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Requirements of Slm proteins for proper eisosome organization, endocytic trafficking and recycling in the yeast Saccharomyces cerevisiae

Abstract

Eisosomes are large immobile assemblies at the cortex of a cell under the membrane compartment of Can1 (MCC) in yeast. Slm1 has recently been identified as an MCC component that acts downstream of Mss4 in a pathway that regulates actin cytoskeleton organization in response to stress. In this study, we showed that inactivation of Slm proteins disrupts proper localization of the primary eisosome marker Pil1, providing evidence that Slm proteins play a role in eisosome organization. Furthermore, we found that slm ts mutant cells exhibit actin defects in both the ability to polarize cortical F-actin and the formation of cytoplasmic actin cables even at the permissive temperature (30°C). We further demonstrated that the actin defect accounts for the slow traffic of FM4-64-labelled endosome in the cytoplasm, supporting the notion that intact actin is essential for endosome trafficking. However, our real-time microscopic analysis of Abp1-RFP revealed that the actin defect in slm ts cells was not accompanied by a noticeable defect in actin patch internalization during receptor-mediated endocytosis. In addition, we found that slm ts cells displayed impaired membrane recycling and that recycling occurred in an actin-independent manner. Our data provide evidence for the requirement of Slm proteins in eisosome organization and endosome trafficking and recycling.

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Abbreviations

FITC:

fluorescein isothiocyanate

LCB:

long-chain bases

LY:

Lucifer yellow

MCC:

membrane compartment of Can1

MCP:

membrane compartment of Pma1

NA:

numerical aperture

PH:

pleckstrin homology

RME:

receptor-mediated endocytosis

YPD:

yeast peptone dextrose

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Acknowledgements

We are grateful to Scott Emr for providing slm ts mutant strains and Mark Longtine for providing the PCR templates. We thank Paul Durham and Mark Richter for providing unrestricted access to laboratories and equipment. This work was supported by a National Scientific Foundation Grant 0923024 (to KK) and by thesis funding from Missouri State University (to CK).

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Correspondence to Kyoungtae Kim.

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[Kamble C, Jain S, Murphy E and Kim K 2011 Requirements of Slm proteins for proper eisosome organization, endocytic trafficking and recycling in the yeast Saccharomyces cerevisiae. J. Biosci. 36 XXX–XXX] DOI

Chitra Kamble and Sandhya Jain have contributed equally to this work.

ePublication: 00 January 2011

Corresponding editor: Durgadas P Kasbekar

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Kamble, C., Jain, S., Murphy, E. et al. Requirements of Slm proteins for proper eisosome organization, endocytic trafficking and recycling in the yeast Saccharomyces cerevisiae . J Biosci 36, 79–96 (2011). https://doi.org/10.1007/s12038-011-9018-0

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Keywords

  • Actin
  • Actin patch
  • Eisosome
  • Endocytosis
  • Endosome
  • FM4-64
  • Pil1
  • Recycling
  • Slm1/2
  • Trafficking