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Silver Bullets
Silver Bullets

Silver Bullets
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Silver Bullets
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Applications
Additive screen for the optimization of protein crystals
For use with soluble proteins and membrane proteins
Additive screen to discover different crystal forms
Secondary or orthogonal crystallization screen when traditional screens are not successful
Additive screen for the optimization of protein solubility and stability
Features
Developed at Hampton Research
Screens a portfolio of small molecules and excipients for their ability to establish stabilizing, intermolecular, hydrogen bonding, hydrophobic and electrostatic interactions which could promote lattice formation and crystallization
Small organic acids & organic salts
Biologically active small molecules
Amino acids & peptides
Macromolecular digests
Co-factors & ligands
Biochemical pathway intermediates
Nucleotides, pharmacaphores & carbohydrates
Description
Silver Bullets screens a portfolio of small molecules for their ability to establish stabilizing, inter molecular, hydrogen bonding, hydrophobic and electrostatic interactions which could promote stability, lattice formation, and crystallization.1-3

Published results with the Silver Bullets have been very encouraging, with more than twice as many proteins being crystallized overall as were crystallized from controls free of any small molecules.1-3

X-ray diffraction analysis has revealed the small molecule Silver Bullets in the crystal lattice, involved at the centers of hydrogen bonding networks and electrostatic interaction.1-3 Silver Bullets is compatible with hanging, sitting and sandwich drop vapor diffusion, microbatch, free interface, and microdialysis crystallization methods. Silver Bullets can be used with Dynamic Light Scattering (DLS), ThermoFluor, and Size Exclusion Chromatography assays.

Silver Bullets reagent portfolio
•Organic salts and acids
•Biologically active small molecules
•Amino acids and peptides
•Macromolecular digests

The Silver Bullets kit is a library of small molecules that have been shown to promote crystal lattice formation. X-ray diffraction analysis has demonstrated the reagents have the ability to:

•Stabilize the conformation of the protein
•Perturb the interaction of the protein with the solvent
•Participate in forming important lattice contacts
•Build the crystal lattice by forming reversible cross-links between the macromolecules in the crystal

The Silver Bullets kit is composed of 96 solutions in a single Deep Well block (Greiner 786261 block specifications: Total Volume: 0.5 mL Working Volume: 0.03 - 0.7 mL at Room Temperature 0.03 - 0.55 mL at -20ºC, Well Profile: Conical (V), Bottom Well Bottom: Solid, Plate Color: Translucent), HT format.

Each Silver Bullets reagent is a mixture of small molecules or macromolecular digests in 0.02 M HEPES sodium pH 6.8 buffer. Each solution contains between 2 and 20 small molecules.

Silver Bullets reagent volume is 0.5 ml (each well).

ThermoFluor is a registered trademark of Johnson & Johnson.
CAT NO NAME DESCRIPTION
HR2-096 Silver Bullets 0.5 ml, Deep Well block format
Price Quantity
$512.00
References
1.Searching for silver bullets: An alternative strategy for crystallizing macromolecules. Alexander McPherson and Bob Cudney. Journal of Structural Biology 156 (2006) 387-406.
2.A novel strategy for the crystallization of proteins: X-ray diffraction validation. Steven B. Larson, John S. Day, Robert Cudney, and Alexander McPherson. Acta Cryst. (2007) D63, 310-318.
3.A new crystal form of bovine pancreatic RNase A in complex with 2'-deoxyguanosine-5'-monophosphate. S. B. Larson, J. S. Day, R. Cudney and A. McPherson. Acta Cryst. (2007). F63, 728-733.
4.Development of an alternative approach to protein crystallization. McPherson, Alexander; Nguyen, Chieniang; Larson, Steven B; Day, John S; Cudney, Bob. J Struct Funct Genomics, Volume 8, Number 4, December 2007, 193-198.
5.Progress in the Development of an Alternative Approach to Macromolecular Crystallization. S. B. Larson,J. S. Day, C. Nguyen, R. Cudney, and A. McPherson. Crystal Growth & Design 2008 Volume 8, No. 8 3038-3052.
6.High-resolution structure of proteinase K cocrystallized with digalacturonic acid. S. B. Larson, J. S. Day, C. Nguyen, R. Cudney and A. McPherson. Acta Cryst. (2009). F65, 192-198.
7.Structure of pig heart citrate synthase at 1.78 Angstrom resolution. Steven B. Larson, John S. Day, Chieugiang Nguyen, Robert Cudney and Alexander McPherson. Acta Cryst. (2009). F65, 430–434.
8.Crystallization and preliminary X-ray diffraction analysis of the dimerization domain of the tumour suppressor ING4. Simone Culurgioni et al, Acta Cryst. (2010). F66, 567–570.
9.Crystallization and preliminary X-ray analysis of the chemokine-binding protein from orf virus (Poxviridae). R. M. Couñago, S. B. Fleming, A. A. Mercer and K. L. Krause. Acta Cryst. (2010). F66, 819-823. Synopsis: The morphology and diffraction behaviour of these crystals was significantly improved through the use of Silver Bullets.
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