NDLI: The Protease-associated Domain and C-terminal Extension Are Required for Zymogen Processing, Sorting within the Secretory Pathway, and Activity of Tomato Subtilase 3 (SlSBT3)

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The Protease-associated Domain and C-terminal Extension Are Required for Zymogen Processing, Sorting within the Secretory Pathway, and Activity of Tomato Subtilase 3 (SlSBT3)

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The Protease-associated Domain and C-terminal Extension Are Required for Zymogen Processing, Sorting within the Secretory Pathway, and Activity of Tomato Subtilase 3 (SlSBT3)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gabler, Leszek Cedzich, Anna Huttenlocher, Franziska Schaller, Andreas Pfannstiel, Jens Stintzi, Annick Kuhn, Benjamin M.
Description	Author Affiliation: Cedzich A ( Institute of Plant Physiology and Biotechnology, Life Science Center, and Institute of Physiology, Department of Biosensorics, University of Hohenheim, D-70593 Stuttgart, Germany.)
Abstract	A transgenic plant cell suspension culture was established as a versatile and efficient expression system for the subtilase SlSBT3 from tomato. The recombinant protease was purified to homogeneity from culture supernatants by fractionated ammonium sulfate precipitation, batch adsorption to cation exchange material, and anion exchange chromatography. Purified SlSBT3 was identified as a 79-kDa glycoprotein with both complex and paucimannosidic type glycan chains at Asn(177), Asn(203), Asn(376), Asn(697), and Asn(745). SlSBT3 was found to be a very stable enzyme, being fully active at 60 degrees C and showing highest activity at alkaline conditions with a maximum between pH 7.5 and 8.0. Substrate specificity of SlSBT3 was analyzed in detail, revealing a preference for Gln and Lys in the P(1) and P(2) positions of oligopeptide substrates, respectively. Similar to bacterial, yeast, and mammalian subtilases, SlSBT3 is synthesized as a preproenzyme, and processing of the prodomain in the endoplasmic reticulum is a prerequisite for passage through the secretory pathway. SlSBT3 S538A and S538C active site mutants accumulated intracellularly as unprocessed zymogens, indicating that prodomain cleavage occurs autocatalytically. The wild-type SlSBT3 protein failed to cleave the prodomain of the S538A mutant in trans, demonstrating that zymogen maturation is an intramolecular process. Distinguishing features of plant as compared with mammalian subtilases include the insertion of a large protease-associated domain between the His and Ser residues of the catalytic triad and the C-terminal extension to the catalytic domain. Both features were found to be required for SlSBT3 activity and, consequently, for prodomain processing and secretion.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	21
Volume Number	284
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2009-05-22
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Enzyme Precursors Metabolism Lycopersicon Esculentum Enzymology Peptide Hydrolases Chemistry Protein Processing, Post-Translational Secretory Pathway Subtilisins Amino Acid Sequence Biocatalysis Glycosylation Kinetics Molecular Sequence Data Mutant Proteins Protein Structure, Tertiary Protein Transport Structure-Activity Relationship Substrate Specificity Isolation & Purification Tobacco Research Support, Non-U.S. Gov't Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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