Journal
NATURE
Volume 521, Issue 7553, Pages 529-U257Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature14457
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Funding
- National Institutes of Health [R01GM058615, R01AI068871, R01AR065538, 1S10RR027931-01, K01DK089145]
- National Research Foundation of Korea [2014R1A6A3A03056673]
- National Research Foundation of Korea [2014R1A6A3A03056673] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The Golgi complex has a central role in the intracellular sorting of secretory proteins(1,2). Anterograde transport through the Golgi has been explained by the movement of Golgi cisternae, known as cisternal maturation(3-5). Because this explanation is now appreciated to be incomplete(6), interest has developed in understanding tubules that connect the Golgi cisternae(7-9). Here we show that the coat protein (COPI) complex sorts anterograde cargoes into these tubules in human cells. Moreover, the small GTPase CDC42 regulates bidirectional Golgi transport by targeting the dual functions of COPI in cargo sorting and carrier formation. CDC42 also directly imparts membrane curvature to promote COPI tubule formation. Our findings further reveal that COPI tubular transport complements cisternal maturation in explaining how anterograde Golgi transport is achieved, and that bidirectional COPI transport is modulated by environmental cues through CDC42.
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