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16 Feb 2019

Why is glycine the only amino acid commonly observed in peptides in conformations with phi and psi values which are not restricted to the values in the Ramachandran plot below?

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Jean KeelingLv2

18 Feb 2019

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Related questions

1. Which one of the following peptides will show the strongest absorbance of UV light at a wavelength of 280 nm? a. ESLALRIFPTV

b. YDQHHWRIYTS

c. HSIVYDGN

d. NQTRSTRHS

e. HNSLRHMTP

2. In a multiple sequence alignment, which of the following pairs or groups of amino acids would NOT be considered similar? a. E and D

b. F and P

c. I, L, and M

d. S and T

e. K and R

3. On a Ramachandran plot, which amino acid would show the largest range of Ï and Ï angles?

a. D

b. S

c. C

d. P

e. G

Thank you so much!

Please I need help with these questions

1. The word "quaternary" structure refers to which case of "4"?

a)the 4^th residue in the sequence just those proteins with 4 total subunits, such as hemoglobin

b)proteins with any number of multiple subunits, regardless of the total number (2, 3, 4, 5, ...)

c) the number of residues per turn in an alpha helix (3.6 rounded off to the closest integer, which is 4)

d)the number of residues (4 total) needed to make a beta turn

2. The Ramachandran plot depicts which of the following?

a.sterically permitted rotational (dihedral) angles along the backbone chain

b.the polar and nonpolar sides of helices, using circular graph paper

c.the cysteine pairing pattern in a protein having several disulfide bonds

3. The "level" of protein structure involving repetition of a particular choice of phi and psi angles is which of the following?

a. primary structure

b. secondary structure

c. tertiary structure

d. quaternary structure

Assuming that the mutations are adaptive, how would that affect the stability of a protein at low and high temperatures?

Given:

1) Glutamine to lysine in a warm adapted species.Glutamine is uncharged while lysine is positively charged, therefore there would likely be a change as an uncharged amino acid is being replaced with positively charged amino acid.

2) Threonine to Alanine in a warm adapted species. Threonine is polar uncharged while Alanine is hydrophobictherefore there would likely be a change, as a polar charged amino acid is being replaced with a hydrophobic amino acid.

3) Glutamic acid to aspartic acid in a cold adapted species. Both Aspartic acid to Glutamic acid are negatively charged, therefore, there would likely be no effect with this change as both are negatively charged amino acids.

4) Glycine to alanine in a warm adapted species. Both Glycine to Alanine are non polar amino acids, therefore the change would likely have no effect as both are non polar and hydrophobic.