Methods and compositions for synthesis of nucleic acid molecules using multiple recognition sites
The present invention provides compositions and methods for recombinational cloning. The compositions include vectors having multiple recombination sites and/or multiple topoisomerase recognition sites. The methods permit the simultaneous cloning of two or more different nucleic acid molecules. In some embodiments the molecules are fused together while in other embodiments the molecules are inserted into distinct sites in a vector. The invention also generally provides for linking or joining through recombination a number of molecules and/or compounds (e.g., chemical compounds, drugs, proteins or peptides, lipids, nucleic acids, carbohydrates, etc.) which may be the same or different. The invention also provides host cells comprising nucleic acid molecules of the invention or prepared according to the methods of the invention, and also provides kits comprising the compositions, host cells and nucleic acid molecules of the invention, which may be used to synthesize nucleic acid molecules according to the methods of the invention.
1. An isolated nucleic acid molecule comprising:
(a) a first topoisomerase recognition site;
(b) a first site specific recombination site;
(c) a nucleic acid segment;
(d) a second site specific recombination site; and
(e) a second topoisomerase recognition site;
wherein the first site specific recombination site and the second site specific site do not recombine with each other.
2. The nucleic acid molecule of claim 1 , wherein said nucleic acid molecule is a circular molecule.
3. The nucleic acid molecule of claim 1 , wherein said recombination sites are selected from the group consisting of:
(a) attB sites,
(b) attP sites,
(c) attL sites,
(d) attR sites,
(e) lox sites,
(f) psi sites,
(g) dif sites,
(h) cer sites,
(i) frt sites.
4. The nucleic acid molecule of claim 1 , wherein said topoisomerase recognition site is recognized and bound by a type I topoisomerase.
5. The nucleic acid molecule of claim 4 , wherein said type I topoisomerase is a type IE topoisomerase.
6. A kit comprising the isolated nucleic acid molecule of claim 1 .
7. The nucleic acid molecule of claim 1 , wherein the first topoisomerase recognition site and the first site specific recognition site are separated by from 0 to 100 nucleotides.