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http://www.usm.maine.edu/~rhodes/BiochemViews/LipMemb/
University of Southern Maine. Here are very good molecular visualizations of membrane molecules. This site explains the function and motion of the bilipid membrane and includes both an idealized and "real" views. Membrane enzyme examples and functions are included. Also look at some examples of membrane proteins including OmpF Porin from E. coli for an example of a mitochondrial and chloroplast membrane protein not present in cell membranes. It examines the structures that produce nutrients. Another is Gramicidin in Lipid Bilayer that illustrates an ionophore protein embebbed in the plasma membrane.
http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/carriers.htm
This useful websites has more illustrations that enhance and expand on the Rhodes-U of So. Maine site. Carriers, pumps and channels are shown as a page of cartoons with several chime files including Lactose Permease, a carrier protein. "Proteins that act as carriers are too large to move across the membrane. ... Uniport (facilitated diffusion) carriers mediate transport of a single solute. ..."
http://bmbiris.bmb.uga.edu/wschmidt/BCMB8020files/8020_lectures_13-16.pdf
powerpoint about ion/small molecule transportFacilitated Diffusion = Facilitated / Mediated / Passive Transport. (passive transporters ... 15-30% of membrane proteins are devoted to transport ! ...
http://www.bioinformatics.iastate.edu/BBSI/lecture_notes_2005/BBSI05-F3-F4.Jernigan.Ref.pdf
This a powerpoint on protein mechanisms. It includes function reference by which ABC transporter protein binds the small molecule solute and an illustration of Oxygen binding to Hb facilitated by a heme group within the protein.
http://campus.queens.edu/faculty/jannr/molecular/
molecular biology links
http://www.rpi.edu/dept/bcbp/
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