What are the two mechanisms of facilitated passive transport?
carrier mediated and pore mediated.
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What are ionophores?
Small antibiotic peptides produced by certain bacteria. Can dissolve in membranes and catalyze transport of cations. are used as models for facilitated passive transport
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What does valinomycin do?
Increase permeability of K+ ions, Is a cyclic peptide with folded conformation. Surface rich in hydrophobic CH3 groups, interior ring of N and O
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What is gramicidin A?
A cation specific pore. Causes normal distribution of K+ and Na+ between environment and cell interior to break down.
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How do glucose transporters work?
Solute must bind in a gated mechanism causing a conformational change that is required to move the solute through the protein. 3-OH binds to the exterior and 6-OH binds to the interior.
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What does active transport require?
a pore, selective gate and a motor.
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Other cards in this set
Card 2
Front
What are ionophores?
Back
Small antibiotic peptides produced by certain bacteria. Can dissolve in membranes and catalyze transport of cations. are used as models for facilitated passive transport
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