Table 1.

List of identified viroporin proteins.^a

Name of virus	Name of viroporin	# of amino acid	Oligomeric state	Ion or substrate	References
IAV	M2	97	Tetramer	H+	Ref. [37], [38], [74]
IBV	BM2	115	Tetramer	H+	Ref. [39]
HCV	p7	63	Hexamer	Cation	Ref. [18], [62]
HIV-1	Vpu	81	Pentamer	Cation	Ref. [70], [71], [90]
SARS-CoV	3a	274	Tetramer	K+	Ref. [72]
	E	76	Pentamer	Na+, K+	Ref. [91]
Alphavirus	6 K	61	N/A b	Na+, K+, Ca2 +	Ref. [8]
Poliovirus	VP4	68	N/A b	RNA	Ref. [23]
	2B	97	N/A b	Ca2 +	Ref. [7], [92]
HPV	E5	83	N/A b	N/A	Ref. [93], [94]
PBCV-1	Kcv	94	Tetramer	K+	Ref. [21], [95]

^aThe viruses listed are influenza A virus (IAV), influenza B virus (IBV), hepatitis C virus (HCV), human immunodeficiency virus type 1 (HIV-1), severe acute respiratory syndromes-associated coronavirus (SARS-CoV), alphavirus, poliovirus, human papillomavirus (HPV), and Paramecium bursaria chlorella virus 1 (PBCV-1).

^bPore formation indicated but a defined oligomeric state either does not exist or is not characterized.