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Author Topic:   Disadvantageous Mutations: Figures
caffeine
Member (Idle past 1051 days)
Posts: 1800
From: Prague, Czech Republic
Joined: 10-22-2008


Message 74 of 93 (801478)
03-06-2017 2:32 PM
Reply to: Message 63 by New Cat's Eye
02-27-2017 5:25 PM


That's what I said. But the calculation of a protein forming from the space of all proteins assumes they do randomly come together and join mechanically, so the calculation is the wrong one.
That does not appear to be the calculation that Axe was doing. What he did* was take a specific protein (not the naturally occuring sequence, but one intentionally selected to be sensitive to mutation) and then subjected it to random mutation to see how many possible changes led to a functional protein (his conclusion - few). He then extrapolated from this that the probability of any protein performing a specific function was as low as 1 in 10^77.
Note that the probability of finding a protein which performs a specific function is of course a very different calculation than the probability of finding a protein with a function.
*with the caveat that this is what I understand he did - I am a little out of my depth.

This message is a reply to:
 Message 63 by New Cat's Eye, posted 02-27-2017 5:25 PM New Cat's Eye has replied

Replies to this message:
 Message 75 by New Cat's Eye, posted 03-06-2017 3:05 PM caffeine has replied
 Message 76 by JonF, posted 03-06-2017 3:06 PM caffeine has replied

  
caffeine
Member (Idle past 1051 days)
Posts: 1800
From: Prague, Czech Republic
Joined: 10-22-2008


Message 77 of 93 (801547)
03-07-2017 1:53 PM
Reply to: Message 75 by New Cat's Eye
03-06-2017 3:05 PM


Got a link to the paper?
Behind a paywall. I read just the abstract and this article about the paper on Panda's Thumb. on Panda's Thumb.
Edited by caffeine, : tags

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caffeine
Member (Idle past 1051 days)
Posts: 1800
From: Prague, Czech Republic
Joined: 10-22-2008


Message 78 of 93 (801548)
03-07-2017 1:56 PM
Reply to: Message 76 by JonF
03-06-2017 3:06 PM


He did not see if the result was a functioning protein. He saw if the result carried out the original function. I suspect you know this and worded it slightly sloppily.
Yes, this is what I was trying to say - which is why his lowend probability estimate seems to be about the probability of a protein performing a specific function; rather than the probability of a protein with function.

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