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

Discussion in 'Embryology' started by robertfw, Mar 27, 2008.

  1. robertfw

    robertfw New Member

    Mar 6, 2008
    Likes Received:
    Why is GTP used in cell signalling rather than ATP? :confused:

    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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