Table 1. List of the archaeal proteins reported to be phosphorylated up to date.

No	Protein	Organism	Residue	Evidence for phosphorylation	Reference
1	CheA	H. salinarum	His	32P incorporation	Rudolph, J., Oesterhelt.D., 1995
2	CheY	H. salinarum	Asp	32P incorporation	Rudolph, J., et al., 1995
3	Methyltransferase-activating protein	M. barkeri	Ser,Thr or Tyr	32P incorporation	Daas, P. J. H., et al., 1996
4	Cdc6	M. thermoautotrophicum	Ser	32P incorporation	Grabowski, B., Kelman, Z., 2001
5	Cdc6	P. aerophilum	Ser	32P incorporation	Grabowski, B., Kelman, Z., 2001
6	Cdc6	S. solfataricus	Ser	32P incorporation	De Felice, M., et al., 2003
7	Q9HH97, Glycogen synthase	S. acidocaldarius	Ser or Thr	32P incorporation	Cardona, S., et al., 2001
8	aIF2	P. horikoshii	Ser48	32P incorporation (in vitro)	Tahara, M., et al., 2004
9	Phenylalanyl-tRNA synthetase β-chain	T. kodakaraensis KOD1	Tyr	Anti-phosphotyrosine antibodies	Jeon, S.-J., et al., 2002
10	Phosphomannomutase, pmm	T. kodakaraensis KOD1	Tyr	Anti-phosphotyrosine antibodies	Jeon, S.-J., et al., 2002
11	RtcB, RNA 3′-terminal-phosphate cyclase	T. kodakaraensis KOD1	Tyr	Anti-phosphotyrosine antibodies	Jeon, S.-J., et al., 2002
12	APE2, Leucyl aminopeptidase	S. solfataricus	Ser or Thr	32P incorporation	Condo, I., et al., 1998
13	SsoPK2, putative protein serine kinase	S. solfataricus	Ser	32P incorporation	Lower, B. H., Kennelly, P. J., 2003
14	SsoPK3, putative protein serine kinase	S. solfataricus	Thr	32P incorporation/Mass Spectrometry	Lower, B. H., et al., 2004
15	sso0207, putative phosphohexomutase	S. solfataricus P1	Ser	32P incorporation/Mass Spectrometry	Solow, B. et al. 1998/Ray, W. K. et al. 2005
16	O28471, putative protein serine kinase	A. fulgidus	Ser108	32P incorporation/Edman sequencing	LaRonde-LeBlanc, N., et al., 2005
17	Beta-1 subunit of 20S proteasome	H. volcanii	Ser129	Mass Spectrometry	Humbard, M. A., et al., 2006