Q Science
Divisions:	Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)
Journal or Publication Title:	Science
Publisher:	American Association for the Advancement of Science
ISSN:	0036-8075
Date:	11 July 2008
Volume:	Vol.321
Number:	No.5886
Number of Pages:	4
Page Range:	pp. 253-256
Identification Number:	10.1126/science.1158640
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/29779

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