23S rRNA (adenine<sup>1618</sup>-N<sup>6</sup>)-methyltransferase (, rRNA large subunit methyltransferase F, YbiN protein, rlmF (gene), m6A1618 methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:23S rRNA (adenine<sup>1618</sup>-N<sup>6</sup>)-methyltransferase. This enzyme catalyses the following chemical reaction
The recombinant YbiN protein is able to methylate partially deproteinized 50S ribosomal subunit.