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Molecular and Cellular Biology, May 2001, p. 3105-3117, Vol. 21, No. 9
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.9.3105-3117.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Skp1p and the F-Box Protein Rcy1p Form a Non-SCF Complex Involved in Recycling of the SNARE Snc1p in Yeast

Jean-Marc Galan,1 Andreas Wiederkehr,2 Jae Hong Seol,3 Rosine Haguenauer-Tsapis,4 Raymond J. Deshaies,3 Howard Riezman,2 and Matthias Peter1,*

Swiss Institute for Experimental Cancer Research, 1066 Epalinges/VD,1 and Biozentrum of the University of Basel, CH-4056 Basel,2 Switzerland; Division of Biology, California Institute of Technology, Pasadena, California 911253; and Institut Jacques Monod-CNRS, 75251 Paris Cedex 05, France4

Received 31 October 2000/Returned for modification 15 December 2000/Accepted 1 February 2001

Skp1p-cullin-F-box protein (SCF) complexes are ubiquitin-ligases composed of a core complex including Skp1p, Cdc53p, Hrt1p, the E2 enzyme Cdc34p, and one of multiple F-box proteins which are thought to provide substrate specificity to the complex. Here we show that the F-box protein Rcy1p is required for recycling of the v-SNARE Snc1p in Saccharomyces cerevisiae. Rcy1p localized to areas of polarized growth, and this polarized localization required its CAAX box and an intact actin cytoskeleton. Rcy1p interacted with Skp1p in vivo in an F-box-dependent manner, and both deletion of its F box and loss of Skp1p function impaired recycling. In contrast, cells deficient in Cdc53p, Hrt1p, or Cdc34p did not exhibit recycling defects. Unlike the case for F-box proteins that are known to participate in SCF complexes, degradation of Rcy1p required neither its F box nor functional 26S proteasomes or other SCF core subunits. Importantly, Skp1p was the only major partner that copurified with Rcy1p. Our results thus suggest that a complex composed of Rcy1p and Skp1p but not other SCF components may play a direct role in recycling of internalized proteins.

* Corresponding author. Mailing address: Swiss Institute for Experimental Cancer Research (ISREC), Ch. des Boveresses 155, 1066 Epalinges/VD, Switzerland. Phone: (41) 21 692 5884. Fax: (41) 21 652 6933. E-mail: matthias.peter{at}isrec.unil.ch.

Molecular and Cellular Biology, May 2001, p. 3105-3117, Vol. 21, No. 9
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.9.3105-3117.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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