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: https://doi.org/10.1038/srep03643
- Primary Citation of Related Structures:
- 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 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] Leeds Institute of Molecular Medicine Wellcome Trust Brenner Building St. James's University Hospital University of Leeds Leeds, LS9 7TF, UK  .