Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport
Mammals obtain nitrogen via the uptake of di- and tri-peptides in the gastrointestinal tract through the action of PepT1 and PepT2, which are members of the POT family of proton-coupled oligopeptide transporters. PepT1 and PepT2 also play an important role in drug transport in the human body. Recent...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
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Elsevier
2015
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| Online Access: | https://eprints.nottingham.ac.uk/41977/ |
| _version_ | 1848796392331411456 |
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| author | Beale, John H. Parker, Joanne L. Samsudin, Firdaus Barrett, Anne L. Senan, Anish Bird, Louise E. Scott, David Owens, Raymond J. Sansom, Mark S.P. Tucker, Stephen J. Meredith, David Fowler, Philip W. Newstead, Simon |
| author_facet | Beale, John H. Parker, Joanne L. Samsudin, Firdaus Barrett, Anne L. Senan, Anish Bird, Louise E. Scott, David Owens, Raymond J. Sansom, Mark S.P. Tucker, Stephen J. Meredith, David Fowler, Philip W. Newstead, Simon |
| author_sort | Beale, John H. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Mammals obtain nitrogen via the uptake of di- and tri-peptides in the gastrointestinal tract through the action of PepT1 and PepT2, which are members of the POT family of proton-coupled oligopeptide transporters. PepT1 and PepT2 also play an important role in drug transport in the human body. Recent crystal structures of bacterial homologs revealed a conserved peptide-binding site and mechanism of transport. However, a key structural difference exists between bacterial and mammalian homologs with only the latter containing a large extracellular domain, the function of which is currently unknown. Here, we present the crystal structure of the extracellular domain from both PepT1 and PepT2 that reveal two immunoglobulin-like folds connected in tandem, providing structural insight into mammalian peptide transport. Functional and biophysical studies demonstrate that these domains interact with the intestinal protease trypsin, suggesting a role in clustering proteolytic activity to the site of peptide transport in eukaryotic cells. |
| first_indexed | 2025-11-14T19:47:15Z |
| format | Article |
| id | nottingham-41977 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:47:15Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-419772020-05-04T17:20:18Z https://eprints.nottingham.ac.uk/41977/ Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport Beale, John H. Parker, Joanne L. Samsudin, Firdaus Barrett, Anne L. Senan, Anish Bird, Louise E. Scott, David Owens, Raymond J. Sansom, Mark S.P. Tucker, Stephen J. Meredith, David Fowler, Philip W. Newstead, Simon Mammals obtain nitrogen via the uptake of di- and tri-peptides in the gastrointestinal tract through the action of PepT1 and PepT2, which are members of the POT family of proton-coupled oligopeptide transporters. PepT1 and PepT2 also play an important role in drug transport in the human body. Recent crystal structures of bacterial homologs revealed a conserved peptide-binding site and mechanism of transport. However, a key structural difference exists between bacterial and mammalian homologs with only the latter containing a large extracellular domain, the function of which is currently unknown. Here, we present the crystal structure of the extracellular domain from both PepT1 and PepT2 that reveal two immunoglobulin-like folds connected in tandem, providing structural insight into mammalian peptide transport. Functional and biophysical studies demonstrate that these domains interact with the intestinal protease trypsin, suggesting a role in clustering proteolytic activity to the site of peptide transport in eukaryotic cells. Elsevier 2015-10-06 Article PeerReviewed Beale, John H., Parker, Joanne L., Samsudin, Firdaus, Barrett, Anne L., Senan, Anish, Bird, Louise E., Scott, David, Owens, Raymond J., Sansom, Mark S.P., Tucker, Stephen J., Meredith, David, Fowler, Philip W. and Newstead, Simon (2015) Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport. Structure (London, England : 1993), 23 (10). pp. 1889-1899. ISSN 1878-4186 http://www.sciencedirect.com/science/article/pii/S0969212615003226 doi:10.1016/j.str.2015.07.016 doi:10.1016/j.str.2015.07.016 |
| spellingShingle | Beale, John H. Parker, Joanne L. Samsudin, Firdaus Barrett, Anne L. Senan, Anish Bird, Louise E. Scott, David Owens, Raymond J. Sansom, Mark S.P. Tucker, Stephen J. Meredith, David Fowler, Philip W. Newstead, Simon Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title | Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title_full | Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title_fullStr | Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title_full_unstemmed | Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title_short | Crystal structures of the extracellular domain from PepT1 and PepT2 provide novel insights into mammalian pPeptide transport |
| title_sort | crystal structures of the extracellular domain from pept1 and pept2 provide novel insights into mammalian ppeptide transport |
| url | https://eprints.nottingham.ac.uk/41977/ https://eprints.nottingham.ac.uk/41977/ https://eprints.nottingham.ac.uk/41977/ |