Köhler F, Storch B, Kulathu Y, Herzog S, Kuppig S, Reth M, Jumaa H. A leucine zipper in the N terminus confers membrane association to SLP-65.
Nat Immunol 2005;
6:204-10. [PMID:
15654340 DOI:
10.1038/ni1163]
[Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2004] [Accepted: 12/22/2004] [Indexed: 11/09/2022]
Abstract
Membrane recruitment of adaptor proteins is crucial for coupling antigen receptors to downstream signaling events. Despite the essential function of the B cell adaptor SLP-65, the mechanism of its recruitment to the plasma membrane is not yet understood. Here we show that a highly conserved leucine zipper in the SLP-65 N terminus is responsible for membrane association. Alterations in the N terminus abolished SLP-65 membrane localization and activity, both of which were restored by replacement of the N terminus with a myristoylation signal. The N terminus is an autonomous domain that confers specific localization and function when transferred to green fluorescent protein or the adaptor protein SLP-76. Our data elucidate the mechanism of SLP-65 membrane recruitment and suggest that leucine zipper motifs are essential interaction domains of signaling proteins.
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