TABLE 2.

Growth characteristics of the classes Methanococci and Methanopyri and presence of genes for formate transport (FT), formate dehydrogenase (fdh), hydrogenases (eha, ehb, frh, vhu, hmd), and purine biosynthesis (purT, purP).

Organism	Topt (°C)	Growth*	FT	fdh	eha	ehb	frh	vhu	hmd	purT	purP
Methanocaldococcus jannaschii JAL-1a	85	–		⚫	⚫	⚫	⚫⚫	⚫	⚫⚫⚫	⚫	⚫
Methanocaldococcus bathoardescens JH146b	82	–		⚫	⚫	⚫	⚫⚫	⚫	⚫⚫⚫	⚫	⚫
Methanocaldococcus fervens AG86c	85	ND	⚫	⚫	⚫	⚫	⚫	⚫	⚫⚫	⚫	⚫
Methanocaldococcus infernus MEd	85	–			⚫	⚫	⚫	⚫	⚫	⚫	⚫
Methanocaldococcus vulcanius M7e	80	–		⚫	⚫	⚫	⚫⚫	⚫⚫	⚫⚫⚫	⚫	⚫
Methanotorris igneus Kol 5f	88	–		⚫	⚫	⚫	⚫⚫⚫	⚫⚫	⚫⚫	⚫	⚫
Methanotorris formicicus Mc-S-70g	75	+	+	+	+	+	+	+	+	+	+
Methanothermococcus okinawensis IH1h	65	+	⚫	⚫	⚫	⚫	⚫⚫	⚫⚫	⚫	⚫	⚫
Methanothermococcus thermolithotrophicus SN 1i	65	+	+	+	+	+	+	+	+	+	+
Methanofervidicoccus abyssi HHBj	70	–			+	+	+	+	+	+	+
Methanopyrus kandleri AV19k	98	–		⚫	⚫		⚫⚫	⚫	⚫		⚫

The number of circles per column represents the number of times the gene(s) for that complex appears in the organism’s genome.

*Growth on formate; ND, not determined.

+ In protein columns indicates genes present in draft genome sequence.

References and genome accession numbers: ^aJones et al. (1983a), L77117; ^bVer Eecke et al. (2013), CP009149; ^cZhao et al. (1988), CP001696; ^dJeanthon et al. (1998), CP002009; ^eJeanthon et al. (1999), CP001787; ^fBurggraf et al. (1990), CP002737; ^gTakai et al. (2004a), AGJL01000032; ^hTakai et al. (2002), CP002792; ⁱHuber et al. (1982), AQXV01000039; ^jSakai et al. (2019), BFAX0000000; ^kKurr et al. (1991), AE009439.