TABLE 1.

Properties of 10 mutants suppressing novobiocin hypersensitivity of mukB null mutation

Strain	Growth at 22°C with indicated concn of novobiocin (μg/ml)a					Colony-forming ability atb:		Formation of anucleate cellsc
	0	20	100	300	500	22°C	37°C
YK1100	+	+	+	−	−	1	1.3	−
AZ5372	+	+	−	−	−	1	<2 × 10−6	++
MQ40	+	+	+	+	+	1	6.5 × 10−3	++
MQ41	+	+	+	+	+	1	1.2 × 10−2	++
MQ43	+	+	+	+	+	1	<2 × 10−6	++
MQ44	+	+	+	+	+	1	<2 × 10−6	++
MQ45	+	+	+	+	+	1	<2 × 10−6	++
MQ46	+	+	+	+	+	1	<2 × 10−6	++
MQ47	+	+	+	+	+	1	<2 × 10−6	++
MQ48	+	+	+	+	+	1	<2 × 10−6	++
MQ49	+	+	+	+	+	1	<2 × 10−6	++
MQ50	+	+	+	+	+	1	<2 × 10−6	++

^a+, growth; −, no growth.

^bColony-forming ability on LB agar medium at 22°C was defined as 1.

^c−, no anucleate cell; ++, many anucleate cells.