4.1.99.12	A137T	naturally occuring Rib3 mutant which is partially deficient in cytochromes a, a3, and cytochrome b, the respiratory defect elicited by this mutation cannot be explained by a flavin insufficiency based on the following evidence: 1. growth of the aE280/U1 on respiratory substrates is not rescued by exogenous riboflavin, 2. the levels of flavin nucleotides are not significantly different in the mutant and wild type, phenotype, overview	674407	
4.1.99.12	C59A	site-directed mutagenesis, the mutant shows 70% of wild-type enzyme activity	675342	
4.1.99.12	D21E	site-directed mutagenesis, inactive mutant	674406	
4.1.99.12	D21N	site-directed mutagenesis, inactive mutant	674406	
4.1.99.12	D30E	site-directed mutagenesis, inactive mutant	674406	
4.1.99.12	D32A	site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme	-, 728745	
4.1.99.12	D92A	site-directed mutagenesis, inactive mutant	675342	
4.1.99.12	E154D	DBPS activity is abolished	716533	
4.1.99.12	E163A	site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme	-, 728745	
4.1.99.12	E166A	site-directed mutagenesis, inactive mutant	675342