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Fingerprinting G-protein-coupled receptors
1Department of Biochemistry and Molecular Biology, University of Leeds, UK.
Protein Engineering
|February 1, 1994
Summary
A new G-protein-coupled receptor (GPCR) fingerprint identifies 332 rhodopsin-like receptors. Partial matches, mainly olfactory receptors, suggest distinct subfamilies, aiding GPCR identification and classification.
Area of Science:
- Biochemistry
- Genomics
- Bioinformatics
Background:
- G-protein-coupled receptors (GPCRs) are crucial membrane proteins involved in cellular signaling.
- Previous work established a sequence-based fingerprint for identifying rhodopsin-like GPCRs.
Purpose of the Study:
- To update and validate the GPCR fingerprint with an expanded sequence database.
- To investigate discrepancies and identify novel GPCR families using the updated fingerprint.
Main Methods:
- Utilized an updated OWL composite sequence database (3-fold larger).
- Applied a discriminating sequence fingerprint targeting seven transmembrane motifs.
- Performed preliminary phylogenetic analyses to support sequence-based classifications.
Main Results:
- Identified 332 high-confidence rhodopsin-like GPCRs.
- Detected 61 partial matches, predominantly olfactory receptors, indicating subfamily divergence.
- Phylogenetic analysis confirmed distinct clustering of partial matches, including olfactory receptors.
Conclusions:
- The updated GPCR fingerprint is a powerful diagnostic tool for identifying GPCRs.
- Partial matches highlight sequence heterogeneity within GPCR superfamilies, particularly olfactory receptors.
- Results support the classification of pheromone, cAMP, and secretin receptors as distinct families.