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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
111

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Phormidium phycoerythrin forms hexamers in crystals: a crystallographic study.

Ravi Raghav Sonani1, Mahima Sharma2, Gagan Deep Gupta2

  • 1BRD School of Biosciences, Sardar Patel University, Post Box No. 39, Satellite Campus, Vadtal Road, Vallabh Vidyanagar 388 120, India.

Acta Crystallographica. Section F, Structural Biology Communications
|August 8, 2015
PubMed
Summary

Crystallographic analysis reveals unique structural features of marine cyanobacterium Phormidium phycoerythrin. This study details its crystal structure and chromophore composition, distinct from related algae proteins.

Keywords:
X-ray diffractioncrystal structurephycoerythrin

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Area of Science:

  • Structural Biology
  • Marine Microbiology
  • Biochemistry

Background:

  • Phycoerythrin (PE) is a crucial light-harvesting pigment in marine cyanobacteria.
  • Distinct PE structures from cyanobacteria and red algae are known.
  • Understanding Phormidium PE offers insights into marine photosynthetic adaptations.

Purpose of the Study:

  • To determine the crystal structure of phycoerythrin from the marine cyanobacterium Phormidium sp. A09DM.
  • To compare its structural features with known PE from other organisms.
  • To characterize its chromophore composition.

Main Methods:

  • Crystallization using sitting-drop vapour-diffusion with ammonium sulfate.
  • X-ray diffraction data collection at the Indus-2 synchrotron.
  • Protein crystallography and molecular replacement for structure determination.

Main Results:

  • Phormidium PE crystals belonged to space group P1, diffracting to 2.1 Å resolution.
  • The crystal lattice contains [(αβ)3]2 hexamers, unlike higher-order structures in red algal PE.
  • A single absorption band at 564 nm indicates phycoerythrobilin chromophores only.

Conclusions:

  • Phormidium PE exhibits unique structural characteristics compared to cyanobacterial and red algal PEs.
  • The hexameric structure does not form higher-order assemblies.
  • The pigment is composed solely of phycoerythrobilin chromophores.