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Proc Natl Acad Sci U S A. 2003 Oct 28;100(22):12648-53. Epub 2003 Oct 17.

Structure of tRNA pseudouridine synthase TruB and its RNA complex: RNA recognition through a combination of rigid docking and induced fit.

Author information

1
Department of Biophysics and Biochemistry, University of California, San Francisco, CA 94143, USA.

Abstract

RNA pseudouridine synthase, TruB, catalyzes pseudouridine formation at U55 in tRNA. This posttranscriptional modification is almost universally conserved and occurs in the T arm of most tRNAs. We determined the crystal structure of Escherichia coli TruB apo enzyme, as well as the structure of Thermotoga maritima TruB in complex with RNA. Comparison of the RNA-free and -bound forms of TruB reveals that this enzyme undergoes significant conformational changes on binding to its substrate. These conformational changes include the ordering of the "thumb loop," which binds right into the RNA hairpin loop, and a 10 degree hinge movement of the C-terminal domain. Along with the result of docking experiments performed on apo TruB, we conclude that TruB recognizes its RNA substrate through a combination of rigid docking and induced fit, with TruB first rigidly binding to its target and then maximizing the interaction by induced fit.

PMID:
14566049
PMCID:
PMC240672
DOI:
10.1073/pnas.2135585100
[Indexed for MEDLINE]
Free PMC Article

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