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Index >> Membrane Transport >> Binding Protein Transport System

Binding Protein Transport System

	Binding Protein Transport System The bacterial has special transport problems arising from the presence of the cell wall and of the fluid filled periplasmic space between the inner and outer membranes of the cell. Binding proteins are present in the periplasmic space, and perhaps function in carrying the solute across the space. The solute is then donated to another transport receptor site at the surface of the inner membrane (plasma membrane).
Tissues of higher organisms have also yielded a few binding proteins, e.g. the calcium binding protein (MW 28,000) in the intestine of the chick. A soluble calcium binding glycoprotein has also been isolated from bovine liver mitochondria Bacterial binding proteins have a high solubility in water, and their molecular weights range from 25,000. 40,000. Cystine residues are practically absent in the proteins, indicating minimal cross linkage
Binding proteins are exceptionally resistant to heat and extremes of pH. This suggests that they can readily return to the effective binding conformation. The arabinose binding protein has been described as a 70A x 35A x 35A ellipsoid. It contains two globular domains separated by a cleft. The complete amino acid sequence of the protein has been determined.
The galactose binding protein is structurally similar to the arabinose-binding protein. Over a hundred different binding proteins have been isolated A sudden decrease in the osmotic concentration of the suspended liquid at low temperature (cold osmotic shock) damages the outer cell membrane, and releases the binding proteins from the periplasmic space
	About 40% of the transport systems of E. coli, including those transporting ions, sugars, amino acids and vitamins, are included in the binding protein transport system. These systems utilize ATP or a related compound to drive active transport

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