TABLE 1.

Preferred amino acids at given positions for Mtb 20SOG, Rhod20S, and bov20S

	Optimal amino acids at given position
	P3	P2	P1
Mtb20SOG	aromatic ≈ hydrophobic ≈ neutral ≈ basic	Gln ≈ Trp >> Orn ≈ Thr ≈ Ser ≈ Phe	Trp >> His > Tyr > Phe > Arg
Rhod20S	Tyr > Leu ≈ Trp ≈ Phe	non-defined	Leu > Phe ≈ Ile > Trp
Bov20S	Tyr > Trp > Phe > Leu > Arg	non-aromatic	Leu >> Arg ≈ Phe ≈ His > Met