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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cysteine cathepsins as digestive enzymes in the spider Nephilengys cruentata

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Fuzita, Felipe J. [1, 2] ; Pinkse, Martijn W. H. [3] ; Verhaert, Peter D. E. M. [3] ; Lopes, Adriana R. [1, 2]
Total Authors: 4
[1] Inst Butantan, Lab Biochem & Biophys, Sao Paulo - Brazil
[2] Univ Sao Paulo, Biotechnol Program, Sao Paulo - Brazil
[3] Delft Univ Technol, Lab Analyt Biotechnol & Innovat Peptide Biol, Delft - Netherlands
Total Affiliations: 3
Document type: Journal article
Source: Insect Biochemistry and Molecular Biology; v. 60, p. 47-58, MAY 2015.
Web of Science Citations: 6

Cysteine cathepsins are widely spread on living organisms associated to protein degradation in lysosomes, but some groups of Arthropoda (Heteroptera, Coleoptera, Crustacea and Acari) present these enzymes related to digestion of the meal proteins. Although spiders combine a mechanism of extra-oral with intracellular digestion, the sporadic studies on this subject were mainly concerned with the digestive fluid (DF) analysis. Thus, a more complete scenario of the digestive process in spiders is still lacking in the literature. In this paper we describe the identification and characterization of cysteine cathepsins in the midgut diverticula (MD) and DF of the spider Nephilengys cruentata by using enzymological assays. Furthermore, qualitative and quantitative data from transcriptomic followed by proteomic experiments were used together with biochemical assays for results interpretation. Five cathepsins L, one cathepsin F and one cathepsin B were identified by mass spectrometry, with cathepsins L1 (NcCTSL1) and 2 (NcCTSL2) as the most abundant enzymes. The native cysteine cathepsins presented acidic characteristics such as pH optima of 5.5, pH stability in acidic range and zymogen conversion to the mature form after in vitro acidification. NcCTSL1 seems to be a lysosomal enzyme with its recombinant form displaying acidic characteristics as the native ones and being inhibited by pepstatin. Evolutionarily, arachnid cathepsin L may have acquired different roles but its use for digestion is a common feature to studied taxa. Now a more elucidative picture of the digestive process in spiders can be depicted, with trypsins and astacins acting extra-orally under alkaline conditions whereas cysteine cathepsins will act in an acidic environment, likely in the digestive vacuoles or lysosome-like vesicles. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 05/02486-1 - Digestion in Arachnida and the control of proteolytic activity
Grantee:Adriana Rios Lopes
Support type: Regular Research Grants