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Competing protein:protein interactions. The structure of holo E. coli BirA is shown with one subunit in space filled mode and the other in blue ribbon [PDB 2EWN20]. The BCCP substrate bound to BirA (pink ribbon) has been modeled using the BPL:BCCP complex from P. horikoshii [PDB 2EJG32] with UCSF Chimera software.54
