Proteins I

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Flashcards on Proteins I, created by J yadonknow on 05/01/2018.
J yadonknow
Flashcards by J yadonknow, updated more than 1 year ago
J yadonknow
Created by J yadonknow about 7 years ago
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Resource summary

Question Answer
What are proteins? Linear sequences of amino acids folded to form an elaborate functional product
What configurations of amino acids exist? L-amino acids are main configurations of aa in proteins D-amino acids exist but not in DNA encoded proteins
What do Gly, Ala, Ser, Cys and His represent? Gly=H Ala=CH3 Ser=CH2OH Cyst=CH2SH His= big fucker
Draw a diagram showing the bonding in a dipeptide Partial double bond characteristic between C=O and N of peptide bond, can't rotate Rotation dictated by the sigma bounds between c-CO and c-NH
Draw a polypeptide diagram, what does n represent? Number of amino acid residues
In a single amino acid, which atom is good for what type of H-bond formation? O= good H-bond acceptor N:= good H-bond donor
Define secondary structure Local 3 dimensional shape of a polypeptide sequence as a result of electrostatic interactions between neighbouring residues
Describe the features of an a-helix R-handed helix 3.6 residues per turn good H-bonding Rigid laterally Stretch longitudinally Side-chains point out from a-helix 100' to preceeding one, more available for interactions
Which amino acids are helix formers? Glutamate, Glutamine, Ala, His
Which amino acid is a helix destabiliser? Tyr
Which amino acid is a helix breaker? Proline
How does it do this? Proline residue binds with the N of the amino group on Calpha. Therefore Calpha-N bond can't rotate as a result of the protein's cyclical shape.
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