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Why do G proteins such as Ras use GTP rather than ATP?

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Embryology

Welcome to the Embryology forum.

28-03-2008, 01:45 AM	#1 (permalink)
robertfw Junior Member Join Date: Mar 2008 Posts: 4	Why do G proteins such as Ras use GTP rather than ATP? Why is GTP used in cell signalling rather than ATP? I understand thatG proteins such as Ras use GTP in cell signalling. Is there a reason why they don't use ATP instead? Can anyone throw any light on this? Thanks very much indeed for taking the time to respond.

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