The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Specific kinesin and dynein molecules participate in the unconventional protein secretion of transmembrane proteins

  • Sung Ho Eun (Department of Pharmacology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine) ;
  • Shin Hye Noh (Severance Biomedical Science Institute, Yonsei University College of Medicine) ;
  • Min Goo Lee (Department of Pharmacology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine)
  • Received : 2024.01.25
  • Accepted : 2024.06.05
  • Published : 2024.09.01
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Abstract

Secretory proteins, including plasma membrane proteins, are generally known to be transported to the plasma membrane through the endoplasmic reticulum-to-Golgi pathway. However, recent studies have revealed that several plasma membrane proteins and cytosolic proteins lacking a signal peptide are released via an unconventional protein secretion (UcPS) route, bypassing the Golgi during their journey to the cell surface. For instance, transmembrane proteins such as the misfolded cystic fibrosis transmembrane conductance regulator (CFTR) protein and the Spike protein of coronaviruses have been observed to reach the cell surface through a UcPS pathway under cell stress conditions. Nevertheless, the precise mechanisms of the UcPS pathway, particularly the molecular machineries involving cytosolic motor proteins, remain largely unknown. In this study, we identified specific kinesins, namely KIF1A and KIF5A, along with cytoplasmic dynein, as critical players in the unconventional trafficking of CFTR and the SARS-CoV-2 Spike protein. Gene silencing results demonstrated that knockdown of KIF1A, KIF5A, and the KIF-associated adaptor protein SKIP, FYCO1 significantly reduced the UcPS of △F508-CFTR. Moreover, gene silencing of these motor proteins impeded the UcPS of the SARS-CoV-2 Spike protein. However, the same gene silencing did not affect the conventional Golgi-mediated cell surface trafficking of wild-type CFTR and Spike protein. These findings suggest that specific motor proteins, distinct from those involved in conventional trafficking, are implicated in the stress-induced UcPS of transmembrane proteins.

Keywords

Acknowledgement

The authors express their gratitude to individuals who contributed to this work.

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