Chapter 4.2.1 Large protein molecules contain more than one polypeptide chain.

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  1. What type of forces allow for the binding of proteins to each other to produces larger proteins?

    What is a binding site?

    Each polypeptide chain in such a protein is called a _________ subunit, and each subunit may contain more than one domain.

    What is a dimer (in cap protein)? How are they made and in what?
    Noncovalent bonds.

    Any region on a protein's surface that interacts with another molecule through sets of noncovalent bonds.


    • Two protein subunits.
    • They are made by two identical protein subunits having the same binding sites and binding to each other. they are found in bacterial cells.
  2. What is a type of protein that is formes as a symmetrical assembly of two different subunits?

    What does it have?

    What do they do and how many?

    How are they arranged?

    What is this an example of?

    Two alpha globin and two copies of beta globin.

    Carry oxygen and they carry four.


    Large protein molecules often have more than one polypeptide chain.
  3. Proteins can assemble into what three things?

    How can a chain of identical protein molecules form?

    Why do the proteins end up arranging in a helix? What does that result in?

    What is an actin filament composed of?

    What do the other identical attached subunits form?
    Filaments, sheets, or spheres.

    By the binding site on one protein molecule being complementary to another region on the surface of another protein molecule of the same type.

    Because each protein molecule is bound to its neighbor in an identical way and can extend indefineitely in either direction. Forming an extended protein filament such as actin.

    Identical protein subunits.

    Other sets of identical proteins associate to form tubes, microtubules of the cytoskeleton.
  4. Enzymes or quatrinary proteins tend to be what kind of proteins?

    Some proteins have roles in the cell that requires them to span a large distance having an elongated 3-D structure and are commonly referred to as _______________.

    An example of fibrous proteins? 

    What is an alpha-keratin?

    Fibrous proteins.


    A dimer of two identical subunits, with the long alpha helices of each subunit forming a coiled-coil having their ends capped by globular domains with binding sites allowing them to turn into the intermediate filaments.
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Chapter 4.2.1 Large protein molecules contain more than one polypeptide chain.
2014-10-14 08:36:44
chapter 4.2.1
Large protein molecules contain more than one polypeptide chain.
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