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SIB2004 1

An Introduction To Protein Structure

QuestionAnswer
The protein Ribonuclease contains 8 cysteine amino acids. The protein is denatured in 8M urea and a reducing agent is added. Assume that all cysteine bonds are broken and can recombine randomly.How many combinations of disulphide bonds are possible? Refer to notes
Which of the following amino acids would you NOT expect to find in the hydrophobic core of a globular protein? a) Alanine b) Phenylalanine c) Valine d) Serine Refer to notes
Which amino acid side chain would have a no charged groups at pH 7.0? a) Arginine b) Glutamate c) Lysine d) Alanine Refer to notes
The spatial arrangement of helices and strands within a single polypeptide chain is called the: a) Primary structure b) Secondary structure c) Tertiary structure d) Quaternary structure Refer to notes
Which of the following amino acids is polar? a) Alanine b) Valine c) Lysine d) Leucine Refer to notes
What are the four levels of structure determine the shape of proteins? Primary, Seconday, Tertiary and Quaternary.
What is a Primary Structure? The linear sequence of amino acids.
What is a Secondary Structure? the localized organization of parts of a polypeptide chain (e.g., the alpha helix or beta-pleated sheet).
What is a Tertiary Structure? The overall, three-dimensional arrangement of the polypeptide chain.
What is a Quaternary Structure? The association of two or more polypeptides into a multi-subunit complex.
What is a protein? Proteins are single, unbranched chains of amino acid monomers.
How many amino acids are there? 20.
What determines a protein's 3D structure? (conformation) A protein's amino acid sequence.
What determines the function of a protein? A protein’s structure.
What is the structural form of L-Alanine? Refer to notes.
What is the structural form of D-Alanine? Refer to notes.
All amino acids have the same general structure but what is different for each of them? The side chain (R group) of each is different.
What are the nonpolar, aliphatic R groups? Glycine, Alanine, Leucine, Methionine, Isoleucine and Valine.
What are the aromatic R groups? Phenylalanine, Tyrosine and Tryptophan.
What are the polar, uncharged R groups? Serine, Threonine, Cysteine, Proline, Asparagine and Glutamine.
What are the positively charged R groups? Lysine, Arginine and Histidine.
What are the negatively charged R groups? Asparate and Glutamate.
In what form do isolated amino acids exist in solution? Zwitterionic form.
In what form do proteins exist in solution? A polypeptide chain, with a positive N-terminus, negative C-terminus.
What type of bond is usually represented by a dashed line? Hydrogen bonds.
Created by: Groberts00
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