Publication: A role for a Hevea latex lectin-like protein in mediating rubber particle aggregation and latex coagulation
6
Issued Date
2008-01-01
Resource Type
ISSN
00319422
Other identifier(s)
2-s2.0-37549033825
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Phytochemistry. Vol.69, No.2 (2008), 339-347
Suggested Citation
Rapepun Wititsuwannakul, Piyaporn Pasitkul, Kamonwan Kanokwiroon, Dhirayos Wititsuwannakul A role for a Hevea latex lectin-like protein in mediating rubber particle aggregation and latex coagulation. Phytochemistry. Vol.69, No.2 (2008), 339-347. doi:10.1016/j.phytochem.2007.08.019 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/18783
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
A role for a Hevea latex lectin-like protein in mediating rubber particle aggregation and latex coagulation
Other Contributor(s)
Abstract
An in vitro aggregation of washed lutoid membrane and rubber particles, respectively, prepared from the bottom (lutoid) fraction and rubber layer of centrifuged fresh latex, leading to the formation of rubber coagulum necessary for a latex coagulation was demonstrated. A Triton X-100 extract of washed lutoid membrane proteins, isolated and prepared from the bottom fraction of centrifuged fresh latex was examined for its role in the latex coagulation process. It induced agglutination of rabbit erythrocytes, indicating the presence of a lectin-like protein. Hevea latex lectin-like protein (HLL) was purified to homogeneity by active chitin binding separation, followed by DEAE-Sepharose chromatography. Its Mranalyzed by SDS-PAGE was 17 kDa, whereas that determined by gel filtration was 267 kDa. The HLL had a pI value of 7.2. Several glycoproteins were shown to inhibit the HLL-induced hemagglutination. The hemagglutinin activity of HLL was enhanced by Ca2+. Of most interest was the finding that HLL strongly induced aggregation of the Hevea latex rubber particles (RP). This strong RP aggregation leads to latex coagulation, indicating the possibility that it is involved in the formation of the coagulum that plugs the latex vessel ends and stops the flow of latex upon tapping. In addition, the purified HLL also induced aggregation of RP taken from several other non-Hevea latex producing plants. This might indicate either a common or universal role of this lectin-like protein in RP aggregation and hence latex coagulation. This paper, for the first time, provides clear and unequivocal evidence for either a key biological role or physiological function of an endogeneous latex lectin-like protein in the sequential process of latex coagulation. © 2007 Elsevier Ltd. All rights reserved.