Types | DnaRegion
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Roles | tag
Tag
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Sequences | BBa_K1503000_sequence (Version 1)
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Description
This degradation-tag, in short D-tag, is a short part of the cyclin Clb3. It is the sequence for the amino acids of the N-terminal until and including a destruction box, a nine amino acid recognition site with the sequence R-x-x-L-x-x-x-x-N. This sequence is necessary but not sufficient for a specific ubiqitin-mediated degradation and to be found in most of the B-cyclins of yeast.
Cyclins bind to cell cycle specific kinases and mediate thereby the progress of the different steps of the cell cycle. The six B-cyclins in yeast (Clb1-6) are responsible for the transition into S- and M-Phase of the cell cycle. With increasing digit the degradation occours later in the cell cycle. This goes hand in hand with the position of the destruction box in the protein, which distance to the N-terminal increases with the digit as well.
Notes
Because of the short length of the fragment the purification is harder, since it has the same size as pollutants might have.
Source
The gene for the Clb3 protein is to be found in the genome of S. cerevisiae.