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Intro to AA and stru

Intro to Amino Acids

QuestionAnswer
Non-polar, aliphatic R groups Glycine, Alanine, Proline, Valine, Leucine, Isoleucin, Methionine
Aromatic R groups Phenylalanine, Tyrosine, Tryptophan
Polar uncharged groups Serine, Threonine, cysteine, Asparagine, Glutamine
Positively charged R groups Arginine, Lysine, Histidine
Negatively charged R groups Glutamate, Aspartate
Name several factors disulfide bond formation depend on # of cysteine residues, proximity effects, reactivity of SH groups, Redox state of glutathione (GSH)
Ionic interactions Strength or force of interactions depend on the magnitude of the charge Q, the inverse of the square of the distance between charged groups and the inverse of the dielectric constant
What is the dielectric constant in a vacuum? Hexane? Water? Vacuum=1, Hexane=2 and water=80. Organic solvents have relatively low dielectric constants
What weakens the force of interaction? Ions in solution in the vicinity of the charged residues.
What is the isoelectric point (pI)? The pH value at which a protein is electrically neutral. If the pH is greater than the pI, the protein will be negatively charged.
Type I beta turn Contains a Pro residue in position 2. More common
Type II beta turn Contains a Gly in position 3