Structure and function insights garnered from in silico modeling of the thrombospondin type-1 domain-containing 7A antigen
| Autor: | Hong Ma, Mounika P. Aramandla, Serena D. Stoddard, Laurence H. Beck, Maggie M. Palopoli, Colin L. Welsh, Riya M. Patel, Shana V. Stoddard |
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| Rok vydání: | 2018 |
| Předmět: |
Models
Molecular In silico Computational biology Biochemistry Glomerulonephritis Membranous Epitope Article 03 medical and health sciences Epitopes Antigen Protein Domains Structural Biology Humans Computer Simulation Homology modeling Amino Acid Sequence Binding site Molecular Biology 030304 developmental biology Coiled coil 0303 health sciences Thrombospondin Binding Sites Sequence Homology Amino Acid Chemistry 030302 biochemistry & molecular biology Heparan sulfate binding Thrombospondins |
| Zdroj: | Proteins. 87(2) |
| ISSN: | 1097-0134 |
| Popis: | The thrombospondin type-1 domain containing 7A (THSD7A) protein is known to be one of the antigens responsible for the autoimmune disorder idiopathic membranous nephropathy. The structure of this antigen is currently unsolved experimentally. Here we present a homology model of the extracellular portion of the THSD7A antigen. The structure was evaluated for folding patterns, epitope site prediction, and function was predicted. Results show that this protein contains 21 extracellular domains and with the exception of the first two domains, has a regular repeating pattern of TSP-1-like followed by F-spondin-like domains. Our results indicate the presence of a novel Trp-ladder sequence of WxxxxW in the TSP-1-like domains. Of the 21 domains, 18 were shown to have epitope binding sites as predicted by epitopia. Several of the F-spondin-like domains have insertions in the canonical TSP fold, most notably the coiled coil region in domain 4, which may be utilized in protein-protein binding interactions, suggesting that this protein functions as a heparan sulfate binding site. |
| Databáze: | OpenAIRE |
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