Effect of prometryne and indole-3-acetic acid on the chemical composition of yeast protein

Abstract The effect of different concentrations of prometryne and indole-3-acetic acid (IAA) on the protein content of Candida utilis 103, grown on the acid hydrolysate of sorghum stalks was investigated. Low concentrations of prometryne (5 × 10 −11 M) and IAA (2 × 10 −9 M) stimulated protein synthesis, while depression was observed at higher concentrations. Candida utilis 103, grown on the acid hydrolysate of sorghum stalks either untreated or treated with low concentrations of prometryne or IAA produced a protein containing highly soluble proteins. Electrophoresis of Candida utilis protein detected 14 peaks varying in their relative proportions. The treated Candida utilis protein contained the essential amino acids (lysine, leucine, isoleucine, phenylalanine, valine and threonine) in more than sufficient quantity as recommended by FAO. Treatment with IAA showed an increase in the amounts of methionine, valine and lysine (55.5, 29.4 and 17.2%, respectively) over that of the control.