The maximum OD600 of the IPTG-induced culture was only
0.72 and reached a plateau after induction for 5 h, while
the non-induced culture grew normally and reached a
plateau at OD600 at about 2.40. This result indicated that
the expressed Mtx1 might be toxic to the host cell. In
order to reduce the potential toxicity of the expressed
product, mtx1 gene was subcloned into pGEX-4T-1 in
such a way that the gene was fused in-frame to gst gene
in the vector.