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The number of the C-terminal transmembrane domains has the potency to specify subcellular localization of Sec22c.

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      Abstract

      Sec22c has been characterized as an endoplasmic reticulum (ER)-localized transmembrane protein involved in regulation of the vesicle transport between the ER and the Golgi. Sec22c has several isoforms generated by alternative splicing that changes the number of the C-terminal transmembrane domains (TMDs). However, the physiological significance of the splicing remains unknown. Here we show that the splicing isoforms containing four TMDs unexpectedly localized at cis-Golgi, whereas the splicing isoforms containing less than four TMDs localized at the ER. The C-terminal fragment containing the four TMDs was sufficient for the cis-Golgi localization and bound to ADP-ribosylation factor 4 (ARF4). ARF4 knockdown and overexpression of a constitutively active mutant of ARF4 decreased the cis-Golgi localization of the C-terminal fragment and the full-length protein, respectively. These results indicate that the splicing-dependent changes in the number of TMDs allow Sec22c to regulate the subcellular localization in cooperation with ARF4, implying that Sec22c will function at the Golgi as well as the ER.

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      Affiliations
      [1 ] Division of Membrane Dynamics, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan.
      [2 ] Division of Membrane Dynamics, Department of Physiology and Cell Biology, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan. Electronic address: sakisaka@med.kobe-u.ac.jp.
      Journal
      Biochem. Biophys. Res. Commun.
      Biochemical and biophysical research communications
      Elsevier BV
      1090-2104
      0006-291X
      May 27 2017
      : 487
      : 2
      28414125
      S0006-291X(17)30738-6
      10.1016/j.bbrc.2017.04.071

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