Structure of the alpha-N-methyltransferase (SonM mutant Y58F) and RiPP precursor (SonA) heteromeric complex (no cofactor)

Conformational rearrangements enable iterative backbone N-methylation in RiPP biosynthesis.

MGSLVCVGTGLQLAGQISVLSRSYIEHADIVFSLLPDGFSQRWLTKLNPNVINLQQFFAQNGEVKNRRDTYEQMVNAILD
AVRAGKKTVCALYGHPGVFACVSHMAITRAKAEGFSAKMEPGISAEACLWADLGIDPGNSGHQSFEASQFMFFNHVPDPT
THLLLWQIAIAGEHTLTQFHTSSDRLQILVEQLNQWYPLDHEVVIYEAANLPIQAPRIERLPLANLPQAHLMPISTLLIP
PAKKLEYNYAILAKLGIGPEDLG

Proteins were concentrated at 20 mg/mL and crystallized at pH ranging between 5.5-7 and using PEG 3,350 (0-20%) as precipitant

National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

7LTC contains the wild type complex in the absence of SAH

7LTE contains the wild type complex in the presence of SAH

posttranslational modifications; ribosomally synthesized and posttranslationally modified peptides; alpha-N-methyltransferase; borosin; SAM, TRANSFERASE

MGSLVCVGTGLQLAGQISVLSRSYIEHADIVFSLLPDGFSQRWLTKLNPNVINLQQFYAQNGEVKNRRDTYEQMVNAILD
AVRAGKKTVCALYGHPGVFACVSHMAITRAKAEGFSAKMEPGISAEACLWADLGIDPGNSGHQSFEASQFMFFNHVPDPT
THLLLWQIAIAGEHTLTQFHTSSDRLQILVEQLNQWYPLDHEVVIYEAANLPIQAPRIERLPLANLPQAHLMPISTLLIP
PAKKLEYNYAILAKLGIGPEDLG