TABLE 2.

ADP-PFK activities in archaea^a

Microorganism	Growth temp (°C)	Hydrogenase activity (U/mg)	ADP-PFK activity (mU/mg)	ATP-PFK activity (mU/mg)
P. furiosus	100	NMb	150	2.6
T. litoralisd	85	NM	200	NM
M. jannaschii	80	28	21	ND
M. igneus	80	67	16	ND
M. thermolithotrophicus	65	130	18	3.8
M. maripaludis	37	23	2.7	ND
M. mazei	37	140	6.1	ND
M. concilii	37	NDc	29	38

^aEnzyme activities were determined as described in Materials and Methods. No PFK activity could be detected in M. thermoautotrophicum, M. kandleri,M. fervidus, or M. hungatei extracts. 

^bNM, not measured. 

^cND, not detectable. 

^dSelig et al. 1997 (23).