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Background  PhaR which is a repressor protein for microbial polyhydroxyalkanoates (PHA) biosynthesis, is able to attach to bacterial PHA granules  in vivo , was developed as an affinity tag for  in vitro  protein purification. Fusion of PhaR-tagged self-cleavable Ssp DnaB intein to the N-terminus of a target protein allowed protein purification with a pH and temperature shift. During the process, the target protein was released to the supernatant while PhaR-tagged intein was still immobilized on the PHA nanoparticles which were then separated by centrifugation.    Results  Fusion protein PhaR-intein-target protein was expressed in recombinant  Escherichia coli . The cell lysates after sonication and centrifugation were collected and then incubated with PHA nanoparticles to allow sufficient absorption onto the PHA nanoparticles. After several washing processes, self-cleavage of intein was triggered by pH and temperature shift. As a result, the target protein was released from the particles and purified after centrifugation. As target proteins, enhanced green fluorescent protein (EGFP), maltose binding protein (MBP) and β-galactosidase (lacZ), were successfully purified using the PhaR based protein purification method.    Conclusion  The successful purification of EGFP, MBP and LacZ indicated the feasibility of this PhaR based  in vitro  purification system. Moreover, the elements used in this system can be easily obtained and prepared by users themselves, so they can set up a simple protein purification strategy by themselves according to the PhaR method, which provides another choice instead of expensive commercial protein purification systems.

Microbial polyhydroxyalkanote synthesis repression protein PhaR as an affinity tag for recombinant protein purification