Amino Acids

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1
What is the Post-Translational Modification for Kinases:
Phosphorylation caused by kinases, Serine and Threonine kinases and Tyrosine kinases.
2
What is an Indel:
Mashup of insertions and deletion, these cause frameshifts.
3
Base substitutions?
Change one nucleic base to another
4
Base substitutions at DNA level:
Transitions - Base sequence changes but amino acid product stays the same. Transversion - Base sequence changes and amino acid product changes.
5
Base substitutions at Protein (Molecular) level:
Synonymous (silent) mutation is base sequence changes but still encodes amino acid. Nonsense mutation is base sequence changes and coding codon changes to stop codon. Missense mutation when coding codon is change to a codon for a different amino acid. Conservative - Amino acid is relatively the same, Non conservative - Different size, Charge and Polarity.
6
Postively charged amino acids?
Arginine, Histidine, Lysine
7
Negatively charged amino acids?
Glutamic acid and Aspartic acid
8
Polar amino acids?
Serine, Threonine, Asparagine, Glutamine, Tyrosine, Cysteine
9
Nonpolar amino acids?
Glycine, Alanine, Leucine, Isoleucine, Valine, Methionine, Tryptophan, Phenylalaline
10
Glycine and Alanine:
Very small R-group
11
Tryptophan:
Has 2 rings so large, only AA other than methionine to have only one codon.
12
Phenylalamine:
R group includes a phenyl ring, very large R-group
13
Valine, Leucine and Isoleucine:
Easily interchanged with no effect
14
Methionine:
1st Amino Acid AUG, contains Sulfur
15
Proline:
Ring with NH2 group prevents rotation, found at ends of alpha helices
16
Cysteine:
Terminal SH group allows for disulfide linkages; can hold shape or hold multiple polypeptides together with covalent bond.
17
Serine and Threonine:
Targets of Ser - Thr Kinases; Fairly interchangeable
18
Tyrosine:
Target of Tyr-kinases (usually receptor Tyr kinase). Starting material for melanin
19
Asparagine:
Target for N-linked Glycosylation
20
Glutamine:
The AA in RF1 or RF2 that coordinates water molecules for releasing Nascent Polypeptide
21
Arginine:
Ionizes at physiological pH to have a + charge (salt bridge).
22
Histidine:
Also ionizes + salt bridge, 6-10 in a row bind tightly to Nickel
23
Lysine:
Also ionizes + salt bridge, Target of Ubiquitylation
24
WHat is Ubiquitination?
An enzymatic post-translational modification in which a ubiquitin protein is attached to a substrate protein.
25
Aspartic acid and Glutamic acid:
Ionizes to form Strong - charge for salt bridges
26
What are Phosphomimotic Mutations?
The AA in RF1 or RF2 that coordinates water molecules for releasing Nascent polypeptide.
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