Tat-dependent targeting of Rieske iron-sulphur proteins to both the plasma and thylakoid membranes in the cyanobacterium Synechocystis PCC6803

Aldridge, Cassie and Spence, Edward and Kirkilionis, Markus A. and Frigerio, Lorenzo and Robinson, Colin (2008) Tat-dependent targeting of Rieske iron-sulphur proteins to both the plasma and thylakoid membranes in the cyanobacterium Synechocystis PCC6803. Molecular Microbiology, 70 (1). pp. 140-150. ISSN 0950382X. (doi:https://doi.org/10.1111/j.1365-2958.2008.06401.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1111/j.1365-2958.2008.06401.x

Abstract

Cyanobacteria possess a differentiated membrane system and transport proteins into both the periplasm and thylakoid lumen. We have used green fluorescent protein (GFP)-tagged constructs to study the Tat protein transporter and Rieske Tat substrates in Synechocystis PCC6803. The Tat system has been shown to operate in the plasma membrane; we show here that it is also relatively abundant in the thylakoid membrane network, indicating that newly synthesized Tat substrates are targeted to both membrane systems. Synechocystis contains three Rieske iron-sulphur proteins, all of which contain typical twin-arginine signal-like sequences at their N-termini. We show that two of these proteins (PetC1 and PetC2) are obligate Tat substrates when expressed in Escherichia coli. The Rieske proteins exhibit differential localization in Synechocystis 6803; PetC1 and PetC2 are located in the thylakoid membrane, while PetC3 is primarily targeted to the plasma membrane. The combined data show that Tat substrates are directed with high precision to both membrane systems in this cyanobacterium, raising the question of how, and when, intracellular sorting to the correct membrane is achieved.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculties > Sciences > School of Biosciences
Depositing User: Colin Robinson
Date Deposited: 24 Jul 2013 15:49 UTC
Last Modified: 28 Aug 2013 08:31 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/34855 (The current URI for this page, for reference purposes)
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