Microscopic model of protein crystal growth
Identifieur interne : 003726 ( Main/Exploration ); précédent : 003725; suivant : 003727Microscopic model of protein crystal growth
Auteurs : Andrzej M. Kierzek [Pologne] ; Piotr Pokarowski [Pologne] ; Piotr Zielenkiewicz [Pologne]Source :
- Biophysical Chemistry [ 0301-4622 ] ; 2000.
English descriptors
- KwdEn :
- Teeft :
- Acta cryst, Aggregation, Algorithm, Algorithm simulations, Biophys, Biophysical, Biophysical chemistry, Central molecule, Computer resources, Computer simulations, Critical size, Cryst, Crystal, Crystal environment, Crystal face, Crystal growth, Crystal order, Crystal structure, Crystallisation, Crystallisation conditions, Crystallisation pathways, Crystallisation process, Dimer, Discrete orientational state, Dissociation probability, Early growth stages, Early stages, Electron microscopy, Equilibrium concentration, Experimental data, Feher, Free association energy, Free energy, Free interaction energy, Free monomers, Geometrical constraints, Georgalis, Good sites, Growth curve, Growth pathway, Growth rate, Growth simulations, Growth trajectory, Growth unit, Growth units, Initial complexes, Interaction energies, Interface, Kierzek, Kinetic pathways, Kinetic traps, Kinetics, Large number, Lattice, Lattice simulations, Linear dimension, Lysozyme, Macroscopic, Macroscopic crystal, Macroscopic crystals, Maximal size, Methods enzymol, Microcrystal, Microcrystals, Molecule, Monomer, Neighbouring, Neighbouring nodes, Node, Nucleation, Orientational, Orientational probability, Orientational states, Other molecules, Pathway, Protein crystal growth, Protein crystallisation, Protein crystallization, Protein crystals, Protein molecule, Protein molecules, Protein monomers, Shortest time, Simulation, Single molecules, Size smax, Small complexes, Smax, Surface aggregation, Surface area, Tetragonal, Tetragonal lysozyme crystal, Tetramer, Time step, Timestep, Timesteps, Unit cells, Volume fraction.
Abstract
Abstract: A microscopic, reversible model to study protein crystal nucleation and growth is presented. The probability of monomer attachment to the growing crystal was assumed to be proportional to the protein volume fraction and the orientational factor representing the anisotropy of protein molecules. The rate of detachment depended on the free energy of association of the given monomer in the lattice, as calculated from the buried surface area. The proposed algorithm allowed the simulation of the process of crystal growth from free monomers to complexes having 105 molecules, i.e. microcrystals with already formed faces. These simulations correctly reproduced the crystal morphology of the chosen model system — the tetragonal lysozyme crystal. We predicted the critical size, after which the growth rate rapidly increased to approximately 50 protein monomers. The major factors determining the protein crystallisation kinetics were the geometry of the protein molecules and the resulting number of kinetics traps on the growth pathway.
Url:
DOI: 10.1016/S0301-4622(00)00179-4
Affiliations:
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Le document en format XML
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<term>Protein crystallisation</term>
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<term>Aggregation</term>
<term>Algorithm</term>
<term>Algorithm simulations</term>
<term>Biophys</term>
<term>Biophysical</term>
<term>Biophysical chemistry</term>
<term>Central molecule</term>
<term>Computer resources</term>
<term>Computer simulations</term>
<term>Critical size</term>
<term>Cryst</term>
<term>Crystal</term>
<term>Crystal environment</term>
<term>Crystal face</term>
<term>Crystal growth</term>
<term>Crystal order</term>
<term>Crystal structure</term>
<term>Crystallisation</term>
<term>Crystallisation conditions</term>
<term>Crystallisation pathways</term>
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<term>Discrete orientational state</term>
<term>Dissociation probability</term>
<term>Early growth stages</term>
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<term>Electron microscopy</term>
<term>Equilibrium concentration</term>
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<term>Free association energy</term>
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<term>Growth rate</term>
<term>Growth simulations</term>
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<term>Growth unit</term>
<term>Growth units</term>
<term>Initial complexes</term>
<term>Interaction energies</term>
<term>Interface</term>
<term>Kierzek</term>
<term>Kinetic pathways</term>
<term>Kinetic traps</term>
<term>Kinetics</term>
<term>Large number</term>
<term>Lattice</term>
<term>Lattice simulations</term>
<term>Linear dimension</term>
<term>Lysozyme</term>
<term>Macroscopic</term>
<term>Macroscopic crystal</term>
<term>Macroscopic crystals</term>
<term>Maximal size</term>
<term>Methods enzymol</term>
<term>Microcrystal</term>
<term>Microcrystals</term>
<term>Molecule</term>
<term>Monomer</term>
<term>Neighbouring</term>
<term>Neighbouring nodes</term>
<term>Node</term>
<term>Nucleation</term>
<term>Orientational</term>
<term>Orientational probability</term>
<term>Orientational states</term>
<term>Other molecules</term>
<term>Pathway</term>
<term>Protein crystal growth</term>
<term>Protein crystallisation</term>
<term>Protein crystallization</term>
<term>Protein crystals</term>
<term>Protein molecule</term>
<term>Protein molecules</term>
<term>Protein monomers</term>
<term>Shortest time</term>
<term>Simulation</term>
<term>Single molecules</term>
<term>Size smax</term>
<term>Small complexes</term>
<term>Smax</term>
<term>Surface aggregation</term>
<term>Surface area</term>
<term>Tetragonal</term>
<term>Tetragonal lysozyme crystal</term>
<term>Tetramer</term>
<term>Time step</term>
<term>Timestep</term>
<term>Timesteps</term>
<term>Unit cells</term>
<term>Volume fraction</term>
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<front><div type="abstract" xml:lang="en">Abstract: A microscopic, reversible model to study protein crystal nucleation and growth is presented. The probability of monomer attachment to the growing crystal was assumed to be proportional to the protein volume fraction and the orientational factor representing the anisotropy of protein molecules. The rate of detachment depended on the free energy of association of the given monomer in the lattice, as calculated from the buried surface area. The proposed algorithm allowed the simulation of the process of crystal growth from free monomers to complexes having 105 molecules, i.e. microcrystals with already formed faces. These simulations correctly reproduced the crystal morphology of the chosen model system — the tetragonal lysozyme crystal. We predicted the critical size, after which the growth rate rapidly increased to approximately 50 protein monomers. The major factors determining the protein crystallisation kinetics were the geometry of the protein molecules and the resulting number of kinetics traps on the growth pathway.</div>
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