Protein synthesis 2 prokaryotes Flashcards Preview

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Flashcards in Protein synthesis 2 prokaryotes Deck (5)
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1

What is the tRNA that always incorporates in the first methionine?

tRNA^fmet

2

What is the Shine-Dalgarno sequence in ?

A purine rich sequence 10 nucleotides upstream from the official start codon: used by ribosome to determine the start codon.

3

What is the role of IF3?

It recognizes the 30s portion of the ribosome, preventing the 30s from binding to the 50s portion of the ribosome, and causes the 30s to bind to mRNA.

4

What is the role of IF2?

binds a GTP and tRNA^fmet, allowing the tRNA^fmet to position itself on the P site of the ribosome.

5

What occurs when the 50s portion of the ribosome joins the 30s bound to the mRNA ?

The GTP attached to the first tRNA is hydrolyzed. Then IF1 and 3 are released