Conformational flexibility of the oncogenic protein LMO2 primes the formation of the multi-protein transcription complex.Sewell, H., Tanaka, T., Omari, K.E., Mancini, E.J., Cruz, A., Fernandez-Fuentes, N., Chambers, J., Rabbitts, T.H.
(2014) Sci Rep 4: 3643-3643
- PubMed: 24407558
- DOI: 10.1038/srep03643
- PubMed Abstract:
LMO2 was discovered via chromosomal translocations in T-cell leukaemia and shown normally to be essential for haematopoiesis. LMO2 is made up of two LIM only domains (thus it is a LIM-only protein) and forms a bridge in a multi-protein complex. We ha ...
LMO2 was discovered via chromosomal translocations in T-cell leukaemia and shown normally to be essential for haematopoiesis. LMO2 is made up of two LIM only domains (thus it is a LIM-only protein) and forms a bridge in a multi-protein complex. We have studied the mechanism of formation of this complex using a single domain antibody fragment that inhibits LMO2 by sequestering it in a non-functional form. The crystal structure of LMO2 with this antibody fragment has been solved revealing a conformational difference in the positioning and angle between the two LIM domains compared with its normal binding. This contortion occurs by bending at a central helical region of LMO2. This is a unique mechanism for inhibiting an intracellular protein function and the structural contusion implies a model in which newly synthesized, intrinsically disordered LMO2 binds to a partner protein nucleating further interactions and suggests approaches for therapeutic targeting of LMO2.
1] Weatherall Institute of Molecular Medicine MRC Molecular Haematology Unit University of Oxford John Radcliffe Hospital Oxford OX3 9DS, UK  Leeds Institute of Molecular Medicine Wellcome Trust Brenner Building St. James's University Hospital University of Leeds Leeds, LS9 7TF, UK  .