Nature. 2005 Mar 10;434(7030):183-91.

Structural basis of HutP-mediated anti-termination and roles of the Mg2+ ion and L-histidine ligand.

Source

Functional Nucleic Acids Group, Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.

Abstract

HutP regulates the expression of the hut structural genes of Bacillus subtilis by an anti-termination mechanism and requires two components, Mg2+ ions and L-histidine. HutP recognizes three UAG triplet units, separated by four non-conserved nucleotides on the terminator region. Here we report the 1.60-A resolution crystal structure of the quaternary complex (HutP-L-histidine-Mg2+-21-base single-stranded RNA). In the complex, the RNA adopts a novel triangular fold on the hexameric surface of HutP, without any base-pairing, and binds to the protein mostly by specific protein-base interactions. The structure explains how the HutP and RNA interactions are regulated critically by the l-histidine and Mg2+ ion through the structural rearrangement. To gain insights into these structural rearrangements, we solved two additional crystal structures (uncomplexed HutP and HutP-L-histidine-Mg2+) that revealed the intermediate structures of HutP (before forming an active structure) and the importance of the Mg2+ ion interactions in the complexes.

PMID:: 15758992; [PubMed - indexed for MEDLINE]

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Cited by 7 PubMed Central articles

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Structures reported by this article

Crystal Structure Of The Hutp Antitermination Complex Bound To The Hut Mrna

PDB: 3BOY

Source: Bacillus subtilis, synthetic construct

Method: X-Ray Diffraction

Resolution: 1.7 Å

See all 7 structures...

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