Antiporter
McGraw-Hill Science & Technology Dictionary:
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antiporter
(an·tē′pörd·ər)
(cell and molecular biology) A channel protein that simultaneously or sequentially transports two different types of substrates across a cell membrane, one into the cell (for example sodium ion) and one out of the cell (for example calcium ion).
Oxford Dictionary of Biochemistry:
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antiporter
any substance or structural feature, but usually a protein, that promotes the exchange diffusion of two specific substances across a membrane by antiport. The convention for denoting such a protein (e.g. a tetracycline-resistance protein) is tetracycline/H+ antiporter.
| antiport, antiphospholipid antibodies, antipernicious anemia factor | |
| antirachitic, antirachitic factor, antirepressor |
Wikipedia on Answers.com:
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Antiporter
An antiporter (also called exchanger or counter-transporter) is an integral membrane protein involved in secondary active transport of two or more different molecules or ions (i.e., solutes) across a phospholipid membrane such as the plasma membrane in opposite directions.
In secondary active transport, one species of solute moves along its electrochemical gradient, allowing a different species to move against its own electrochemical gradient. This movement is in contrast to primary active transport, in which all solutes are moved against their concentration gradients, fueled by ATP.
Transport may involve one or more of each type of solute. For example, the Na+/Ca2+ exchanger, used by many cells to remove cytoplasmic calcium, exchanges one calcium ion for three sodium ions.
See also
External links
- antiport at eMedicine Dictionary
- MeSH Antiporters
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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Oxford Dictionary of Biochemistry
Oxford University Press. Oxford Dictionary of Biochemistry and Molecular Biology © 1997, 2000, 2006 All rights reserved.
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