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The exciting promises of functional metagenomics for the efficient discovery of novel biomolecules from nature are often hindered by factors associated with expression hosts. Aiming to shift functional metagenomics to a host independent innovative system, we here report on the cloning, heterologous expression, and reconstitution of an RNA polymerase (RNAP) from the thermophilic Geobacillus sp. GHH01...