RESEARCH ARTICLE TANGO1 builds a machine for collagen export by recruiting and spatially organizing COPII, tethers and membranes Ishier Raote1,2†, Maria Ortega-Bellido1,2†, Anto´ nio JM Santos1,2‡, Ombretta Foresti1,2, Chong Zhang3, Maria F Garcia-Parajo4,5, Felix Campelo4, Vivek Malhotra1,2,5* 1Centre for Genomic Regulation, The Barcelona Institute of Science and Technology, Barcelona, Spain; 2Universitat Pompeu Fabra, Barcelona, Spain; 3SIMBIOsys Group, Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain; 4ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain; 5Institucio Catalana de Recerca i Estudis Avanc¸ats, Barcelona, Spain Abstract Collagen export from the endoplasmic reticulum (ER) requires TANGO1, COPII coats, and retrograde fusion of ERGIC membranes. How do these components come together to produce a transport carrier commensurate with the bulky cargo collagen? TANGO1 is known to form a ring that corrals COPII coats, and we show here how this ring or fence is assembled. Our data reveal that a TANGO1 ring is organized by its radial interaction with COPII, and lateral interactions with *For correspondence: cTAGE5, TANGO1-short or itself. Of particular interest is the finding that TANGO1 recruits ERGIC
[email protected] membranes for collagen export via the NRZ (NBAS/RINT1/ZW10) tether complex. Therefore, †These authors contributed TANGO1 couples retrograde membrane flow to anterograde cargo transport. Without the NRZ equally to this work complex, the TANGO1 ring does not assemble, suggesting its role in nucleating or stabilising this Present address: ‡Division of process. Thus, coordinated capture of COPII coats, cTAGE5, TANGO1-short, and tethers by Hematology, Department of TANGO1 assembles a collagen export machine at the ER.