Catalyzes the formation of 5-(aminomethyl)-3-furanmethanol diphosphate (F1-PP) from 5-(aminomethyl)-3-furanmethanol phosphate (F1-P) and ATP (PubMed:26100040). In vitro, can also act as an adenylate kinase that catalyzes the transfer of a phosphoryl group from ATP to AMP, generating two molecules of ADP (PubMed:22002406). [5-(aminomethyl)-3-furyl]methyl phosphate + ATP = [5-(aminomethyl)furan-3-yl]methyl diphosphate + ADP Inhibited by EDTA. Optimum pH is 7.0. Cofactor biosynthesis; methanofuran biosynthesis. Homotrimer. Belongs to the MfnE family.