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Structural studies on Laz, a promiscuous anticancer Neisserial protein.

Wataru Hashimoto1, Akihito Ochiai, Chang Soo Hong

  • 1a Laboratory of Basic and Applied Molecular Biotechnology; Graduate School of Agriculture ; Kyoto University ; Uji , Kyoto , Japan.

Bioengineered
|February 26, 2015
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Summary
This summary is machine-generated.

Lipidated azurin (Laz) uses a flexible H.8 epitope to cross the blood-brain barrier and target glioblastomas. This structural flexibility explains Laz

Keywords:
H.8 epitopeX-ray crystallographyazurindisorderlazneisseria

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Oncology

Background:

  • Azurin and lipidated azurin (Laz) are bacterial proteins with therapeutic potential.
  • Laz, unlike azurin (Paz), can target brain tumors due to its H.8 epitope.
  • The mechanism by which the H.8 epitope facilitates brain tumor entry is unclear.

Purpose of the Study:

  • To elucidate the structural features of the H.8 epitope in Laz.
  • To understand how the H.8 epitope enables Laz to cross the blood-brain barrier and target glioblastomas.

Main Methods:

  • X-ray crystallography was used to determine the structure of the H.8 moiety in Laz.
  • Structural comparison of Laz, Paz, and H.8 epitope-deficient Laz.

Main Results:

  • The azurin moiety of Laz exhibits a conserved β-sandwich fold.
  • The H.8 epitope was found to be a disordered structure.
  • The H.8 motif's structural flexibility allows extracellular binding to brain tumor cells, disrupting tight junctions and enabling tumor entry.

Conclusions:

  • The disordered and flexible structure of the H.8 epitope is key to Laz's ability to target brain tumors.
  • This flexibility facilitates disruption of brain tumor cell junctions, allowing Laz to enter and exert cytotoxicity.
  • Laz represents a promising therapeutic agent for glioblastomas.