(2) Remove the sequences with length of less than 50 amino acid residues and character of 'X'.
The use of DNA and protein sequence residues as character states for phylogenetic reconstruction was a profound breakthrough in biology [ 1].
Fig. S2) shows a good correlation for solvent-exposed mutants, implying that enzyme activity of these genetic variants is determined in part by the amount of tetramers and in part by the precise location of the mutant residue and the character of the change.
"Properties" indicates whether an amino acid residue has some character from a viewpoint.
The value of the cysteine pKa in proteins depends upon: (i) proximity of charged residues, (ii) dipole character of the α-helix, and (iii) hydrogen bonding to other residues none of which is known yet for the Na+ channel inactivated state.
The solvation is related also to the character of residue 37 in the sequences for the oligomers: in the Aβ sequence, it is G37 while in the tau it is D37, indicating that small residues are more solvated.
The latter mechanism is experimentally testable, since one would predict that a substrate with a P1 residue of a suitable character larger than an alanine could be trapped at the acyl-enzyme stage, bound to the catalytic serine.
Interestingly, mutant SU with substitution of Q396N retained the binding affinity to CXCR4, whereas, alteration of N398Q completely abrogated CXCR4 binding ability, although both residues were replaced by the same character of amino acid residue.
Beta sheet determination is then performed based on the summation of the magnitude of charges and the summation of the hydrophobic character of each residue in the 5-residue bracket.
For DR1 (DRB1*0101), a common human class II MHC protein and the subject of this study, the P1 pocket shows a strong preference for large hydrophobic side chains (Trp, Tyr, Phe, Leu and Ile), the P6 pocket has a strong preference for smaller residues (Gly, Ala, Ser and Pro) and the P4 and P9 pockets have weaker preference for residues with some aliphatic character [3].
