2007-01-08 06:26:32 · 4 answers · asked by Turnip 3 in Science & Mathematics ➔ Biology
Each different ionisable group on a molecule has its own pKa there are three different ionisable groups on lysine:
1. NH3+ (the amino group)
2. COO- (carboxylic group)
3. (CH2)4NH3+ (the charged R group for lysine)
2007-01-08 08:01:43 · answer #1 · answered by Ellie 4 · 0⤊ 0⤋
All amino acids have at least two pKa values since eah has an amino group (NH3+) and an acid group (COOH). Those amino acids that have an acid or an amine in the R-group (the part that varies on each of the amino acids) will have a third pKa value for the dissociation of the H+ on that group.
2007-01-08 06:49:53 · answer #2 · answered by teachbio 5 · 0⤊ 0⤋
Lysine is 2,6-diaminohexanoic acid. If you have the dihydrochloride, with two -NH3+ groups and a -COOH, then the three pKa's correspond to the loss of three protons (H+) in sequence.
2007-01-08 06:33:08 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋
Because it wants to, Just like Billie Piper said.
2007-01-08 09:18:32 · answer #4 · answered by Oracle Of Delphi 4 · 0⤊ 0⤋