Structure of myostatin in complex with chimeric RK35 antibody

Beyond CDR-grafting: Structure-guided humanization of framework and CDR regions of an anti-myostatin antibody.

EVQLVESGGGLVKPGGSLKLSCAASGFTFSSYAMSWVRQTPEKRLEWVATISSGGSYTSYPDSVKGRFTISRDNAKNTLY
LQMSSLRSEDTAMYYCARQDYAMNYWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSG
ALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCDK

DIEMTQSHKFMSTSVGDRVSITCKASQDVSTAVAWYQQKPGQSPKLLLYSASYRYTGVPDRFTGSGSGTDFTFTISSVNA
EDLAVYYCQQHYSTPWTFGGGTKVEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQ
ESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGE

DFGLDCDEHSTESRCCRYPLTVDFEAFGWDWIIAPKRYKANYCSGECEFVFLQKYPHTHLVHQANPRGSAGPCCTPTKMS
PINMLYFNGKEQIIYGKIPAMVVDRCGCS

Chimeric RK35 Fab and myostatin were purified and the protein complex was concentrated to 10.75 mg/ml in a buffer of 50 mM tris hydrochloride pH 7.5 and 100 mM sodium chloride. Crystals were obtained using the hanging drop method with equilibration at 18C against a solution containing 20% PEG MME 5000 and 100 mM bis-tris pH 6.5

Myostatin exists a dimer and one Fab (heavy/light chain pair) binds to each myostatin, so 6 polymers total.

myostatin, antibody, complex, Signaling Protein-Immune System complex