Carbon and energy source markers for transformation of strains of the genes Pichia
First Claim
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1. The pure culture comprising Pichia pastoris NRRL y-11430/pTSUI.
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Abstract
Yeast strains are transformed with, and selected for, using DNA fragments encoding a gene function not present in the wild-type yeast strains. The invention requires transforming the yeast with DNA fragments which comprise the gene function which the wild-type yeast strain is lacking; regeneration of the transformants on a non-selective regeneration medium; then selection of those colonies which are capable of growth on a carbon and energy source which requires expression of the gene function provided by the DNA fragment. Thus, transformation with such DNA fragments allows for positive selection of transformed strains.
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3 Claims
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1. The pure culture comprising Pichia pastoris NRRL y-11430/pTSUI.
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2. The pure culture comprising Pichia pastoris y-11430/pSR11.
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3. The pure culture comprising Pichia pastoris NRRL y-15851/pSR1.
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