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What is the full form of AOX in Pichia pastoris expression system?

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What is the full form of AOX in Pichia pastoris expression system?

(a) Artificial oxidase

(b) Acetone oxidase

(c) Alcohol oxidase

(d) Acetyl oxidase

I got this question in class test.

The question is from Guidelines for Choosing Host-Vector Systems topic in section Utilizing Genetically Engineered Organisms & Medical Applications of Bioprocess Engineering of Bioprocess Engineering

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Correct option is (c) Alcohol oxidase

The best explanation: Pichia pastoris has two alcohol oxidase genes, Aox1 and Aox2, which have a strongly inducible promoter. These genes allow Pichia to use methanol as a carbon and energy source. The AOX promoters are induced by methanol and are repressed by e.g. glucose. Usually the gene for the desired protein is introduced under the control of the AOX1 promoter, which means that protein production can be induced by the addition of methanol.

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