GTP-binding proteins act as _______________: they are in their active conformation when GTP is bound, but they can hydrolyze this GTP to GDP, which releases a phosphate and flips the protein to an inactive conformation.
举一反三
- During G protein signaling, the signaling cascade begins when _______. A: a phosphate is added to GTP B: GTP replaces GDP C: a phosphate is removed from GTP D: GDP replaces GTP
- Each protein normally folds into a single stable conformation. This conformation, however, often changes dramastically when the protein interacts with other molecules in the cell.
- 三聚体GTP结合调节蛋白(trimeric GTP-binding regulatory protein)简称G蛋白,位于质膜胞质侧,由α、β、γ三个亚基组成。3个亚基中哪个亚基与GTP或GDP结合?( )。 A: α B: β C: γ
- Many proteins can be grouped into protein families, in which each family member has an amino acid sequence and a three-dimensional conformation that closely ________ those of the other family members.
- 三聚体GTP结合调节蛋白（trimeric GTP-binding regulatory protein）简称G蛋白，位于质膜胞质侧，由α、β、γ三个亚基组成。3个亚基中那个亚基与GTP或GDP结合？ A: α B: β C: γ D: δ