Interaction of MTMR6, MTMR7, and MTMR9. (A) Myc-tagged MTM
proteins were expressed in COS-7 cells. Cell lysates were mixed with
GSTMTMR7-SID-coil or GST-MTMR9-SID-coil protein beads, and a GST pull-down
assay was performed. Mock, empty pCMV5-Myc vector is transfected; G, GST; C,
coiled-coil domain. The numbers depicted under the diagrams of GST proteins
indicate the amino acid numbers of each construct. (B) MTMR6
associates with full-length MTMR9. HA-tagged MTMR6 and MTMR7 were transfected
into COS-7 cells with Myc-tagged MTMR9. HA-tagged proteins were
immunoprecipitated (IP). Immunoprecipitates were analyzed by Western blotting
with anti-Myc antibody. (C) Identification of MTMR7-binding domain of
MTMR9. Myc-tagged MTMR7 was expressed in COS-7 cells. Cell lysates were mixed
with GST-MTMR9-SID or GST-MTMR9-coil protein bound to glutathione-Sepharose 4B
beads, and a GST pull-down assay was performed.