Amplification of protein expression in a cell free system

Edgard Resto, Akira Lida, Mark D.van Cleve, Sidney M. Hecht

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Large quantities of a catalytically active protein have been produced in a cell free system. More than 109 copies of protein were produced from each DNA plasmid containing DNAfo/i the bacterial gene encoding dihydrofolate reductase (DHFR). The strategy employed, denoted gene amplification with transcription/translation (GATT), involves sequential coupling of (i) DNA amplification by the polymerase chain reaction (PCR) and (ii) in vitro RNA transcription by T7 RNA polymerase, followed by (iii) translation of the run-off transcripts in a rabbit reticulocyte system. The protein product had the expected size (18 kDa) and catalyzed the NADPH-dependent reduction of 7,8-dihydrofolic acid to 5,6,7,8-tetrahydrofolic acid as efficiently as authentic DHFR. Potential applications of the strategy include large scale production of enzymes containing synthetic amino acids and facilitation of the characterization of the function of genes encountered in genomic mapping studies.

Original languageEnglish (US)
Pages (from-to)5979-5983
Number of pages5
JournalNucleic acids research
Issue number22
StatePublished - Nov 25 1992
Externally publishedYes

ASJC Scopus subject areas

  • Genetics


Dive into the research topics of 'Amplification of protein expression in a cell free system'. Together they form a unique fingerprint.

Cite this