In-house SAD Phasing with Surface-bound Cerium Ions

Overview

Journal Acta Crystallogr Sect F Struct Biol Cryst Commun

Date 2011 Dec 6

PMID 22139192

Citations 4

Authors

K Natesan Vennila

Devadasan Velmurugan

Affiliations

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Abstract

The anomalous signal of cerium(III) ions present in a derivative of hen egg-white lysozyme (HEWL) crystals obtained by the addition of 0.025 M cerium chloride to the crystallization medium was used for phasing. X-ray intensity data were collected to 2 Å resolution using an in-house Cu Kα radiation data-collection facility. Phasing of a single-wavelength data set purely based on its f'' led to a clearly interpretable electron-density map. Automated substructure solution by AutoSol in PHENIX resulted in four highest peaks corresponding to cerium(III) ions with data limited to 3 Å resolution, and about 90% of the residues were built automatically by AutoBuild in PHENIX. Cerium(III) ions bound on the surface of the enzyme are found to interact mainly with the main-chain and side-chain carbonyl groups of Asn, Glu, Tyr and Asp and with water molecules. Ce(3+) ions were used as potential anomalous scatterers for the in-house single-wavelength anomalous scattering technique, and this is proposed as a tool for macromolecular phasing and for the study of the interactions of trivalent metal ions with proteins and other macromolecules.

Citing Articles

Interaction of two imidazolium gemini surfactants with two model proteins BSA and HEWL.

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In-house zinc SAD phasing at Cu Kα edge.

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Use of europium ions for SAD phasing of lysozyme at the Cu Kα wavelength.

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Structure determination by multiple-wavelength anomalous dispersion (MAD) at the Pr LIII edge.

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