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Functional characterization of recombinant chloroplast signal recognition particle

Functional characterization of recombinant chloroplast signal recognition particle
Functional characterization of recombinant chloroplast signal recognition particle

The signal recognition particle (SRP) is a ubiquitous system for the targeting of membrane and secreted proteins. The chloroplast SRP (cpSRP) is unique among SRPs in that it possesses no RNA and is functional in post-translational as well as co-translational targeting. We have expressed and purified the two components of the Arabidopsis thaliana chloroplast signal recognition particle (cpSRP) involved in post-translational transport: cpSRP54 and the chloroplast-specific protein, cpSRP43. Recombinant cpSRP supports the efficient in vitro insertion of pea preLhcb1 into isolated thylakoid membranes. Recombinant cpSRP is a stable heterodimer with a molecular mass of ∼100 kDa as determined by analytical ultracentrifugation, gel filtration analysis, and dynamic light scattering. The interactions of the components of the recombinant heterodimer and pea preLhcb1 were probed using an immobilized peptide library (pepscan) approach. These data confirm two previously reported interactions with the L18 region and the third transmembrane helix of Lhcb1 and suggest that the interface of the cpSRP43 and cpSRP54 proteins is involved in substrate binding. Additionally, cpSRP components are shown to recognize peptides from the cleavable, N-terminal chloroplast transit peptide of preLhcb1. The interaction of cpSRP43 with cpSRP54 was probed in a similar experiment with a peptide library representing cpSPR54. The C terminus of cpSRP54 is essential for the formation of the stable cpSRP complex and cpSPR43 interacts with distinct regions of the M domain of cpSRP54.

0021-9258
27778-27786
Groves, Matthew R.
6b481923-179f-4762-80d9-5fa20ef1a501
Mant, Alexandra
63319e45-deeb-45ad-a30d-e05b42052a0d
Kuhn, Andreas
5d41b9d7-4018-4f15-93c0-93dbb219f787
Koch, Joachim
841a954e-0c76-4dd7-9559-3a4f832b62e2
Dübel, Stefan
073d779d-290e-4f2d-b63a-d066086d3bd8
Robinson, Colin
678e0157-d628-44e8-83de-3591b07c673f
Sinning, Irmgard
fbc3f199-8a3b-47a6-9ee7-00bfc472e079
Groves, Matthew R.
6b481923-179f-4762-80d9-5fa20ef1a501
Mant, Alexandra
63319e45-deeb-45ad-a30d-e05b42052a0d
Kuhn, Andreas
5d41b9d7-4018-4f15-93c0-93dbb219f787
Koch, Joachim
841a954e-0c76-4dd7-9559-3a4f832b62e2
Dübel, Stefan
073d779d-290e-4f2d-b63a-d066086d3bd8
Robinson, Colin
678e0157-d628-44e8-83de-3591b07c673f
Sinning, Irmgard
fbc3f199-8a3b-47a6-9ee7-00bfc472e079

Groves, Matthew R., Mant, Alexandra, Kuhn, Andreas, Koch, Joachim, Dübel, Stefan, Robinson, Colin and Sinning, Irmgard (2001) Functional characterization of recombinant chloroplast signal recognition particle. The Journal of Biological Chemistry, 276 (30), 27778-27786. (doi:10.1074/jbc.M103470200).

Record type: Article

Abstract

The signal recognition particle (SRP) is a ubiquitous system for the targeting of membrane and secreted proteins. The chloroplast SRP (cpSRP) is unique among SRPs in that it possesses no RNA and is functional in post-translational as well as co-translational targeting. We have expressed and purified the two components of the Arabidopsis thaliana chloroplast signal recognition particle (cpSRP) involved in post-translational transport: cpSRP54 and the chloroplast-specific protein, cpSRP43. Recombinant cpSRP supports the efficient in vitro insertion of pea preLhcb1 into isolated thylakoid membranes. Recombinant cpSRP is a stable heterodimer with a molecular mass of ∼100 kDa as determined by analytical ultracentrifugation, gel filtration analysis, and dynamic light scattering. The interactions of the components of the recombinant heterodimer and pea preLhcb1 were probed using an immobilized peptide library (pepscan) approach. These data confirm two previously reported interactions with the L18 region and the third transmembrane helix of Lhcb1 and suggest that the interface of the cpSRP43 and cpSRP54 proteins is involved in substrate binding. Additionally, cpSRP components are shown to recognize peptides from the cleavable, N-terminal chloroplast transit peptide of preLhcb1. The interaction of cpSRP43 with cpSRP54 was probed in a similar experiment with a peptide library representing cpSPR54. The C terminus of cpSRP54 is essential for the formation of the stable cpSRP complex and cpSPR43 interacts with distinct regions of the M domain of cpSRP54.

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Published date: 27 July 2001

Identifiers

Local EPrints ID: 413712
URI: http://eprints.soton.ac.uk/id/eprint/413712
ISSN: 0021-9258
PURE UUID: b5943080-c1f2-410f-950a-e03ad796014c
ORCID for Alexandra Mant: ORCID iD orcid.org/0000-0001-7169-209X

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Date deposited: 31 Aug 2017 16:32
Last modified: 16 Mar 2024 03:40

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Contributors

Author: Matthew R. Groves
Author: Alexandra Mant ORCID iD
Author: Andreas Kuhn
Author: Joachim Koch
Author: Stefan Dübel
Author: Colin Robinson
Author: Irmgard Sinning

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