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Measurement of Chitinase Activity in Biological Samples
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Human Chitotriosidase Does Not Catabolize Hyaluronan.

Ben Danielson1, Che-Hong Chen2, Gernot Kaber1

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Human chitotriosidase, an enzyme that degrades chitin, does not break down hyaluronan, a polysaccharide found in human tissues. This suggests human chitinase evolved for host defense against chitin-containing organisms.

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Area of Science:

  • Biochemistry
  • Immunology
  • Glycobiology

Background:

  • Humans possess chitotriosidase, an enzyme that degrades chitin, despite not producing chitin.
  • Chitin and hyaluronan share structural similarities, prompting investigation into chitotriosidase's role in hyaluronan degradation.

Purpose of the Study:

  • To investigate whether human chitotriosidase can hydrolyze hyaluronan.
  • To explore the functional role of human chitotriosidase in relation to endogenous polysaccharides.

Main Methods:

  • Incubation of various sizes of hyaluronan with different chitinases under diverse pH conditions for 5 days.
  • Assay for hyaluronan degradation using recombinant and control chitinases.
  • Chitosan degradation assay using recombinant chitinase as a positive control.

Main Results:

  • No degradation of hyaluronan was observed when incubated with human chitinases.
  • Commercial hyaluronidase effectively digested hyaluronan, serving as a positive control.
  • Recombinant chitinase successfully digested chitosan, confirming enzyme activity.

Conclusions:

  • Human chitotriosidase does not possess hyaluronan-degrading activity.
  • The presence of chitotriosidase in humans likely evolved for host defense against chitin-containing pathogens (fungi, insects).
  • Chitotriosidase does not function to catabolize the endogenous polymer hyaluronan.