CGSC Strain#: 4429
Strain Designation: Y53      Source of Strain: J. Lederberg
Sex: F- Chromosomal Markers: thr-1, leuB6(Am), lacY1, glnX44(AS), rfbC1, thiE1
Strain Comments:

• The lacY1 marker was said to be unstable in this strain when originally isolated.
• leuB6(Am)-- Suppressed by serU suppressor (supH)
• glnX44(AS)-- Mutation is a C to T transition at nucleotide 34 (3rd position of the anticodon)
• glnX44(AS) was formerly called su⁺_II
• glnX44(AS) was formerly called supE44
• glnX44(AS) was formerly called glnV44
• rfbC1 was formerly called rfbD1
• thiE1 was formerly called thi-1
• Am = amber(UAG) mutation
• AS = amber(UAG) suppressor

References:

• Lederberg, J. 1947. Gene recombination and linked segregations in Escherichia coli. Genetics 32:505-525
• Lederberg, E.M. 1952. Allelic relationships and reverse mutation in Escherichia coli. Genetics 37:469-483