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The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction is shown below.
B. At what pH does [A-]=[HA]?
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- The side chain of acetyl-L-lysine-OMe has a pKa=10.5 and its acid-dissociation reaction is shown below. A.. for this reaction, which form of lysine represents A- and which is HA?4b) Canavanine is closely related to arginine, and like arginine its side group has a +1 charge when protonated. If you dissolved canavanine in an aqueous solution at pH 10, what would the net charge on a molecule of canavanine be? Please show your work or make it clear how you determined the charge contribution from each ionizable group.According to the paper, F486 is a phenylalanine residue (i.e., an amino acid that is part of a chain that forms a protein) on SARS-CoV-2. It has an important interaction with ACE2 (best seen in Fig. 1(C) and Fig. 2(A)). Looking at this phenylalanine and the green residues surrounding it, which statement best describes the interaction that could be occurring? a) It forms a hydrogen bond with Y83. b) It forms a dipole-dipole interaction with M82. c) It forms London dispersion forces with surrounding residues. d) It encounters repulsions from surrounding residues.
- In the case of serine, threonine and tyrosine they have the -OH group in their residue. I'm wondering even though all of them has the -OH groups in their residue. but only the tyrosine has the pKa value with the -OH grouup.(b) Describe how the charge of some amino groups in a protein might differ at pH 9.0 and pH 5.0. the charge on the amino group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (c) Describe how the charge of some carboxyl groups in a protein might differ at pH 9.0 and pH 5.0. charge on carboxyl group will differ at pH 5 and pH 9 which will depend on the pKa of the amino acid. (d) Given your answers to parts (b) and (c), what kind of intramolecular interactions in beta-galactosidase are most likely to be affected by a change in pH from 9.0 to 5.0? (e) Could the interactions you mention in part (d) affect the catalytic activity of beta-galactosidase?Rank the pKa values of the conjugate acids for nosylate, tosylate, and brosylate
- 1, on derivative curves, there are several sharp peaks. what points in the ionisation of the amino acid do these peaks represent? 2. what is the relationship between equivalence points and the PKA of each ionisable groupsExplain why the pI of lysine is the average of the pKa values of its two protonated amino groups.Tyrosine is an amino acid whose side chain has a pKa of 10.1. At pH 7, what protonation form would you expect to find it in?
- Explain why the pKa of the - NH3+ group of an a-amino acid is lower than the pKa of the ammonium ion derived from a 1° amine (RNH3+). For example the pKa of the - NH3+ group of alanine is 9.87 but the pKa of CH3NH3+ is 10.63.Valine has pKa's of 2.286 and 9.719. Estimate the fractional composition of Valine in the -1 form at pH=6.1. Taking the structure of the amino acids into account, give a comparative discussion pK values where histidine=2 and alanine=2.