MICROBIOLOGY: EVOLV.SCI.-W/ACCESS>CI<
4th Edition
ISBN: 9780393622805
Author: SLONCZEWSKI
Publisher: Norton custom
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Chapter 3.3, Problem 4TQ
Summary Introduction
To review:
The reason behind the presence of proteins at specific locations in the cell and also mention their inability to function everywhere within the cell.
Introduction:
Amino acids are the organic molecules composed of the side chain, carboxyl group, and an
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Where on a membrane would you find peripheral proteins? List at least 3 of the functions of peripheral proteins.
The tertiary structure of a protein is the 3-dimensional folding of the polypeptide chain. What types of bonds support the folding of proteins into this level of protein structure? Also, how do these bonds/interactions impact how a protein folds and its surface properties?
Can the tertiary structure of a protein depend on the type of cell system used for synthesis? Explain.
Part a) Would a single alpha helix be more stable in a aqueous solution or a membrane. Explain why.
Part b) Why do transmembrane proteins always have secondary structures inside the membrane but aqueous proteins do not?
Part c) If you had a single alpha helix, can it act as a pore for a membrane. Explain.
Chapter 3 Solutions
MICROBIOLOGY: EVOLV.SCI.-W/ACCESS>CI<
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- Biological membranes are critical components of cells that allow compartmentalisation of cellular contents. The diagram shows a biological membrane comprised of a lipid bilayer with a single polypeptide integrated into the membrane and spanning the membrane seven times. What types of amino acids are likely present in the parts of the polypeptide chain labelled 1-7 and in the parts of labelled A-G? What is the name of the effect that forces the polypeptide to arrange itself like this within the lipid bilayer? Give an example of a type of molecule that can move freely across the lipid bilayer and explain why it can do so based on its chemical properties.arrow_forwardCell membranes are fluid, and thus proteins can diffuse laterally within the lipid bilayer. However, sometimes the cell needs to localize proteins to a particular membrane domain. Name three mechanisms that a cell can use to restrict a protein to a particular place in the cell membrane.arrow_forwardNon covalent bonds are very important in cell biology, could you explain why and provide an example that illustrates their importance ( do not chose protein folding as an example) What are the different levels of protein structure and what are the different parameters (sequence, type of bonds, etc...) that influence protein folding at these different levels?arrow_forward
- There is a long chain of amino acids with long sections that are mostly polar, alternating with long sections that are nonpolar. How would this chain be organized if it were destined to become a transmembrane protein? A cytoplasmic protein?arrow_forwardWhich of the following is/are incorrect about the differences between globular and membrane proteins? 1. Membrane proteins are embedded in a lipid environment while globular proteins are solvated by water. 2. The surface of membrane proteins are likely to feature amino acid residues with hydrophobic side chains. 3. Globular proteins, because of their environment, do not have amino acid residues with hydrophobic side chains. 4. No membrane protein has any portions that are exposed to water. O 2 and 3 O 1 O 3 O 4 O 3 and 4arrow_forwardFigure 3.23 Which categories of amino acid would you expect to find on the surface of a soluble protein, and which would you expect to find in the interior? What distribution of amino acids would you expect to find in a protein embedded in a lipid bilayer?arrow_forward
- In what way do proteins embedded in a membrane differ structurally from soluble proteins?arrow_forwardwhat are three proteins that are abundantly present in ECM( Extracellular matrix)?arrow_forwarda) (i) Give THREE (3) amino acids that most likely can be located in the part of the trans- membrane protein that lies within the cell membrane. Explain why. (ii)Give THREE (3) amino acids that most likely can be located in the part of the transmembrane protein that lies outside the cell membrane. Explain why.arrow_forward
- In the figure below, protein 1 is located in the cytosol, and protein 2 is membrane bound. Give 3 specific examples from Figure 4-3 of amino acids that you might expect to find on the surface of protein 1. For protein 2, give three specific amino acids that you would expect to be on the surface near both points A and B (labeled with stars). To clarify, you should choose 3 amino acids for point A and also list three amino acids for point B. All of the amino acids you choose for Protein 2 must be different from those that you choose for Protein 1. Rationalize your choices by discussing the amino acids you chose, and their properties in a few sentences. Protein 1 Protein 2arrow_forward1. Integral and peripheral membrane proteins employ multiple strategies to keep them associated to a biological membrane. View these three proteins below, and for each protein shown, answer the following questions: A) What type of membrane protein is this? Integral, peripheral, monotopic, polytopic? How do you know? Justify your label by features of the protein shown in the image. B) Describe the overall tertiary structure of each protein. Be certain to mention hydrophilicity/hydrophobicity of the surfaces of this protein. C) Provide a detailed description of how each protein is held associated to the biological membrane. Protein 2 Protein 3 Protein 1 "H,N. Exterior Cytosolarrow_forwardIn the figure below, an integral membrane protein is shown. These proteins sit inside of cell membranes. Some integral proteins are membrane channels or transporters, while others serve as enzymes, receptors, or anchors. Describe the differences you would expect to see in the amino acid side chains on the outer surface of an integral cell membrane protein, as compared to a water-soluble globular protein. Be sure to discuss the chemical nature of the cell membrane in your answer.arrow_forward
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