the growing polypeptide can be found at which site

[blackmi4]

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During translation the growing poypeptide can be found attached to a tRNA at which site on the ribosome.

Why do people say the P site? Wouldn't it be both the A and the P since the polypeptide attaches to the amino acid that is on the tRNA that is at the A SITE -- BEFORE the ribosome moves in the 3' direction so that that tRNA is now at the P site.

A couple animations showing what I'm talking about:

http://www.youtube.com/watch?v=5bLEDd-PSTQ

http://www.johnkyrk.com/DNAtranslation.html

Thanks!

 

[KDVMSPH]

Hey!

The ribosome is made A- P- E order 🙂
Easy to remember

 

[Lifeman]

I think its just one of those things that are convention. Just remember "P" site for "P"olypeptide site.