six chromosomal uncf mutants of escherichia coli defective in the b subunit of h+-atpase ( 156 amino acid residues ) were identified ( kf92 , met-1 -- -- val ; kf164 , gln-64 -- -- end ; kf61 and kf144 , gln-104 -- -- end ; kf138 , gln-106 -- -- end ; and kf79 , gln-123 -- -- end ) .
C0002520
amino acid
C0017797
gln