nezva Posted June 8, 2011 Share Posted June 8, 2011 Do all cellular membranes have transport proteins? I ask this question in an attempt to identify some of the evolutionary difficulties the "first cell" would've experienced. Link to comment Share on other sites More sharing options...
CharonY Posted June 8, 2011 Share Posted June 8, 2011 Do all cellular membranes have transport proteins? I ask this question in an attempt to identify some of the evolutionary difficulties the "first cell" would've experienced. I am not aware of any exceptions. Even if not actively growing, transport proteins would be required for energy conservation. One of the hall marks of living cells is their ability to create and maintain a proton gradient. For that membrane proteins are indispensable. 1 Link to comment Share on other sites More sharing options...
kellbrook Posted July 10, 2011 Share Posted July 10, 2011 so transport proteins specificthings they take in and out, is it possible for something that doesn't usually go in that way,if it was bonded to something that goes in that way Link to comment Share on other sites More sharing options...
CharonY Posted July 10, 2011 Share Posted July 10, 2011 Depends on the transport mechanism and the substrate to be transported. Some molecules are so similar that transport systems have trouble telling them apart, and some transport are somewhat promiscuous in what they transport. However, there is always a certain selectivity in there. Link to comment Share on other sites More sharing options...
kellbrook Posted July 11, 2011 Share Posted July 11, 2011 (edited) i guess my specific question is about magnesium ion uptake and cell transport proteins, magnesium ion is taken into the cell through the magnesium/ATPase pathway, but i want to know if magnesium was bonded to something like an amino acid, can this (magnesium+amino acid) be taken up together through the same pathway that amino acid normally use? charony i sent you pm but don't know if you got it, also how do i check to see if i recieved any pm? Edited July 11, 2011 by kellbrook Link to comment Share on other sites More sharing options...
CharonY Posted July 11, 2011 Share Posted July 11, 2011 (edited) I would not know how a Mg2+ would be bound to an amino acid. I do not know any examples, but theoretically it may be possible that during AA transport (probably especially for negatively charged one) Mg2+ may be accidentally transporter in. But again, I do know of any examples. If you chemically modify amino acids in a way, then it really depends on a) the specificity of the transporter and the impact of the modification of the overall structure of the ligand. But this has to be analysed on a case by case basis and involves serious modelling. Edited July 11, 2011 by CharonY Link to comment Share on other sites More sharing options...
Joshua201 Posted July 15, 2011 Share Posted July 15, 2011 proteins are needed for transport across a membrane Link to comment Share on other sites More sharing options...
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