The protein MGC3, is a 120-kDa membrane protein and a homologue of
130-kDa protein encoded by the ORF6 gene, which is a part of P1
operon of M. pneumoniae.
MGC3 protein encoded by the mgc3 gene may function as a
cytoadherence-associated molecule because the M. pneumoniae 130-kDa
protein has been implicated in the cellular adhesion process.