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2 Jan 2018

Which is not true of receptor proteins?

a. exhibit saturation, specificity, and competition

b. are always integral or transmembrane proteins

c. usually exist in families of related isoforms

d. are down-regulated by decreasing receptor number

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Related questions

1. Each transport protein recognizes, binds and transports only structurally distinct molecules.
a)saturation.
b)specificity
c)competition

2. when structurally similar molecules both bind to the same transport protein.
a) specificity
b)competition
c)saturation

3. the rate of movement of molecules across the membrane is limited by the number of available transport proteins.
a)competition
b)saturation
c)specificity

2. The receptor that binds the steroid hormone testosterone is located in the cytoplasm of its target cells. Vasopressin is a peptide hormone (nine amino acids long) that stimulates water reabsorption in the kidney. Its receptor is an integral protein in which the domain of the receptor responsible for binding vasopressin is located on the extracellular side of the cell membrane.

a) Why must the vasopressin-binding domain of the vasopressin receptor be located on the outside of a cell while the testosterone receptor can be located within a cell? Neither hormone binds to another molecule before it binds to its receptor. (If you are curious, the vasopressin sequence is Gly-Arg-Pro-Cys-Asn-Gln-Phe-Tyr-Cys รขย€ย“ you can look up those side chains if you want.)

b) What type or types of amino acids do you expect to predominate in the vasopressin-binding domain of the vasopressin receptor? What type or types of amino acids do you expect to find the transmembrane region of the vasopressin receptor (this region has several alpha helices passing through the membrane)? Explain your reasoning.

c) Why are alpha-helices commonly found in the transmembrane region of integral proteins?

1. Which of the following is not true of rational drug design?

a) It involves analysis of drug and receptor structure

b) It is used to develop novel drugs for diseases in which aberrant receptors have been discovered

c) It aims to maximize drug-receptor affinity

d) It aims for low drug-receptor specificity

2. Which is not a way that cells can regulate drug-receptor interactions?

a) Down-regulation

b)Receptor mutation

c) Tachyphlaxis

d) Refractory periods

3. Which is not an example of a drug-receptor interaction?

a) Alteration of urine osmolarity by mannitol

b) Inhibition of kinase activity by imatinib
c)

Interaction between warfarin and vitamin K epoxide

d) Blockade of sodium channels by tetrodotoxin

4.

What is true regarding induced fit?

a)

Drugs can alter the shape of their receptors

b) Induced fit allows for extracellular signals to have intracellular effects

c) Induced fit explains changes in the active site of enzymes following drug binding

d) All of the above

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