| Structural highlights
Function
[MIC1_TOXGO] Adhesin. Required for attachment of the parasite to the host cell prior to invasion. Ensures correct folding of MIC6 and transport of the MIC6-MIC1-MIC4 complex into the micronemes.[1] [2] [3] [4] [5]
Publication Abstract from PubMed
Immediately prior to invasion Toxoplasma gondii tachyzoites release a large number of micronemal proteins (TgMICs) that participate in host cell attachment and penetration. The TgMIC4-MIC1-MIC6 complex was the first to be identified in T. gondii and has been recently shown to be critical in invasion. This study establishes that the N-terminal thrombospondin type I repeat-like domains (TSR1-like) from TgMIC1 function as an independent adhesin as well as promoting association with TgMIC4. Using the newly solved three-dimensional structure of the C-terminal domain of TgMIC1 we have identified a novel Galectin-like fold that does not possess carbohydrate binding properties and redefines the architecture of TgMIC1. Instead, the TgMIC1 Galectin-like domain interacts and stabilizes TgMIC6, which provides the basis for a highly specific quality control mechanism for successful exit from the early secretory compartments and for subsequent trafficking of the complex to the micronemes.
A novel galectin-like domain from Toxoplasma gondii micronemal protein 1 assists the folding, assembly, and transport of a cell adhesion complex.,Saouros S, Edwards-Jones B, Reiss M, Sawmynaden K, Cota E, Simpson P, Dowse TJ, Jakle U, Ramboarina S, Shivarattan T, Matthews S, Soldati-Favre D J Biol Chem. 2005 Nov 18;280(46):38583-91. Epub 2005 Sep 15. PMID:16166092[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Lourenco EV, Pereira SR, Faca VM, Coelho-Castelo AA, Mineo JR, Roque-Barreira MC, Greene LJ, Panunto-Castelo A. Toxoplasma gondii micronemal protein MIC1 is a lactose-binding lectin. Glycobiology. 2001 Jul;11(7):541-7. PMID:11447133
- ↑ Reiss M, Viebig N, Brecht S, Fourmaux MN, Soete M, Di Cristina M, Dubremetz JF, Soldati D. Identification and characterization of an escorter for two secretory adhesins in Toxoplasma gondii. J Cell Biol. 2001 Feb 5;152(3):563-78. PMID:11157983
- ↑ Saouros S, Edwards-Jones B, Reiss M, Sawmynaden K, Cota E, Simpson P, Dowse TJ, Jakle U, Ramboarina S, Shivarattan T, Matthews S, Soldati-Favre D. A novel galectin-like domain from Toxoplasma gondii micronemal protein 1 assists the folding, assembly, and transport of a cell adhesion complex. J Biol Chem. 2005 Nov 18;280(46):38583-91. Epub 2005 Sep 15. PMID:16166092 doi:C500365200
- ↑ Blumenschein TM, Friedrich N, Childs RA, Saouros S, Carpenter EP, Campanero-Rhodes MA, Simpson P, Chai W, Koutroukides T, Blackman MJ, Feizi T, Soldati-Favre D, Matthews S. Atomic resolution insight into host cell recognition by Toxoplasma gondii. EMBO J. 2007 Jun 6;26(11):2808-20. Epub 2007 May 10. PMID:17491595
- ↑ Fourmaux MN, Achbarou A, Mercereau-Puijalon O, Biderre C, Briche I, Loyens A, Odberg-Ferragut C, Camus D, Dubremetz JF. The MIC1 microneme protein of Toxoplasma gondii contains a duplicated receptor-like domain and binds to host cell surface. Mol Biochem Parasitol. 1996 Dec 20;83(2):201-10. PMID:9027753
- ↑ Saouros S, Edwards-Jones B, Reiss M, Sawmynaden K, Cota E, Simpson P, Dowse TJ, Jakle U, Ramboarina S, Shivarattan T, Matthews S, Soldati-Favre D. A novel galectin-like domain from Toxoplasma gondii micronemal protein 1 assists the folding, assembly, and transport of a cell adhesion complex. J Biol Chem. 2005 Nov 18;280(46):38583-91. Epub 2005 Sep 15. PMID:16166092 doi:C500365200
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