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The hemA gene encoding 5-aminolevulinate synthase (ALAS) from Agrobacterium radiobacter zju-0121 showed 92.6% homology with that from A. radiobacter ATCC4718 and contained several rare codons. To enhance the expression of this gene, Escherichia coli Rosetta(DE3), which is a rare codon optimizer strain, was used as the host to construct an efficient recombinant strain. And the encoded protein was over-expressed...
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