期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 275, 期 12, 页码 8556-8563出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.275.12.8556
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资金
- NHLBI NIH HHS [R01 HL23306] Funding Source: Medline
- NIDDK NIH HHS [T32-DK07169] Funding Source: Medline
Although most L-type calcium channel alpha(1C) subunits isolated from heart or brain are similar to 190-kDa proteins that lack similar to 50 kDa of the C terminus, the C-terminal domain is present in intact cells. To test the hypothesis that the C terminus is processed but remains functionally associated with the channels, expressed, full-length alpha(1C) subunits mere cleaved in vitro by chymotrypsin to generate a 190-kDa C-terminal truncated protein and C-terminal fragments of 30-56 kDa, These hydrophilic C-terminal fragments remained membrane-associated, A C-terminal proline-rich domain (PRD) was identified as the mediator of membrane association. The alpha(1C) PRD bound to SH3 domains in Src, Lyn, Hck, and the channel beta(2) subunit. Mutant alpha(1C) Subunits lacking either similar to 50 kDa of the C terminus or the PRD produced increased barium currents through the channels, demonstrating that these domains participate in the previously described (Wei, X., Neely, a., Lacerda, A. E, Olcese, r,, Stefani, E,, Perez-Reges, E., and Birnbaumer, L,, (1994) J. Biol. Chem. 269, 1635-1640) inhibition of channel function by the C terminus.
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