CGSC Strain#: 5054
Strain Designation: IB5      Source of Strain: G.R. Bjork
Sex: F- Chromosomal Markers: thr-1, leuB6(Am), fhuA2::IS2, glnX44(AS), gal-3, his-65, relA2, malT1(λ^R), xyl-7, mtlA2, argH46, trmA5, thiE1
Strain Comments:

• leuB6(Am)-- Suppressed by serU suppressor (supH)
• glnX44(AS)-- Mutation is a C to T transition at nucleotide 34 (3rd position of the anticodon)
• fhuA2::IS2 was formerly called fhuA2
• glnX44(AS) was formerly called su⁺_II
• glnX44(AS) was formerly called supE44
• glnX44(AS) was formerly called glnV44
• thiE1 was formerly called thi-1
• xyl-7 was formerly called xylA7
• ::IS2 = Insertion of IS2
• Am = amber(UAG) mutation
• AS = amber(UAG) suppressor
• LamR = Lambda-resistant

References:

• Bjork, G.R., L.A. Isaksson 1970. Isolation of mutants of Escherichia coli lacking 5-methyluracil in transfer ribonucleic acid or 1-methylguanine in ribosomal RNA. J.Mol.Biol. 51:83-100