Table 2. Comparison of kinetic parameters of selected Alrs.

NR, not reported.

		L-Ala→D-Ala			D-Ala→L-Ala
Enzyme	Monomer MW	K m (mM)	V max (U mg−1 †)	k cat (min−1)	K m (mM)	V max (U mg−1)	k cat (min−1)
CdAlr	43306	17.6	82.1	3558	7	26.7	1155
CdAlrK271T	43279	13.8	4533	196532	5.4	1797	77905
GsAlr‡	43339	4.3	2550	NR	2.7	1400	NR
SlaAlr§	39888	0.4	NR	3800	0.4	NR	3300
MtbAlr¶	40721	4	5.3	200	NR	NR	NR
MsmAlr¶	41053	8.5	1000	4300	NR	NR	NR
EcAlr††	41316	1.0	NR	3239	0.3	NR	347

^†One unit is defined as the amount of enzyme that racemizes 1 µmol of substrate per minute.

^‡Data from Inagaki et al. (1986 ▶).

^§Data from Noda et al. (2004 ▶).

^¶Data from Lee et al. (2013 ▶).

^††Data from Wu et al. (2008 ▶).