Amino Acids Flashcards
What is the L and D isomer for amino acids
L is the one used for protiens, has nh3 out and one far left
D has nh3 out and on far right
At low ph what will happen to the N and C terminus
At high ph
And mid ph
Low ph more acid so both groups are protonated (nh3+ and COOH)
High ph more basic so both groups deprotonated (h2N and COO-)
Nod is zwitterionic from so H3N+ an COO-
Isoleucine is a ___ isomer of leucine
Constitutional
Methionine is less reactive because
It has a sulfur group but not at the end so it’s less reactive
Cysteine is considered ____ because why?
Hydrophobic because of sulfur group which is bigger and can’t form h bonds
What is special about lysine
It has a amino group at the end that is usually protonated
What is special about histidine
What imidazole in its r group meaning the n can be protonated
What is the pka of the COOH in amino acids
3.1
What is the pka of the COOH in aspartic and glutamic acid
4.1
What is the PKA of the r group in histidine
6 (almost neutral)
What is the pka of NH3+ in amino acids
8
What is the pka of S-H in cysteine
8.3
Pka of oh on tyrosine
10.9
Pka of the NH3+ on lysine
10.8
Pka of the c surrounded by NH2 on argenine
12.5
