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Nucleic Acids Research, 2001, Vol. 29, No. 15 e73
© 2001 Oxford University Press

Single step generation of protein arrays from DNA by cell-free expression and in situ immobilisation (PISA method)

Mingyue He* and Michael J. Taussig

Technology Research Group, The Babraham Institute, Babraham, Cambridge CB2 4AT, UK

We describe a format for production of protein arrays termed ‘protein in situ array’ (PISA). A PISA is rapidly generated in one step directly from PCR-generated DNA fragments by cell-free protein expression and in situ immobilisation at a surface. The template for expression is DNA encoding individual proteins or domains, which is produced by PCR using primers designed from information in DNA databases. Coupled transcription and translation is carried out on a surface to which the tagged protein adheres as soon as it is synthesised. Because proteins generated by cell-free synthesis are usually soluble and functional, this method can overcome problems of insolubility or degradation associated with bacterial expression of recombinant proteins. Moreover, the use of PCR-generated DNA enables rapid production of proteins or domains based on genome information alone and will be particularly useful where cloned material is not available. Here we show that human single-chain antibody fragments (three domain, VH/K form) and an enzyme (luciferase) can be functionally arrayed by the PISA method.

* To whom correspondence should be addressed. Tel: +44 1223 496249; Fax: +44 1223 496045; Email: mingyue.he{at}bbsrc.ac.uk


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