Table 1.

Retroviral and retroviral-like PRs in Protein Data Bank. Coordinate files available in the PDB are shown for retroviral (A) and Ddi1/Ddi2 retroviral-like PRs (B). Only some representative PDB IDs are presented if >10 coordinate files are available. For HIV-1, only an approximate value is shown, based on a refined search on text-(on ‘HIV-1 protease’) and structure title-search (on ‘HIV-1′ and ‘protease’). Database was accessed in October 2019.

(A)
Retrovirus Genus	Representative Virus	Name	Number of IDs	PDB ID	Reference
Lentiviruses	Human Immunodeficiency virus type 1	HIV-1	>600	5HVP	[14]
				1G6L	[15]
				3PHV	[16]
				1ZTZ	[17]
				4LL3	[18]
				7HVP	[19]
				5YOK	[20]
				4Z4X	[21]
				1TW7	[22]
	Human Immunodeficiency virus type 2	HIV-2	19	1HII	[23]
				5UPJ, 6UPJ	[24]
				2HPE	to be published
				3EBZ	[25]
	Equine infectious anemia virus	EIAV	2	1FMB	[26]
				2FMB	[27]
	Simian Immunodeficiency virus	SIV	7	1SIV	[28]
				1TCW	[29]
				1YTI, 1YTJ, 1YTH, 1YTG	[30]
				1AZ5	[31]
	Feline immunodeficiency virus	FIV	10	4FIV	[27]
				1FIV	[32]
				2FIV, 3FIV	[33]
				5FIV, 6FIV, 1B11	[34]
				2HAH	[35]
				3OGP, 3OGQ	[36]
Spumaretroviruses	Simian Foamy virus	SFV	1	2JYS	[37]
Alpharetroviruses	Avian myeloblastosis virus	AMV	1	1MVP	[38]
	Rous Sarcoma Virus	RSV	2	1BAI	[39]
				2RSP	[40]
Deltaretroviruses	Human T-lymphotropic virus type 1	HTLV-1	10	3LIY, 3LIX, 3LIV, 3LIQ, 3LIN, 3LIT	[41]
				3WSJ, 4YDF, 4YDG	[42]
				2B7F	[43]
Epsilonretroviruses	Walleye epidermal hyperplasia virus type 1	WEHV-1	0	-	-
Gammaretroviruses	Xenotropic murine leukemia virus-related virus	XMRV	5	4EXH	[44]
				3SLZ, 3SM1, 3SM2	[45]
				3NR6	[46]
Betaretroviruses	Mason–Pfizer monkey virus	MPMV	5	6S1U, 6S1W, 6S1V	[47]
				3SQF	[48]
				1NSO	[49]
(B)
Protein	Organism	Name	IDs	PDB ID	Reference
Non-viral (eukaryotic)	Saccharomyces cerevisiae	Ddi1-Sc	2	2I1A	[5]
				4Z2Z	[7]
	Homo sapiens	Ddi1-Hs	1	3S8I	to be published
		Ddi2-Hs	1	4RGH	[6]
	Leishmania major	Ddi1-Lm	2	5YS4, 5YQ8	[8]