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X-ray crystallographic structure of RNase Po1 that exhibits anti-tumor activity

Hiroko Kobayashi1, Takuya Katsutani, Yumiko Hara

  • 1School of Pharmacy, Nihon University.

Biological & Pharmaceutical Bulletin
|June 3, 2014
PubMed

Insights

RNase Po1, a fungal enzyme, exhibits anti-cancer properties due to its unique cationic charge and structural stability. These features differ from non-toxic RNase T1, suggesting a novel mechanism for inhibiting tumor cell proliferation.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • RNase Po1 from Pleurotus ostreatus is a guanylic acid-specific ribonuclease.
  • RNase Po1 inhibits human tumor cell proliferation, unlike other RNase T1 family members.

Purpose of the Study:

  • To elucidate the structural basis for RNase Po1's anti-cancer activity.
  • To compare the structure and properties of RNase Po1 with the non-toxic RNase T1.

Main Methods:

  • Three-dimensional X-ray crystallography to determine RNase Po1 structure.
  • Comparative analysis of RNase Po1 and RNase T1 structures, including catalytic sites and disulfide bonds.
  • Electrostatic potential mapping of protein surfaces.

Main Results:

  • Catalytic sites of RNase Po1 and RNase T1 are conserved.
  • RNase Po1 possesses three disulfide bonds, one more than RNase T1, enhancing its stability.
  • RNase Po1 exhibits a cationic surface, while RNase T1 is anionic, suggesting electrostatic membrane binding.

Conclusions:

  • The increased structural stability and cationic nature of RNase Po1 are critical for its anti-cancer properties.
  • RNase Po1's cationic charge may facilitate electrostatic binding to cell membranes, contributing to its cytotoxicity.

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