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In recombinase the activated ______________ residue performs the catalytic attack.

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In recombinase the activated ______________ residue performs the catalytic attack.

(a) Serine

(b) Threonine

(c) Tyrosine

(d) Cystine

The question was posed to me in unit test.

The query is from Site-Specific Recombination topic in chapter Genetic Recombination of Cytogenetics

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Correct answer is (b) Threonine

Explanation: The activated threonine residues of one pair opposite recombinase molecules first attack creating the Holliday intermediate. Then the other opposite threonine pair resolves it.

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