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Alpha complementation in the Cre recombinase enzyme.

Emilio Casanova¹, Thomas Lemberger, Sandra Fehsenfeld

¹Deutsches Krebsforschungszentrum (DKFZ), Heidelberg, Germany.

Genesis (New York, N.Y. : 2000)

|September 23, 2003

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Researchers developed a novel Cre-loxP system for gene inactivation. By splitting Cre recombinase into two inactive parts that reassemble upon coexpression, they achieved selective gene targeting with high specificity.

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

The Cre-loxP system is a powerful tool for gene manipulation.
Controlling Cre recombinase activity spatially and temporally remains a challenge.

Purpose of the Study:

To develop a novel method for selective gene inactivation using a modified Cre-loxP system.
To engineer Cre recombinase activity through protein complementation.

Main Methods:

Divided Cre recombinase into two non-functional polypeptide fragments (N-terminal 'alpha' and C-terminal 'beta').
Coexpressed the two fragments to assess their ability to reconstitute Cre activity.
Measured enzymatic activity of the reconstituted Cre recombinase in vitro.

Main Results:

Related Experiment Videos

Individual polypeptide fragments showed no detectable Cre recombinase activity.
Coexpression of the two fragments restored Cre enzymatic activity.
The reconstituted Cre activity reached up to 30% of wild-type Cre recombinase activity in vitro.

Conclusions:

The split Cre recombinase system enables selective gene inactivation.
This modified Cre-loxP system offers a strategy for highly specific recombination patterns.
Controlling the expression of separate Cre fragments allows for precise spatiotemporal gene targeting.