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On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
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Published on: March 11, 2022

Optical pH detection within a protein crystal.

Klaus M Seemann1, Reiner Kiefersauer, Uwe Jacob

  • 1Peter Grünberg Institute, Research Center Jülich, 52425 Jülich, Germany. k.seemann@fz-juelich.de

The Journal of Physical Chemistry. B
|July 28, 2012
PubMed
Summary
This summary is machine-generated.

Researchers optically detected pH within protein crystals using fluorescent dyes. They found crystal pH was consistently lower than the surrounding solution, impacting protein activity.

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Area of Science:

  • Biophysics
  • Crystallography
  • Analytical Chemistry

Background:

  • Protein conformation and activity are critically dependent on pH.
  • Experimental determination of pH within protein crystals has been a significant challenge.

Purpose of the Study:

  • To develop and apply an optical method for measuring pH inside protein crystals.
  • To investigate the spatial and temporal distribution of pH within lysozyme crystals.

Main Methods:

  • Utilized pH-sensitive fluorescent dyes (SNARF-1 and SNARF-4F) diffused into lysozyme crystals.
  • Employed two-dimensional fluorescence spectroscopy and two-photon microscopy for pH detection and spatial resolution.
  • Calibrated fluorescence peak ratios to determine average crystal pH at various bath pH levels.

Main Results:

  • Successfully measured pH within lysozyme crystals.
  • Observed that the pH inside crystal channels was consistently 0.3 to 1.0 units lower than the external bath pH (at equilibrium between pH 5.5 and 8.0).
  • This indicates a 2- to 10-fold higher proton concentration within the crystal channels compared to the surrounding solution.

Conclusions:

  • Optical detection of internal crystal pH is feasible using fluorescent probes.
  • Proton accumulation within protein crystal channels suggests slower diffusion kinetics and impacts the microenvironment relevant to protein function.