Transfer RNA (tRNA)
From Proteopedia
Frédéric Dardel (Talk | contribs)
(New page: <Structure load='1ehz' size='400' frame='true' align='right' caption='tRNA Phe' scene='Insert optional scene name here' /> tRNA or transfer RNA are stable, structured RNA that are presen...)
Next diff →
Revision as of 14:55, 8 January 2011
|
tRNA or transfer RNA are stable, structured RNA that are present in all living cells. They participate in the process of protein translation by the ribosome. tRNA carry a specific aminoacid esterified on their 3'-OH group (the acceptor end). They also carry a specific triplet sequence, the anticodon, which pairs with its complementary codon on the messenger RNA, within the ribosome.
Cells have usually have sets of tRNA corresponding to all 20 standard aminoacids, with anticodons capable of pairing with the 61 "sense" or coding codons. The secondary structure of tRNA is well conserved throughout evolution, with a classical cloverleaf fold comprising four stems. In three dimensions, tRNA adopt an "L" shape, with the acceptor end on one end and the anticodon on the other end.
After incorporation of the aminoacid into the nascent protein chain by the ribosome, tRNA need to be esterified again with their cognate aminoacid, a process which is catalysed by a family of enzymes called aminoacyl-tRNA synthetases.
Proteopedia Page Contributors and Editors (what is this?)
Karsten Theis, Wayne Decatur, Michal Harel, Frédéric Dardel, Ann Taylor, Joel L. Sussman, Alexander Berchansky
