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Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...

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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules
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Published on: March 22, 2019

MIBPB: a software package for electrostatic analysis.

Duan Chen1, Zhan Chen, Changjun Chen

  • 1Department of Mathematics, Michigan State University, East Lansing, Michigan 48824, USA.

Journal of Computational Chemistry
|September 17, 2010
PubMed
Summary
This summary is machine-generated.

A new computational tool, the Matched Interface and Boundary Poisson-Boltzmann Equation (MIBPB) solver, offers accurate electrostatic analysis for biomolecules. It achieves high convergence and reliability even with coarse meshes, improving biomolecular modeling.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Electrostatics

Background:

  • The Poisson-Boltzmann equation (PBE) is crucial for biomolecular electrostatic analysis.
  • Developing advanced computational methods for PBE solutions has been a significant research area.
  • Existing PBE solvers face challenges with accuracy and convergence, especially for complex biomolecular surfaces.

Purpose of the Study:

  • To present a novel Matched Interface and Boundary (MIB)-based Poisson-Boltzmann Equation (PBE) software package, the MIBPB solver.
  • To demonstrate the MIBPB solver's capability for rigorous electrostatic analysis of biomolecules.
  • To highlight the MIBPB solver's unique advantages in accuracy, convergence, and efficiency.

Main Methods:

  • Development of a MIB-based PBE solver (MIBPB) enforcing solution and flux continuity at dielectric interfaces.
  • Integration of a Dirichlet-to-Neumann mapping technique for analytical resolution of singular charge distributions.
  • Application of Krylov subspace (KS) techniques to accelerate the convergence of linear equation systems.

Main Results:

  • The MIBPB solver achieves second-order convergence for protein molecular surfaces, even with geometrical singularities.
  • Reliable solutions are obtained at coarse meshes (1 Å) due to analytical handling of charge singularities.
  • KS techniques significantly reduce condition numbers, enhancing the efficiency of linear equation solvers.

Conclusions:

  • The MIBPB solver is the first interface technique-based PBE solver delivering second-order convergence.
  • It provides accurate and reliable electrostatic analysis for biomolecules at unprecedented coarse meshes.
  • The MIBPB package effectively calculates solvation energies and analyzes salt effects on binding energies.