In order to investigate the catalytic role of the active site helical residues, site-directed mutagenesis was performed.
To further confirm Ser, Gly, Asn, Asp and His are active-site residues, site-directed mutagenesis was carried out to convert each of these residues to an Ala.
While, it was replaced by Ala in Nav1.8, which suggested this residue site is not necessary for BmK I acting on Nav1.8.
It also needs to be pointed out that two ways for applying SM are possible: (1) Use of one and the same codon degeneracy for randomizing combinatorially the entire multi-residue site; or (2) Use of a different codon degeneracy at each individual position of a multi-residue site.
Furthermore, since chemical cleavage usually targets specific residues or dipeptide linkages, the frequent presence of the single- or double-residue site recognized by these chemicals within the AA sequence of the target protein limits its use [332].
Cys is not definitively hydrophilic or hydrophobic, and it is an attractive residue site for directed target conjugation because its average abundance in naturally occurring proteins is estimated to be approximately 1%.
In that case, the constraint ensures that the other variables associated with the ith residue site are zero.
Since we have five groups (A, B, C, D, and E) and have different number of amino acids in each group, mi is different for each residue site.
The formulation of this problem also permits shared occupation by different amino acids belonging to the same group at the ith residue site are zero.
Assigning probabilities for each amino acid to occupy every residue site is another approach that has been followed for optimization in the sequence space [23], [24].
Only the Tpi-insulin2 A peptide contains a glycine residue site for amidation.
