Monomethyl Auristatin F (MMAF)
Monomethyl Auristatin F (MMAF)

Chemical Name: (S)-2-((2R,3R)-3-((S)-1-((3R,4S,5S)-4-((S)-N,3-dimethyl-2-((S)-3-methyl-2-(methylamino)butanamido)butanamido)-3-methoxy-5-methylheptanoyl)pyrrolidin-2-yl)-3-methoxy-2-methylpropanamido)-3-phenylpropanoic acid

Molecular Weight: 731.96
Formula: C39H65N5O8
CAS#: 141205-32-5
Solubility: DMSO up to 20 mM

Biological Activity
Monomethyl auristatin F (MMAF) is an antitubulin agent agent that inhibits cell division by blocking the polymerization of tubulin. It is a new auristatin derivative with a charged C-terminal phenylalanine that attenuates its cytotoxic activity compared to its uncharged counterpart, Monomethyl auristatin E (MMAE). [1, 2, 3, 4]


Because of MMAF is highly toxic, it cannot be used as a drug itself. MMAF induces potent antitumor effects when conjugated via protease cleavable linkers to a monoclonal antibody targeting internalizing, tumor-specific cell surface antigens. The linker to the monoclonal antibody is stable in extracellular fluid, but is cleaved by cathepsin once the conjugate has entered a tumor cell, thus activating the anti-mitotic mechanism. [4, 5]