Heterologous expression of mycobacterial Esx complexes in Escherichia coli for structural studies is facilitated by the use of maltose binding protein fusions. gan Mark A Arbing, Sum Chan, Liam Harris, Emmeline Kuo, Tina T Zhou, Christine J Ahn, Lin Nguyen, Qixin He, Jamie Lu, Phuong T Menchavez, Annie Shin, Thomas Holton, Michael R Sawaya, Duilio Cascio, David Eisenberg