1lfu
From Proteopedia
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NMR Solution Stucture of the Extended PBX Homeodomain Bound to DNA
Overview
HOX homeodomain proteins bind short core DNA sequences to control very, specific developmental processes. DNA binding affinity and sequence, selectivity are increased by the formation of cooperative complexes with, the PBX homeodomain protein. A conserved YPWM motif in the HOX protein is, necessary for cooperative binding with PBX. We have determined the, structure of a PBX homeodomain bound to a 14-mer DNA duplex. A, relaxation-optimized procedure was developed to measure DNA residual, dipolar couplings at natural abundance in the 20-kDa binary complex. When, the PBX homeodomain binds to DNA, a fourth alpha-helix is formed in the, homeodomain. This helix rigidifies the DNA recognition helix of PBX and, forms a hydrophobic binding site for the HOX YPWM peptide. The HOX peptide, itself shows some structure in solution and suggests that the interaction, between PBX and HOX is an example of "lock and key" binding. The NMR, structure explains the requirement of DNA for the PBX-HOX interaction and, the increased affinity of DNA binding.
About this Structure
1LFU is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.
Reference
Lock and key binding of the HOX YPWM peptide to the PBX homeodomain., Sprules T, Green N, Featherstone M, Gehring K, J Biol Chem. 2003 Jan 10;278(2):1053-8. Epub 2002 Oct 29. PMID:12409300
Page seeded by OCA on Tue Nov 20 20:32:16 2007
