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Chapter 27: Q30CP (page 1029)

What is the function of the RNA component of the SRP?

Short Answer

Expert verified

The RNA component of the SRP molecule interacts with the large subunit of the ribosome, and it also allows SRP to interact with its receptor.

Step by step solution

01

Signal recognition particle

The signal recognition particle, abbreviated as SRP, is a ribonucleoprotein that interacts with the ribosome to recognize the signal sequences attached to the polypeptides. It helps in the translocation of the proteins to their destination.

02

Function of RNA component of SRP

The RNA component of SRP helps in the cotranslational protein targeting. The S domain of the RNA attaches to the base of the large ribosomal subunit near the polypeptide exit channel, where SRP recognizes signal sequences.

The Alu domain of the RNA wraps around the large subunit so that it can interact with the ribosome at the interface of large and small subunits. The RNA also catalyzes SRP interaction with the SRP receptor.

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Most popular questions from this chapter

Calculate the energy required, in ATP equivalents, to synthesize a 100-residue protein from free amino acids in E. coli (assume that the N-terminal Met remains attached to the polypeptide and that no ribosomal proofreading occurs).

Under conditions of nutrient starvation, bacteria produce a protein that binds to the 3鈥� end of 16S rRNA. What is the result of this interaction and why is it bene铿乧ial to the cell?

Could a single nucleotide deletion restore the function of a protein-coding gene interrupted by the insertion of a 4-nt sequence? Explain.

Which base pairings account for wobble at the third codon-anticodon position?

Cells can make certain oligopeptides using conventional enzymes rather than mRNA-directed translation by a ribosome. Draw the product of the reaction catalyzed by L-glutamate: L-cysteine gamma-ligase

纬-glutamylcysteinesynthetase
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