The pair will play their new track 'Read All About It' at the ceremony on October 5 at Glasgow's SECC.
The song is the first single proper to be lifted from Green's forthcoming album At Your Inconvenience, which is slated for an October 31 release.
MOBO nominee Dionne Bromfield will also pay tribute to her godmother, the late Amy Winehouse, at the music event.
The trio join a lineup which already includes performances from Katy B, Jessie J, Boyz II Men and Jason Derulo.
> MOBO Awards 2011: Nominations in full
Watch the music video for Professor Green and Emeli Sandé's new single 'Read All About It' below: