RRC ID 39588
Author Kuroda TS, Fukuda M, Ariga H, Mikoshiba K.
Title The Slp homology domain of synaptotagmin-like proteins 1-4 and Slac2 functions as a novel Rab27A binding domain.
Journal J Biol Chem
Abstract rab27A, which encodes a small GTP-binding protein, was recently identified as a gene in which mutations caused human hemophagocytic syndrome (Griscelli syndrome) and ashen mice, which exhibit defects in melanosome transport as well as in regulated granule exocytosis in cytotoxic T lymphocytes. However, little is known about the molecular mechanism of Rab27A-dependent membrane trafficking or the specific effector molecules of Rab27A. In this study, we discovered that the Slp (synaptotagmin-like protein) homology domain (SHD) of Slp1--3 and Slac2-a/b specifically and directly binds the GTP-bound form of Rab27A both in vitro and in intact cells but not of the other Rabs tested (Rab1, Rab2, Rab3A, Rab4, Rab5A, Rab6A, Rab7, Rab8, Rab9, Rab10, Rab11A, Rab17, Rab18, Rab20, Rab22, Rab23, Rab25, Rab28, and Rab37). Immunocytochemical analysis revealed that Slp2 (or Slp1) colocalized with Rab27A in the melanosomes of melanoma cells. Slp2 and Rab27A were distributed to the periphery of the cells (especially at the dendritic tips) in the wild-type melanoma cells, whereas they accumulated in the perinuclear region in the melanosome transport-defective cells (S91/Cloudman). These results strongly indicated that the SHD of Slp1--3 and Slac2 functions as an in vivo Rab27A binding domain.
Volume 277(11)
Pages 9212-8
Published 2002-3-15
DOI 10.1074/jbc.M112414200
PII M112414200
PMID 11773082
MeSH Amino Acid Sequence Animals Binding Sites Biological Transport Carrier Proteins / metabolism* Guanosine Triphosphate / metabolism Melanosomes / physiology Membrane Proteins / analysis Membrane Proteins / chemistry* Membrane Proteins / metabolism Mice Molecular Sequence Data Rabbits rab GTP-Binding Proteins* rab27 GTP-Binding Proteins
IF 4.238
Times Cited 163
DNA material Slac2-a (RDB03422) Rab27A (RDB03423) pEF-FLAG-mouse Rab8A (RDB14271) pEF-FLAG-mouse Rab10 (RDB14272) pEF-BOS FLAG-mouse Rab2A (RDB14675) pEF-BOS FLAG-mouse Rab5A (RDB14677) pEF-BOS FLAG-mouse Rab7 (RDB14678).