Table 1.

Comparative analysis of hydrogen bonds formed during the interaction of hACE2 and RBD residues of one control and two variants.

Sl. no.	Variant	Number of hydrogen bonds (H-bonds)	Residues involve in hydrogen bond (ACE2_Spike protein)	Hydrogen bond length
1	Wuhan strain	9	TYR83-ASN487 ASP30-LYS417 ASP38-TYR449 GLN42-TYR449 GLN42-GLy446 TYR41-THR500 LYS353-GLY496 LYS353-GLY502 ASP355-THR500	2.302 Å 2.423 Å 2.369 Å 2.582 Å 2.885 Å 2.553 Å 2.734 Å 2.703 Å 3.529 Å
2	B.1.1.7 (UK) variant	11	GLN24-ASN487 TYR83-ASN487 ASP30-LYS417 GLU35-GLN493 ASP38-TYR449 GLN42-TYR449 GLN42-GLy446 TYR41-THR500 LYS353-GLY496 LYS353-GLY502 LYS353-TYR501	2.688 Å 2.788 Å 2.905 Å 3.132 Å 2.695 Å 2.778 Å 3.244 Å 2.707 Å 3.084 Å 2.784 Å 2.766 Å
3	B.1.617 (Indian) variant	10	GLN24-ASN487 TYR83-ASN487 ASP30-LYS417 GLU35-GLN493 ASP38-TYR449 GLN42-TYR449 GLN42-GLy446 TYR41-THR500 LYS353-GLY496 LYS353-GLY502	2.688 Å 2.788 Å 2.905 Å 3.132 Å 2.695 Å 2.788 Å 3.244 Å 2.707 Å 3.084 Å 2.784 Å