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Which of the following is the proper sequence of assembly of factors on the branch poinr A?

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Which of the following is the proper sequence of assembly of factors on the branch poinr A?

(a) U1-> U2-> U6

(b) U2AF -> U2->BBP

(c) BBP->U2AF->U2

(d) BBP->U1->U2

I had been asked this question in a job interview.

My question is taken from Post-Transcriptional Modification in chapter Gene Expression : Transcription Prokaryotes of Cytogenetics

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The correct answer is (c) BBP->U2AF->U2

The explanation is: BBP stands for branch point binding proteins. In the branch site A 1st the U2AF binds followed by BBP then it is replaced by U2. Then U2 can interact with U6 that replaced U1.

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