Catalyzes the deamination of aminodeoxyfutalosine (AFL) into futalosine (FL). To a lesser extent, can also deaminate 5'-deoxyadenosine, 5'-methylthioadenosine, 2'-deoxyadenosine, adenosine, 1-(6-amino-9H-purin-9-yl)-1-deoxy-N-ethyl-beta-D-ribofuranuronamide (NECA), and S-adenosylhomocysteine. 6-amino-6-deoxyfutalosine + H(+) + H2O = futalosine + NH4(+) Binds 1 zinc ion per subunit. kcat is 8.6 sec(-1) with aminodeoxyfutalosine as substrate. kcat is 0.72 sec(-1) with 2'-deoxyadenosine as substrate. Quinol/quinone metabolism; menaquinone biosynthesis. Belongs to the metallo-dependent hydrolases superfamily.