Abstract
Mutations in LMAN1 (also called ERGIC-53) result in combined deficiency of factor V and factor VIII (F5F8D), an autosomal recessive bleeding disorder characterized by coordinate reduction of both clotting proteins1. LMAN1 is a mannose-binding type 1 transmembrane protein localized to the endoplasmic reticulum–Golgi intermediate compartment (ERGIC; refs. 2,3), suggesting that F5F8D could result from a defect in secretion of factor V and factor VIII (ref. 4). Correctly folded proteins destined for secretion are packaged in the ER into COPII-coated vesicles5, which subsequently fuse to form the ERGIC. Secretion of certain abundant proteins suggests a default pathway requiring no export signals (bulk flow; refs. 6,7). An alternative mechanism involves selective packaging of secreted proteins with the help of specific cargo receptors8,9,10,11,12,13. The latter model would be consistent with mutations in LMAN1 causing a selective block to export of factor V and factor VIII. But ∼30% of individuals with F5F8D have normal levels of LMAN1, suggesting that mutations in another gene may also be associated with F5F8D14,15. Here we show that inactivating mutations in MCFD2 cause F5F8D with a phenotype indistinguishable from that caused by mutations in LMAN1. MCFD2 is localized to the ERGIC through a direct, calcium-dependent interaction with LMAN1. These findings suggest that the MCFD2-LMAN1 complex forms a specific cargo receptor for the ER-to-Golgi transport of selected proteins.
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Acknowledgements
We thank E. Smith for assistance in generating monoclonal antibodies, L. Chang and J. Liu for assistance with the confocal microscope and S.J. Weiss and A. Saltiel for comments on the manuscript. This work was supported in part by grants from the US National Institutes of Health to D.G., W.C.N. and R.J.K. B.Z. is a Judith Graham Pools Postgraduate Fellow of the National Hemophilia Foundation. M.A.C is the recipient of a research fellowship from the Heart and Stroke Foundation of Canada. D.G. and R.J.K. are investigators of the Howard Hughes Medical Institute.
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Zhang, B., Cunningham, M., Nichols, W. et al. Bleeding due to disruption of a cargo-specific ER-to-Golgi transport complex. Nat Genet 34, 220–225 (2003). https://doi.org/10.1038/ng1153
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DOI: https://doi.org/10.1038/ng1153
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