A zymogen form of masquerade-like serine proteinase homologue is cleaved during pro-phenoloxidase activation by Ca2+ in coleopteran and Tenebrio molitor larvae

Kum Young Lee, Rong Zhang, Moon Suk Kim, Ji Won Park, Ho Young Park, Shun Ichiro Kawabata, Bok Luel Lee

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

To elucidate the biochemical activation mechanism of the insect pro-phenoloxidase (pro-PO) system, we purified a 45-kDa protein to homogeneity from the hemolymph of Tenebrio molitor (mealworm) larvae, and cloned its cDNA. The overall structure of the 45-kDa protein is similar to Drosophila masquerade serine proteinase homologue, which isan essential component in Drosophila muscle development. This Tenebrio masquerade-like serine proteinase homologue (Tm-mas) contains a trypsin-like serine proteinase domain in the C-terminal region, except for the substitution of Ser to Gly at the active site triad, and a disulfide-knotted domain at the amino-terminal region. When the purified 45-kDa Tm-mas was incubated with CM-Toyopearl eluate solution containing pro-PO and other pro-PO activating factors, the resulting phenoloxidase (PO) activity was shown to be independent of Ca2+. This suggests that the purified 45-kDa Tm-mas is an activated form of pro-PO activating factor. The 55-kDa zymogen form of Tm-mas was detected in the hemolymph when PO activity was not evident. However, when Tenebrio hemolymph was incubated with Ca2+, a 79-kDa Tenebrio pro-PO and the 55-kDa zymogen Tm-mas converted to 76-kDa PO and 45-kDa Tm-mas, respectively, with detectable PO activity. Furthermore, when Tenebrio hemolymph was incubated with Ca2+ and β-1,3-glucan, the conversion of pro-PO to PO and the 55-kDa zymogen Tm-mas to the 45-kDa protein, was faster than in the presence of Ca2+ only. These results suggest that the cleavage of the 55-kDa zymogen of Tm-mas by a limited proteolysis is necessary for PO activity, and the Tm-mas is a pro-PO activating cofactor.

Original languageEnglish
Pages (from-to)4375-4383
Number of pages9
JournalEuropean Journal of Biochemistry
Volume269
Issue number17
DOIs
Publication statusPublished - Sep 25 2002

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Tenebrio
Enzyme Precursors
Serine Proteases
Monophenol Monooxygenase
Larva
Chemical activation
Hemolymph
Drosophila
Proteolysis
Proteins
Glucans
Muscle Development
pro-phenoloxidase
Disulfides
Trypsin
Insects
Muscle
Catalytic Domain
Substitution reactions
Complementary DNA

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

A zymogen form of masquerade-like serine proteinase homologue is cleaved during pro-phenoloxidase activation by Ca2+ in coleopteran and Tenebrio molitor larvae. / Lee, Kum Young; Zhang, Rong; Kim, Moon Suk; Park, Ji Won; Park, Ho Young; Kawabata, Shun Ichiro; Lee, Bok Luel.

In: European Journal of Biochemistry, Vol. 269, No. 17, 25.09.2002, p. 4375-4383.

Research output: Contribution to journalArticle

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abstract = "To elucidate the biochemical activation mechanism of the insect pro-phenoloxidase (pro-PO) system, we purified a 45-kDa protein to homogeneity from the hemolymph of Tenebrio molitor (mealworm) larvae, and cloned its cDNA. The overall structure of the 45-kDa protein is similar to Drosophila masquerade serine proteinase homologue, which isan essential component in Drosophila muscle development. This Tenebrio masquerade-like serine proteinase homologue (Tm-mas) contains a trypsin-like serine proteinase domain in the C-terminal region, except for the substitution of Ser to Gly at the active site triad, and a disulfide-knotted domain at the amino-terminal region. When the purified 45-kDa Tm-mas was incubated with CM-Toyopearl eluate solution containing pro-PO and other pro-PO activating factors, the resulting phenoloxidase (PO) activity was shown to be independent of Ca2+. This suggests that the purified 45-kDa Tm-mas is an activated form of pro-PO activating factor. The 55-kDa zymogen form of Tm-mas was detected in the hemolymph when PO activity was not evident. However, when Tenebrio hemolymph was incubated with Ca2+, a 79-kDa Tenebrio pro-PO and the 55-kDa zymogen Tm-mas converted to 76-kDa PO and 45-kDa Tm-mas, respectively, with detectable PO activity. Furthermore, when Tenebrio hemolymph was incubated with Ca2+ and β-1,3-glucan, the conversion of pro-PO to PO and the 55-kDa zymogen Tm-mas to the 45-kDa protein, was faster than in the presence of Ca2+ only. These results suggest that the cleavage of the 55-kDa zymogen of Tm-mas by a limited proteolysis is necessary for PO activity, and the Tm-mas is a pro-PO activating cofactor.",
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AU - Lee, Kum Young

AU - Zhang, Rong

AU - Kim, Moon Suk

AU - Park, Ji Won

AU - Park, Ho Young

AU - Kawabata, Shun Ichiro

AU - Lee, Bok Luel

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