NEET · BiologyHard
During the process of protein translocation into the endoplasmic reticulum, the signal recognition particle (SRP) binds to the signal sequence. What is the primary function of the SRP receptor in this mechanism?
- A.It hydrolyzes GTP to provide energy for the translocation pore opening
- B.It acts as a docking site for the SRP-ribosome complex and facilitates the release of SRP
- C.It directly phosphorylates the nascent polypeptide chain to initiate folding
- D.It serves as the primary translocon channel for the polypeptide chain
Show correct answer & step-by-step solution
Correct answer: B — It acts as a docking site for the SRP-ribosome complex and facilitates the release of SRP
Solution
- The SRP binds to the signal sequence of the nascent polypeptide chain.
- The SRP-ribosome complex moves to the ER membrane.
- The SRP receptor binds the SRP-ribosome complex.
- GTP hydrolysis by both SRP and the receptor leads to the release of SRP and the transfer of the ribosome to the translocon.
- Hence the answer is (B).
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