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Honsho M, Hashiguchi Y, Ghaedi K, Fujiki Y. Interaction defect of the medium isoform of PTS1-receptor Pex5p with PTS2-receptor Pex7p abrogates the PTS2 protein import into peroxisomes in mammals. J Biochem 2010; 149:203-10. [DOI: 10.1093/jb/mvq130] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kurochkin IV, Mizuno Y, Konagaya A, Sakaki Y, Schönbach C, Okazaki Y. Novel peroxisomal protease Tysnd1 processes PTS1- and PTS2-containing enzymes involved in beta-oxidation of fatty acids. EMBO J 2007; 26:835-45. [PMID: 17255948 PMCID: PMC1794383 DOI: 10.1038/sj.emboj.7601525] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Accepted: 12/05/2006] [Indexed: 12/21/2022] Open
Abstract
Peroxisomes play an important role in beta-oxidation of fatty acids. All peroxisomal matrix proteins are synthesized in the cytosol and post-translationally sorted to the organelle. Two distinct peroxisomal signal targeting sequences (PTSs), the C-terminal PTS1 and the N-terminal PTS2, have been defined. Import of precursor PTS2 proteins into the peroxisomes is accompanied by a proteolytic removal of the N-terminal targeting sequence. Although the PTS1 signal is preserved upon translocation, many PTS1 proteins undergo a highly selective and limited cleavage. Here, we demonstrate that Tysnd1, a previously uncharacterized protein, is responsible both for the removal of the leader peptide from PTS2 proteins and for the specific processing of PTS1 proteins. All of the identified Tysnd1 substrates catalyze peroxisomal beta-oxidation. Tysnd1 itself undergoes processing through the removal of the presumably inhibitory N-terminal fragment. Tysnd1 expression is induced by the proliferator-activated receptor alpha agonist bezafibrate, along with the increase in its substrates. A model is proposed where the Tysnd1-mediated processing of the peroxisomal enzymes promotes their assembly into a supramolecular complex to enhance the rate of beta-oxidation.
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Affiliation(s)
- Igor V Kurochkin
- Immunoinformatics Team, Advanced Genome Information Group, RIKEN Genomic Sciences Center, Yokohama, Japan
- Present address: Genome Annotation and Comparative Analysis Team, Computational and Experimental Systems Biology Group, RIKEN Genomic Sciences Center, Yokohama 230-0045, Japan
- IV Kurochkin, Genome Annotation and Comparative Analysis Team, Computational and Experimental Systems Biology Group, RIKEN Genomic Sciences Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan. Tel.: +81 45 503 9111 (ext 8106); Fax: +81 45 503 9176; E-mail:
| | - Yumi Mizuno
- Division of Functional Genomics and Systems Medicine, Research Center for Genomic Medicine, Saitama Medical University, Hidaka-shi, Saitama, Japan
| | | | - Yoshiyuki Sakaki
- Computational and Experimental Systems Biology Group, RIKEN Genomic Sciences Center, Yokohama, Japan
| | - Christian Schönbach
- Immunoinformatics Team, Advanced Genome Information Group, RIKEN Genomic Sciences Center, Yokohama, Japan
| | - Yasushi Okazaki
- Division of Functional Genomics and Systems Medicine, Research Center for Genomic Medicine, Saitama Medical University, Hidaka-shi, Saitama, Japan
- Division of Functional Genomics and Systems Medicine, Research Center for Genomic Medicine, Saitama Medical University, 1397-1 Yamane, Hidaka-city, Saitama 350-1241, Japan. Tel.: +81 42 985 7319; Fax: +81 42 985 7329; E-mail:
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Schliebs W, Kunau WH. PTS2 Co-receptors: Diverse proteins with common features. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2006; 1763:1605-12. [PMID: 17028014 DOI: 10.1016/j.bbamcr.2006.08.051] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Revised: 08/25/2006] [Accepted: 08/30/2006] [Indexed: 11/23/2022]
Abstract
One feature of the PTS2 import pathway is the separation of the roles of the PTS receptor between two proteins. Pex7p alone is insufficient to act as the receptor for the import cycle for peroxisomal matrix proteins. In all cases, Pex7p needs a PTS2 co-receptor to form an import-competent PTS2 receptor complex together with the PTS2 cargo. We provide an overview of the proteins that have been identified as PTS2 co-receptors and discuss their proposed functions.
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Affiliation(s)
- Wolfgang Schliebs
- Institut für Physiologische Chemie, Abt. Systembiochemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
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Stanley WA, Wilmanns M. Dynamic architecture of the peroxisomal import receptor Pex5p. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2006; 1763:1592-8. [PMID: 17141887 DOI: 10.1016/j.bbamcr.2006.10.015] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2006] [Revised: 10/26/2006] [Accepted: 10/26/2006] [Indexed: 11/29/2022]
Abstract
The majority of peroxisomal matrix proteins are recognized by the import receptor Pex5p. The receptor is dynamic in terms of its overall architecture and association with the peroxisomal membrane. It participates in different protein complexes during the translocation of cargos from the cytosol to the peroxisomal matrix. Its sequence comprises two structurally and functionally autonomous parts. The N-terminal segment interacts with several peroxins that assemble into distinct protein complexes during cargo translocation. Despite evidence for alpha-helical binding motifs for some of these components (Pex13p, Pex14p) its overall appearance is that of a molten globule and folding/unfolding transitions may play a critical role in its function. In contrast, most of the C-terminal part of the receptor folds into a ring-like alpha-helical structure and binds folded and functionally intact peroxisomal targets that bear a C-terminal peroxisomal targeting signal type-1. Some of these targets also bind to secondary binding sites of the receptor.
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Affiliation(s)
- Will A Stanley
- EMBL-Hamburg Outstation, c/o DESY, Notkestrasse 85, 22603 Hamburg, Germany
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