1Z9O

1.9 Angstrom Crystal Structure of the Rat VAP-A MSP Homology Domain in Complex with the Rat ORP1 FFAT Motif

Summary for 1Z9O

• Entry DOI: 10.2210/pdb1z9o/pdb
• Related: 1Z9L
• Descriptor: Vesicle-associated membrane protein-associated protein A, Oxysterol binding protein (3 entities in total)
• Functional Keywords: vap-33, vap-a, vap-b, vap-c, vapa, vapb, vapc, vap-33a, scs2, erg30, ffat motif, er, endoplasmic reticulum, targeting, immunoglobulin-like beta sheet, msp homology domain, osbp, orp, oxysterol binding protein, protein binding-lipid binding protein complex, protein binding/lipid binding protein
• Biological source: Rattus norvegicus (Norway rat); More
• Total number of polymer chains: 12
• Total formula weight: 94326.22

Authors

Kaiser, S.E.,Brickner, J.H.,Reilein, A.R.,Fenn, T.D.,Walter, P.,Brunger, A.T. (deposition date: 2005-04-03, release date: 2005-07-19, Last modification date: 2023-08-23)

Primary citation

Kaiser, S.E.,Brickner, J.H.,Reilein, A.R.,Fenn, T.D.,Walter, P.,Brunger, A.T.
Structural basis of FFAT motif-mediated ER targeting
Structure, 13:1035-1045, 2005

PubMed Abstract: The FFAT motif is a targeting signal responsible for localizing a number of proteins to the cytosolic surface of the endoplasmic reticulum (ER) and to the nuclear membrane. FFAT motifs bind to members of the highly conserved VAP protein family, which are tethered to the cytoplasmic face of the ER by a C-terminal transmembrane domain. We have solved crystal structures of the rat VAP-A MSP homology domain alone and in complex with an FFAT motif. The co-crystal structure was used to design a VAP mutant that disrupts rat and yeast VAP-FFAT interactions in vitro. The FFAT binding-defective mutant also blocked function of the VAP homolog Scs2p in yeast. Finally, overexpression of the FFAT binding-defective VAP in COS7 cells dramatically altered ER morphology. Our data establish the structural basis of FFAT-mediated ER targeting and suggest that FFAT-targeted proteins play an important role in determining ER morphology.

PubMed: 16004875
DOI: 10.1016/j.str.2005.04.010

Experimental method

X-RAY DIFFRACTION (1.9 Å)