Difference between revisions of "Assembly:Standard assembly"

Revision as of 15:41, 7 August 2006

Two BioBrick parts, one blue and one green can be assembled into a blue-green system by a process called BioBrick Standard Assembly, illustrated to the left.

The DNA sequence for a BioBrick part is always located in the middle of the BioBrick cloning site, between EcoRI and XbaI on the left and SpeI and PstI on the right. For the assembly shown, The blue part is cut out of its plasmid with the enzymes EcoRI and SpeI. The result is called the insert because it will be inserted into the plasmid containing the other part.

In a separate reaction, a hole is cut in the plasmid containing the green part using EcoRI and XbaI. Using gel electrophoresis, the insert for the blue part and the cut plasmid containing the green part are purified and the unwanted fragments discarded. The purified insert and cut plasmid are mixed under the right conditions to allow the E sticky ends to come together and the S sticky ends to come together with the X sticky ends. Once this happens, the DNA backbone is re-ligated, the resulting blue.green part transformed into E.coli cells. These cells may be grown to produce as much of blue.green part as desired.

Each cycle of BioBrick assembly joins two parts together and takes a couple days to a week to perform. Sometimes, the assembly process fails to produce the right assembly or even to produce anything. Sometimes, the result is not stable in E.coli and is rejected or mutated by the cells.

An alternative to BioBrick Standard Assembly is [http://openwetware.org/wiki/Synthetic_Biology:BioBricks/3A_assembly Three Antibiotic (3A) Assembly].