Table 6.

Interactions between ACE2 and Spike proteins: (a) hydrogen bonds, (b) salt bridges.

ACE2	DISTANCE (Ao)	SPIKE
Lys 353 [NZ]	2.65	Asp 320 [OD1]
Lys 68 [NZ]	2.87	Tyr 449 [OH]
Gln 24 [NE2]	3.01	Ala 475 [O]
Asp 30 [OD2]	2.71	Lys 417 [NZ]
Asp 38 [OD2]	3.07	Tyr 453 [OH]
Gln 24 [OE1]	3.86	Ser 477 [OG]
Tyr 83 [OH]	2.92	Asn 487 [ND2]
Glu 35 [OE2]	2.99	Gln 493 [NE2]
Tyr 41 [OH]	2.68	Gly 502 [N]
Asp 355 [OD1]	2.67	Val 503 [N]
Asp 38 [OD1]	2.63	Tyr 505 [OH]
Gln 42 [OE1]	3.50	Tyr 449 [OH]
ACE2	DISTANCE (Ao)	SPIKE
Lys 353 [NZ]	2.65	Asp 405 [OD1]
Lys 353 [NZ]	3.48	Asp 405 [OD2]
Asp 38 [OD1]	3.64	Asp 403 [NH2]
Asp 30 [OD1]	3.32	Lys 417 [NZ]
Asp 30 [OD2]	2.71	Lys 417 [NZ]