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Isolation and characterization of putative trefoil peptide receptors
1Department of Protein Chemistry, Health Care Discovery, Novo Nordisk A/S, DK-2880, Bagsvaerd, Denmark. lth@novo.dk
Abstract:
Mammalian trefoil factors (TFFs) constitute a group of three peptides (TFF1, TFF2 and TFF3) widely distributed in the gastrointestinal tract. Although a mucosal protection/healing effect of these peptides is well documented the mechanism of action is still unknown. A mucosal membrane extract was prepared from porcine stomach scrapings and incubated with a gel containing immobilized porcine TFF2. The affinity gel material was specifically eluted with a neutral buffer containing a high concentration of the ligand (porcine TFF2). A subsequent SDS-gel electrophoresis showed one protein with a MW of approximately 220 kDa and three proteins with MW around 140 kDa. The proteins were analyzed by trypsin digestion followed by mass spectrometric sequencing of tryptic fragments. In this way a 140-kDa beta subunit of fibronectin receptor and a 224-kDa CRP-Ductin gene product were identified. The CRP-Ductin gene product (also named MUCLIN), which is expressed in the intestinal crypts, is characterized by being a membrane protein with a short cytoplasmic region, a transmembrane domain and a large extracellular region. This protein thus fulfils some of the criteria for being a TFF receptor or a TFF binding protein.
Insights
Researchers identified potential receptors for mammalian trefoil factors (TFFs), crucial peptides for gastrointestinal mucosal healing. The study identified CRP-Ductin (MUCLIN) and fibronectin receptor subunits as TFF binding proteins, offering insights into TFF mechanisms.
Area of Science:
- Gastroenterology
- Molecular Biology
- Proteomics
Background:
- Mammalian trefoil factors (TFFs) are peptides found in the gastrointestinal tract.
- TFFs are known to protect and heal the gastric mucosa, but their mechanism of action remains unclear.
Purpose of the Study:
- To identify potential TFF receptors or binding proteins involved in mucosal protection and healing.
Main Methods:
- Prepared a mucosal membrane extract from porcine stomach scrapings.
- Used an affinity gel with immobilized porcine TFF2 to isolate binding proteins.
- Analyzed eluted proteins using SDS-gel electrophoresis and mass spectrometry after trypsin digestion.
Main Results:
- Identified a 224-kDa CRP-Ductin gene product (MUCLIN) and a 140-kDa beta subunit of the fibronectin receptor.
- CRP-Ductin is a membrane protein with structural features consistent with a TFF receptor or binding protein.
Conclusions:
- CRP-Ductin (MUCLIN) and fibronectin receptor subunits are potential binding proteins for TFFs.
- These findings provide a basis for understanding the molecular mechanisms underlying TFFs' role in mucosal protection and healing.
