2.1.1.64	membrane	associated. In vivo, the methyltransferase reaction probably occurs at the internal surface of the cytoplasmic membrane	
2.1.1.64	membrane	the membrane-binding region of UbiG gates the entrance of methyl donor	
2.1.1.64	mitochondrion	-	
2.1.1.64	mitochondrion	the Coq3 polypeptide is peripherally associated with the matrix side of the inner membrane of yeast mitochondria