ADAPTATION AND PROCESS OPTIMIZATION OF MICROORGANISMS FOR GROWTH IN HEMICELLULOSIC DERIVED CARBOHYDRATES

Abstract

Provided herein are methods of making microorganisms modified for increased xylose consumption as compared to unmodified microorganisms. The methods include providing xylose-consuming microorganisms comprising two or more copies of a nucleic acid sequence encoding xylose isomerase and two or more copies of a nucleic acid sequence encoding a xylose kinase, culturing the microorganisms in medium containing xylose and harvesting a portion of the microorganisms. These steps are repeated multiple times. The microorganisms are then isolated. The isolated microorganisms have increased xylose consumption rates compared to control xylose-consuming microorganisms. Also provided are a population of microorganisms made by the provided methods. Methods of culturing the population of microorganisms and methods of reducing xylitol production in cultures comprising the population of microorganisms are provided.

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