Table 2. Hydrogen Bonding Energies in kcal/mol computed using Implicit Solvation Molecular Mechanics on residue pairs.

Acceptor Residue	Hydrogen Bonding Interaction with Donor Residue
	Arg Collinear	Arg Coplanar	Lys	Amide
Glu	−4.1	−11.1	−6.1	−1.5
pSer(−2)	−9.1	−19.7	−10.5	−3.1
pSer(−1)	−5.1	−11.8	−7.1	−2.6
pTyr(−2)	−8.3	−15.6	−8.2	−1.7
pTyr(−1)	−6.7	−11.6	−6.9	−2.7
sTyr	−3.7	−6.0	−4.4	−2.9

Energies are reported as the difference between the interaction energy of the residue pair at the minimum energy and at a distance of 11 Å.