TABLE 1.

M. xanthus is sensitive to hexose analogs^a

Hexoseb	Efficiency of platingc
	DK1622	DK1622::pAY703	DK1622::pAY1108
None	1.0	1.0	1.0
2% Glc	0.6	0.5	0.5
1% 2dGlc	3 × 10−6	3 × 10−6	<10−8
2% MeGlc	0.9	0.9	0.8
2% GlcN	<10−8	<10−8	<10−8
2% GlcNAc	0.6	0.6	0.4
2% Fru	0.5	0.6	0.7
2% Mtl	0.8	0.6	0.6

^aWild-type strain DK1622 and its derivatives with plasmids pAY703 and pAY1108 (expressing the E. coli glk gene) integrated at the mglBA locus were grown to a density of 5 × 10⁸/ml at 32°C in CTPM medium. 

^bDilutions of each culture were plated on CTPM medium or medium supplemented with each of the hexose analogs. Colonies were counted after 7 days of growth at 32°C. 

^cCalculated as the titer of each culture on a given medium divided by its titer on CTPM medium without added hexose. Numbers are the averages of at least three determinations and varied less than fivefold.