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Published on: January 20, 2015
Phospholipase Cdelta4 associates with glutamate receptor interacting protein 1 in testis
Yasuhiro Irino1, Manabu Ichinohe, Yoshikazu Nakamura
1Laboratory of Genome and Biosignal, School of Life Science, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
Abstract:
We reported previously that phospholipase C (PLC) delta4 is required for calcium mobilization in the zona pellucida-induced acrosome reaction in sperm. Here we focused on the function of the C2 domain of PLCdelta4 and report that glutamate receptor-interacting protein1 (GRIP1) was identified as a binding protein of the PLCdelta4-C2 domain on yeast two-hybrid screening. Physiological interaction of GRIP1 with PLCdelta4 in mouse testis was confirmed by immunoprecipitation with anti-PLCdelta4 antibodies and the association seemed to correlate with the maturation stage of sperm. We also determined that a PDZ-binding motif at the C-terminus of the PLCdelta4-C2 domain is responsible for GRIP1 binding, whereas the sixth or seventh PDZ domain of GRIP1 is essential and sufficient for association with the PLCdelta4-C2 domain. These results indicate that PLCdelta4 binds via its C2 domain to the PDZ6 or PDZ7 domain of GRIP1, and that this association may play a role in spermatogenesis.
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