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If give a segment – 5’CTGACCAUGGCCTAGAUGCCTCT, which AUG will the eukaryotic ribosome choose as initiation site?

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If give a segment – 5’CTGACCAUGGCCTAGAUGCCTCT, which AUG will the eukaryotic ribosome choose as initiation site?

(a) Any at random

(b) First

(c) Second

(d) None

I had been asked this question in an international level competition.

This key question is from Initiation in portion Gene Expression : Translation of Cytogenetics

1 Answer

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Right answer is (b) First

Explanation: The ribosome scans the mRNA from 5’ end to the 3’ end searching for a Kozak consensus sequence to start at. Here, the 1^st AUG indeed has a purin at -3 and +4 position so it is a good initiation site, the ribosome will not look beyond to the 2^nd AUG(weaker) and start initiation.

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