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. 1994 Sep 1;13(17):3953–3963. doi: 10.1002/j.1460-2075.1994.tb06711.x

Use of photoaffinity crosslinking and molecular modeling to analyze the global architecture of ribonuclease P RNA.

M E Harris 1, J M Nolan 1, A Malhotra 1, J W Brown 1, S C Harvey 1, N R Pace 1
PMCID: PMC395315  PMID: 7521297

Abstract

Bacterial ribonuclease P (RNase P), an endonuclease involved in tRNA maturation, is a ribonucleoprotein containing a catalytic RNA. The secondary structure of this ribozyme is well established, but comparatively little is understood about its 3-D structure. In this analysis, orientation and distance constraints between elements within the Escherichia coli RNase P RNA-pre-tRNA complex were determined by intra- and intermolecular crosslinking experiments. A molecular mechanics-based RNA structure refinement protocol was used to incorporate the distance constraints indicated by crosslinking, along with the known secondary structure of RNase P RNA and the tertiary structure of tRNA, into molecular models. Seven different structures that satisfy the constraints equally well were generated and compared by superposition to estimate helix positions and orientations. Manual refinement within the range of conformations indicated by the molecular mechanics analysis was used to derive a model of RNase P RNA with bound substrate pre-tRNA that is consistent with the crosslinking results and the available phylogenetic comparisons.

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