CGSC Strain#: 4434
Strain Designation: MC102      Source of Strain: A. Markovitz
Sex: F- Chromosomal Markers: araC14, leuB6(Am), secA206(aziR), fhuA23, lacY1, tsx-67, lon-9, galK2(Oc), λ^-, trpE38, rpsL109(strR), xylA5, mtl-1, thiE1
Strain Comments:

• This strain has a tendency to die in the cold.
• leuB6(Am)-- Suppressed by serU suppressor (supH)
• lon-9-- = capR9 of Markovitz.
• galK2(Oc)-- is a GAA(glu) to TAA(ochre) mutation, residue 134. Oller et al.1993. Apparently non-suppressible, since all revertants found were at the ochre site.
• galK2(Oc) was formerly called gal₂
• thiE1 was formerly called thi-1
• Am = amber(UAG) mutation
• aziR = azide resistance
• Oc = ochre(UAA) mutation
• strR = streptomycin resist.

References:

• Markovitz, A. 1964. Regulatory mechanism for synthesis of capsular polysaccharide in mucoid mutants of Escherichia coli K-12. Proc.Natl.Acad.Sci.USA 51:239-240