Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase

Attila Iliás, K. Liliom, Brigitte Greiderer-Kleinlercher, Stephan Reitinger, Günter Lepperdinger

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Hyaluronan (HA), a polymeric glycosaminoglycan ubiquitously present in higher animals, is hydrolyzed by hyaluronidases (HAases). Here, we used bee HAase as a model enzyme to study the HA-HAase interaction. Located in close proximity to the active center, a bulky surface loop, which appears to obstruct one end of the substrate binding groove, was found to be functionally involved in HA turnover. To better understand kinetic changes in substrate interaction, binding of high molecular weight HA to catalytically inactive HAase was monitored by means of quartz crystal microbalance technology. Replacement of the delimiting loop by a tetrapeptide interconnection increased the affinity for HA up to 100-fold, with a K D below 1 nM being the highest affinity among HA-binding proteins surveyed so far. The experimental data of HA-HAase interaction were further validated showing best fit to the theoretically proposed sequential two-site model. Besides the one, which had been shown previously in course of x-ray structure determination, a previously unrecognized binding site works in conjunction with an unbinding loop that facilitates liberation of hydrolyzed HA.

Original languageEnglish
Pages (from-to)35699-35707
Number of pages9
JournalJournal of Biological Chemistry
Volume286
Issue number41
DOIs
Publication statusPublished - Oct 14 2011

Fingerprint

Hyaluronoglucosaminidase
Bees
Hyaluronic Acid
CD44 Antigens
Quartz Crystal Microbalance Techniques
Quartz crystal microbalances
Substrates
Glycosaminoglycans
Animals
Molecular Weight
Molecular weight
Binding Sites
X-Rays
Technology
X rays
Kinetics
Enzymes

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Iliás, A., Liliom, K., Greiderer-Kleinlercher, B., Reitinger, S., & Lepperdinger, G. (2011). Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase. Journal of Biological Chemistry, 286(41), 35699-35707. https://doi.org/10.1074/jbc.M111.263731

Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase. / Iliás, Attila; Liliom, K.; Greiderer-Kleinlercher, Brigitte; Reitinger, Stephan; Lepperdinger, Günter.

In: Journal of Biological Chemistry, Vol. 286, No. 41, 14.10.2011, p. 35699-35707.

Research output: Contribution to journalArticle

Iliás, A, Liliom, K, Greiderer-Kleinlercher, B, Reitinger, S & Lepperdinger, G 2011, 'Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase', Journal of Biological Chemistry, vol. 286, no. 41, pp. 35699-35707. https://doi.org/10.1074/jbc.M111.263731
Iliás, Attila ; Liliom, K. ; Greiderer-Kleinlercher, Brigitte ; Reitinger, Stephan ; Lepperdinger, Günter. / Unbinding of hyaluronan accelerates the enzymatic activity of bee hyaluronidase. In: Journal of Biological Chemistry. 2011 ; Vol. 286, No. 41. pp. 35699-35707.
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