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Default Determination of the NMR solution structure of a specific DNA complex of the Myb DNA-

Determination of the NMR solution structure of a specific DNA complex of the Myb DNA-binding domain.

Related Articles Determination of the NMR solution structure of a specific DNA complex of the Myb DNA-binding domain.

J Biomol NMR. 1995 Nov;6(3):294-305

Authors: Morikawa S, Ogata K, Sekikawa A, Sarai A, Ishii S, Nishimura Y, Nakamura H

The solution structure of a specific DNA complex of the minimum DNA-binding domain of the mouse c-Myb protein was determined by distance geometry calculations using a set of 1732 nuclear Overhauser enhancement (NOE) distance restraints. In order to determine the complex structure independent of the initial guess, we have developed two different procedures for the docking calculation using simulated annealing in four-dimensional space (4D-SA). One is a multiple-step procedure, where the protein and the DNA were first constructed independently by 4D-SA using only the individual intramolecular NOE distance restraints. Here, the initial structure of the protein was a random coil and that of the DNA was a typical B-form duplex. Then, as the starting structure for the next docking procedure, the converged protein and DNA structures were placed in random molecular orientations, separated by 50 A. The two molecules were docked by 4D-SA utilizing all the restraints, including the additional 66 intermolecular distance restraints. The second procedure comprised a single step, in which a random-cell protein and a typical B-form DNA duplex were first placed 70 A from each other. Then, using all the intramolecular and intermolecular NOE distance restraints, the complex structure was constructed by 4D-SA. Both procedures yielded the converged complex structures with similar quality and structural divergence, but the multiple-step procedure has much better convergence power than the single-step procedure. A model study of the two procedures was performed to confirm the structural quality, depending upon the number of intermolecular distance restraints, using the X-ray structure of the engrailed homeodomain-DNA complex.

PMID: 8520221 [PubMed - indexed for MEDLINE]



Source: PubMed
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