Protein Movement and Cell Signaling

by Kevin Ahern, PhD

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    With the exception of encoding genetic information, proteins are either involved in, or perform essentially every important function of cells. In this lecture I’ll talk about protein functions as they relate to structure, communication and signaling, and movement. With proteins, there are very important considerations that we have with respect to their overall structure. Proteins are very important polymers of amino acids as we know, and one of the very interesting features of them is their flexibility. Flexibility allows proteins to be able to perform things like catalysis, amazingly efficiently, and other processes that allow them to adapt as we shall see. The geometry of proteins is important, and this is particularly important as we consider the geometry of the individual amino acids comprising proteins. Proteins can be either polar or nonpolar for the most part, and charged. Now these different polarities or charges as are considered help to determine where a protein is placed within a cell. And last, proteins can be a of a variety of forms, they can be fibrous, meaning that they have a fairly regular repeating fiber type structure. They can be globular, which indicates a folding that happens to make a protein have its final structure, and last, proteins can be involved in membranes as either fibers or as globular proteins. Now I’ll start talking here about the fibrous proteins. Fibrous proteins are very important in terms of things on our body. For example, the keratin proteins are proteins that comprise our hair and our nails. These fibrous proteins that I’ll talk about are very notable for being sturdy durable, and this we know our nails and talons that are on birds for example, are very, very tough materials. Collagen is a fibrous protein that is essentially the glue that holds us together. It...

    About the Lecture

    The lecture Protein Movement and Cell Signaling by Kevin Ahern, PhD is from the course Biochemistry: Basics. It contains the following chapters:

    • Structure of Proteins
    • Globular Structural Proteins
    • Communication & Signaling
    • Proteins Involved in Movement

    Included Quiz Questions

    1. ...commonly contain abundant glycine.
    2. ...derive most of their properties from their catalytic nature.
    3. ...have extensive tertiary structure.
    4. ...have almost random sequences.
    1. They work mostly outside of cells.
    2. Assembly/stability requires triphosphates.
    3. The group includes tubulin and actin.
    4. Are made up of monomeric polypeptide units.
    1. it involves hormones.
    2. signaling molecules enter cells through protein receptors.
    3. the term 7TM refers to a second messenger.
    4. the entire process occurs in the lipid bilayer.
    1. No energy is needed.
    2. Kinesin and Dynein “walk” on cellular filaments.
    3. It can occur on tubulin and actin.
    4. It is a factor in muscular contraction.

    Author of lecture Protein Movement and Cell Signaling

     Kevin Ahern, PhD

    Kevin Ahern, PhD

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