BIOCHEM 2EE3 Study Guide - Final Guide: 310 Helix, Psi Beta, Relative Permittivity

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blackherring683

16 Apr 2018

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Primary structure - sequence of amino acids in polypeptide chain. Secondary structure - folds driven by peptide backbone interactions from 2 amino acids. Tertiary structure - driven by side chain interactions from 2 amino acids. Quaternary structure - interactions between more than one polypeptide chain. Secondary structure peptide bond is bw carbon and nitrogen this bond has restricted rotation and is denoted by omega (180 bond angle) bond bw n and c alpha is phi bond bw c-alpha and carbonyl carbon is psi. Electrostatic: strong interactions, long distance interactions, strength weakened on surface of proteins due to high dielectric constant of water. Hydrogen bonds: occur bw peptide groups and water on surface of protein but in core it is between peptide groups. Van der waals: short range interactions - very in uential when lots of them and have repulsive forces (can be strong when atoms too close together)

Related Questions

1. A sequence of amino acids in a certain protein is found to be â Ser â Gly â Pro â Gly â

The sequence is most probably part of a(n):

a. beta turn

b. antiparallel beta sheet

c. alpha-helix

d. parallel beta-sheet

e. alapha-sheet

2. Which statement about peptides bonds is NOT TRUE?

There is perfectly free rotation about the peptide bond.

The peptide bond has partial double-bond character.

The peptide bond is shorter than a normal carbon-nitrogen single bond.

The peptide bond usually has a trans configuration with respect to the alpha-carbons of the two amino acids involved in the peptide bond.

Peptide bonds are made via condensation of an amine and a carboxylic acid with loss of water.

3. Which of the following statements about proteins is FALSE?

	Active proteins are generally very loosely structured.
	In water-soluble proteins, hydrophobic amino acid residues are generally buried and not exposed to water.
	Primary structure determines tertiary structure.
	Secondary structure is regular, recurring arrangements in space of nearby amino acid residues in a polypeptide.
	Quaternary structure involves the interaction of subunits in a protein with more than one polypeptide chain.

maroonwallaby335

thank you

BIOCHEM 2EE3 Study Guide - Final Guide: 310 Helix, Psi Beta, Relative Permittivity

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