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Insights into substrate binding and utilization by hyaluronan synthase.

Zachery Stephens1, Julia Karasinska1, Jochen Zimmer1,2

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Summary
This summary is machine-generated.

This study reveals how hyaluronan synthase (HAS) enzymes select specific sugar substrates, clarifying the molecular basis for dual substrate specificity in hyaluronan (HA) synthesis.

Keywords:
biochemistryenzyme mechanismextracellular matrixhyaluronanmolecular biophysicsnonepolysaccharidestructural biology

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Glycobiology

Background:

  • Hyaluronan (HA) is a crucial vertebrate extracellular matrix component.
  • HA biosynthesis involves class 1 and class 2 hyaluronan synthases (HAS).
  • Class 1-NR HAS utilizes UDP-GlcNAc and UDP-GlcA but its dual substrate discrimination mechanism is unknown.

Purpose of the Study:

  • To elucidate the molecular mechanism of dual substrate recognition by Class 1-NR HAS.
  • To understand how hyaluronan synthase discriminates between UDP-GlcNAc and UDP-GlcA.

Main Methods:

  • Single-particle cryo-electron microscopy (cryo-EM) of Chlorella virus HAS (CvHAS).
  • Enzymatic assays to assess substrate turnover and primer dependence.
  • Structural analysis of dodecyl maltoside bound HAS.

Main Results:

  • A two-step mechanism for UDP-GlcA recognition and positioning by CvHAS was revealed.
  • UDP-GlcA turnover is significantly reduced without a primer, unlike UDP-GlcNAc.
  • Non-canonical acceptors can prime UDP-GlcA transfer, aiding HA synthesis.

Conclusions:

  • The study clarifies the molecular basis for HAS dual substrate specificity.
  • UDP-GlcA recognition is critical for maintaining the integrity of HA synthesis.
  • This work provides insights into the regulation of hyaluronan biosynthesis.