NDLI: Lanthanide-binding helix-turn-helix peptides: solution structure of a designed metallonuclease.

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Lanthanide-binding helix-turn-helix peptides: solution structure of a designed metallonuclease.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kearney, William R. Welch, Joel T. Franklin, Sonya J.
Description	Author Affiliation: Welch JT ( Department of Chemistry and College of Medicine NMR Facility, University of Iowa, Iowa City, IA 52242, USA.);
Abstract	A designed lanthanide-binding chimeric peptide based on the strikingly similar geometries of the EF-hand and helix-turn-helix (HTH) motifs was investigated by NMR and CD spectroscopy and found to retain the same overall solution structure of the parental motifs. CD spectroscopy showed that the 33-mer peptide P3W folds on binding lanthanides, with an increase in alpha-helicity from 20% in the absence of metal to 38% and 35% in the presence of excess Eu(III) and La(III) ions, respectively. The conditional binding affinities of P3W for La(III) (5.9 +/- 0.3 microM) and for Eu(III) (6.2 +/- 0.3 microM) (pH 7.8, 5 mM Tris) were determined by tryptophan fluorescence titration. The La(III) complex of peptide P3, which differs from P3W by only one Trp-to-His substitution, has much less signal dispersion in the proton NMR spectra than LaP3W, indicating that the Trp residue is a critical hydrophobic anchor for maintaining a well-folded helix-turn-helix structure. A chemical-shift index analysis indicates the metallopeptide has a helix-loop-helix secondary structure. A structure calculated by using nuclear Overhauser effect and other NMR constraints reveals that P3W not only has a tightly folded metal-binding loop but also retains the alpha-alpha corner supersecondary structure of the parental motifs. Although the solution structure is undefined at both the N and C termini, the NMR structure confirms the successful incorporation of a metal-binding loop into a HTH sequence.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	7
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Esterases Chemistry Lanthanoid Series Elements Metalloproteins Peptides Amino Acid Sequence Binding Sites Circular Dichroism Helix-Turn-Helix Motifs Kinetics Magnetic Resonance Spectroscopy Molecular Sequence Data Chemical Synthesis Protein Conformation Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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