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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
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Structural basis for catalysis in a CDP-alcohol phosphotransferase.

Giuliano Sciara1, Oliver B Clarke2, David Tomasek1

  • 11] Department of Physiology and Cellular Biophysics, Columbia University, New York, New York 10032, USA [2].

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|June 14, 2014
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Summary

Researchers determined the crystal structure of CDP-alcohol phosphotransferase (CDP-AP), an enzyme crucial for phospholipid biosynthesis. The structure reveals key residues and a proposed mechanism involving the fourth aspartate (D4) as the catalytic base.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • CDP-alcohol phosphotransferase (CDP-AP) enzymes are vital for phospholipid biosynthesis in all life forms.
  • These integral membrane enzymes catalyze essential phosphate transfer reactions.

Purpose of the Study:

  • To elucidate the structural basis of CDP-AP function.
  • To determine the mechanism of action for this important enzyme family.

Main Methods:

  • X-ray crystallography was used to obtain high-resolution (2.0 Å) structures of Archaeoglobus fulgidus CDP-AP (AF2299).
  • Structures were determined in apo, CMP-bound, CDP-bound, and CDP-glycerol-bound states.

Main Results:

  • The crystal structure revealed AF2299 as a homodimer with six transmembrane helices and a cytosolic domain.
  • The active site is located in a polar cavity within the membrane and is characterized by a conserved CDP-AP signature motif.
  • Functional roles of eight conserved residues were defined, including the fourth aspartate (D4) as the catalytic base.

Conclusions:

  • A sequential, base-catalyzed mechanism for CDP-AP function is proposed.
  • The findings provide a structural foundation for understanding phospholipid biosynthesis.
  • This work offers insights into a universal mechanism across the CDP-AP enzyme family.