A new system for the release of heterologous proteins from yeast based on mutant strains deficient in cell integrity.

Abstract:

:A system has been developed for the release of heterologous proteins from Saccharomyces cerevisiae, based on the use of thermosensitive osmotic-remedial mutants, deficient in cell integrity, that lyse at the non-permissive temperature, thus releasing the bulk of intracellular proteins and leaving behind cell ghosts and debris. The strains developed combine the lyt2 mutation (which is allelic to gene SLT2/MPK1 coding for a MAP kinase homolog), with the disruption of genes PEP4 and PRB1 known to produce a protease-deficient background. Cells transformed with the appropriate bacterial gene, released about 70% of the heterologous protein chloramphenicol acetyl transferase (CAT) in bioreactor cultivation upon switching growth temperature to 37 degrees C, or by osmotic shock of the cells preincubated at 37 degrees C in the presence of 1 M sorbitol. It is suggested that our release system could be advantageous for obtaining large-scale protein preparations for downstream processing without any mechanical breakage of the cells, enzymatic treatment or chemical extraction.

journal_name

J Biotechnol

journal_title

Journal of biotechnology

authors

Alvarez P,Sampedro M,Molina M,Nombela C

doi

10.1016/0168-1656(94)90149-x

subject

Has Abstract

pub_date

1994-11-30 00:00:00

pages

81-8

issue

1

eissn

0168-1656

issn

1873-4863

pii

0168-1656(94)90149-X

journal_volume

38

pub_type

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