Toxins 2011, 3(7), 900-910; doi:10.3390/toxins3070900
Article

Isolation and Biochemical Characterization of Rubelase, a Non-Hemorrhagic Elastase from Crotalus ruber ruber (Red Rattlesnake) Venom

1,* email, 1email, 2email and 1email
Received: 9 May 2011; in revised form: 28 June 2011 / Accepted: 12 July 2011 / Published: 19 July 2011
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A novel non-hemorrhagic basic metalloprotease, rubelase, was isolated from the venom of Crotalus ruber ruber. Rubelase hydrolyzes succinyl-L-alanyl-L-alanyl-L-alanyl p-nitroanilide (STANA), a specific substrate for elastase, and the hydrolytic activity was inhibited by chelating agents. It also hydrolyzes collagen and fibrinogen. However, hemorrhagic activity was not observed. By ESI/Q-TOF and MALDI/TOF mass spectrometry combined with Edman sequencing procedure, the molecular mass of rubelase was determined to be 23,266 Da. Although its primary structure was similar to rubelysin (HT-2), a hemorrhagic metalloprotease isolated from the same snake venom, the circumstances surrounding putative zinc binding domain HEXXHXXGXXH were found to be different when the three-dimensional computer models of both metalloproteases were compared. The cytotoxic effects of rubelase and rubelysin on cultured endothelial and smooth muscle cells were also different, indicating that the substitution of several amino acid residues causes the changes of active-site conformation and cell preference.
Keywords: Crotalus ruber ruber toxin; elastase; amino acid sequence; cytotoxicity
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MDPI and ACS Style

Komori, Y.; Sakai, K.; Masuda, K.; Nikai, T. Isolation and Biochemical Characterization of Rubelase, a Non-Hemorrhagic Elastase from Crotalus ruber ruber (Red Rattlesnake) Venom. Toxins 2011, 3, 900-910.

AMA Style

Komori Y, Sakai K, Masuda K, Nikai T. Isolation and Biochemical Characterization of Rubelase, a Non-Hemorrhagic Elastase from Crotalus ruber ruber (Red Rattlesnake) Venom. Toxins. 2011; 3(7):900-910.

Chicago/Turabian Style

Komori, Yumiko; Sakai, Kaname; Masuda, Katsuyoshi; Nikai, Toshiaki. 2011. "Isolation and Biochemical Characterization of Rubelase, a Non-Hemorrhagic Elastase from Crotalus ruber ruber (Red Rattlesnake) Venom." Toxins 3, no. 7: 900-910.

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