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Glycolytic Pathway in Rumen Microorganisms¹

University of Nebraska, Lincoln

Abstract

Glucose metabolism by rumen microorganisms was inhibited by fluoride and iodoacetate. Glucokinase, glucosephosphate isomerase and aldolase activities were demonstrated by specific enzyme assays in cell-free extracts of rumen microorganisms. Pyruvate formation from fructose diphosphate or phosphoglycerate was demonstrated in incubations with cellfree extracts of rumen microorganisms in the presence of necessary co-factors.

These results combined with isotope studies of glucose metabolism clearly indicate that glucose is metabolized by glycolysis. The pyruvate formed could then be converted to volatile fatty acids as reviewed by several authors.

¹ Published with the approval of the Director as Paper No. 1984, Journal Series, Nebraska Agricultural Experiment Station. Project 15-10 of the Department of Biochemistry and Nutrition contributing to Regional Research Project NC-63. Some of these data were taken from a thesis submitted by the senior author to the Graduate College, University of Nebraska, in partial fulfillment of the requirements for the Ph.D. degree.

² Present address: Department of Pathology, College of Veterinary Medicine, Colorado State University, Fort Collins.