The detoxifying effects of structural elements of persimmon tannin on Chinese cobra phospholipase A2 correlated with their structural disturbing effects well

- PT characteristic elements could neutralize the lethality, myotoxicity, and hemolysis of Chinese cobra PLA2.
- The detoxifying effects of PT structural elements correlated well with their structural disturbing effects on PLA2.
- EGCG dimer and ECG dimer may be structural requirements for the detoxifying effects of persimmon tannin.
- The great spatial structural disturbance of PLA2 induced by PT may be responsible for their detoxifying activities in vivo.

The effects of persimmon tannin (PT) characteristic structural elements on Naja atra phospholipase A2 (PLA2)-induced lethality, myotoxicity, and hemolysis in mice models were determined. In addition, methods including surface plasmon resonance, dynamic light scattering, and Fourier transform infrared spectroscopy were explored to uncover the possible detoxifying mechanisms of PT on snake venom PLA2. Our results revealed that PT characteristic elements (EGCG, ECG, A-type EGCG dimer, and A-type ECG dimer) could neutralize the lethality, myotoxicity, and hemolysis of PLA2. Moreover, the detoxifying effects of the four structural elements correlated with their structural disturbing effects well. Our results proved that A-type EGCG dimer and A-type ECG dimer may be structural requirements for the detoxifying effects of PT. We propose that the high affinity of A-type EGCG dimer and A-type ECG dimer for PLA2 and the considerable spatial structural disturbance of PLA2 induced by the dimers may be responsible for their antilethality, antimyotoxicity, and antihemolysis on Chinese cobra PLA2in vivo.

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