Membrane transport question

Michael Kolotila x3887 mkolotila at
Thu Sep 26 07:41:45 EST 1996

Hi Brian;
  Good question.  I am giving that lecture today, it is a bio course for
non-majors.  I seem to remember that in the kidney there is a transporter
that pumps Na, bicarb, in and protons out. It has been awhile since I
taught A&P.  Tortora's AP should help.  Good luck.

 Michael P. Kolotila, Ph.D.        * e-mail: mkolotila at   
 Biotechnology Program Coordinator *          
 Department of Natural Science     * phone     :  508-374-3887
 Northern Essex Community College  * voice mail:  508-374-3644
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 Haverhill, MA  01830-2399         *              508-374-3729
       "A little caffeine is good for the soul."  --David Hamburger          

On Wed, 25 Sep 1996, Brian T. Greuel wrote:

> As I was lecturing about membrane transport in my Cell Biology class today, I 
> realized that I couldn't present a single specific example of primary active 
> transport (i.e. hydrolyzes ATP) that utilizes a symport mechanism to transport 
> two substances across a membrane.  There are, of course, several examples of 
> secondary active transport that use gradients of Na+ or H+ to transport other 
> molecules or ions against their concentration gradient by a symport mechanism.  
> But are there examples of symports that pump two substances across the 
> membrane in the same direction using the energy of ATP hydrolysis?  I can't 
> think of any.  Might some of the ABC transporters fall into this category?
> As for antiporters involved in primary active transport, the only one I know 
> about is the Na+/K+ ATPase.  Are there others?
> Thanks in advance for your help.
> Brian T. Greuel
> Dept. of Biology
> University of Scranton
> Scranton, PA  18510-4625
> email:  greuelb1 at

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