Amino Acid Charges at Various pH
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Can someone check my answers to the following, please make any corrections and explanations as needed.
N---Tyr---Lys---Thr---C
pka 9.1 10.1 10.5 13 2.6
ph2 +1 0 +1 0 0 =+2
ph6 +1 0 +1 0 -1 =+1
ph13 0 -1 0 0 -1 =-2
N---Asp---Met---Ala---C
ph2 +1 0 0 0 0 =+1
ph6 +1 0 0 0 -1 =0
ph13 0 0 0 0 -1 = -1
N---Asp---Cys---Arg---C
ph2 +1 0 0 +1 0 =+2
ph6 +1 0 0 +1 -1 =-1
ph13 0 0 -1 0 -1 =-2.
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N---Tyr---Lys---Thr---C
pka 9.1 10.1 10.5 13 2.6
ph2 +1 0 +1 0 0 =+2
ph6 +1 0 +1 0 -1 =+1
ph13 0 -1 0 0 -1 =-2
This looks good, except the pK of the Thr R group at 13. The table I looked it up in said 13.6. If it's 13.6, then at pH 13, Thr would be neutral as you indicated. If the pK is 13, then at pH 13, half of it ...
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