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Welcome to EXPRESSYS

EXPRESSYS offers tools and reagents for gene expression in prokaryotic hosts based on the pZ expression system developed by
Dr. Rolf Lutz and Prof. Hermann Bujard (
Lutz & Bujard, 1997).

The system consists of the following components:

1. VECTORS for cloning and expression

A versatile vector system of modular structure offers freely interchangeable functional units:

• 5 tightly and independently controllable promoters

• 5 different selection markers

• 4 origins of replication

• 2 cloning sites


Various host strains provide chromosomally encoded regulatory proteins in defined concentrations warranting tight repression, full inducibility and genetic stability under all conditions of growth.

last update: Sep 2015