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Golgi protein FAPP2 tubulates membranes.

ABSTRACT: The Golgi-associated four-phosphate adaptor protein 2 (FAPP2) has been shown to possess transfer activity for glucosylceramide both in vitro and in cells. We have previously shown that FAPP2 is involved in apical transport from the Golgi complex in epithelial MDCK cells. In this paper we assign an unknown activity for the protein as well as providing structural insight into protein assembly and a low-resolution envelope structure. By applying analytical ultracentrifugation and small-angle x-ray scattering, we show that FAPP2 is a dimeric protein in solution, having a curved shape 30 nm in length. The purified FAPP2 protein has the capability to form tubules from membrane sheets in vitro. This activity is dependent on the phosphoinositide-binding activity of the PH domain of FAPP2. These data suggest that FAPP2 functions directly in the formation of apical carriers in the trans-Golgi network.

SUBMITTER: Cao X

PROVIDER: S-EPMC2795549 | biostudies-literature | 2009 Dec

REPOSITORIES: biostudies-literature

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Golgi protein FAPP2 tubulates membranes.

Cao Xinwang X Coskun Unal U Rössle Manfred M Buschhorn Sabine B SB Grzybek Michal M Dafforn Timothy R TR Lenoir Marc M Overduin Michael M Simons Kai K

Proceedings of the National Academy of Sciences of the United States of America 20091125 50

The Golgi-associated four-phosphate adaptor protein 2 (FAPP2) has been shown to possess transfer activity for glucosylceramide both in vitro and in cells. We have previously shown that FAPP2 is involved in apical transport from the Golgi complex in epithelial MDCK cells. In this paper we assign an unknown activity for the protein as well as providing structural insight into protein assembly and a low-resolution envelope structure. By applying analytical ultracentrifugation and small-angle x-ray ...[more]

PMID: 19940249

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