Bookmark and Share
BioAssay: AID 151592

Inhibition of [3H]DAGO binding to mu 1 opioid receptor in rat brain membranes

The previous rules proposed for selective recognition of mu and delta opioid receptors by modified enkephalins were investigated through an extensive structure-activity study. Thus, modifications of the sequence of TRIMU 4 (Tyr-D-Ala-Gly-NHCH(CH3)CH2CH(CH3)2, a peptide that exhibits mu selectivity close to that of DAGO (Try-D-Ala-Gly-N(Me)Phe-Gly.ol), were performed for two positions, 2 and 4, more ..
_
   
 Tested Compounds
 Tested Compounds
All(23)
 
 
Active(23)
 
 
 Tested Substances
 Tested Substances
All(23)
 
 
Active(23)
 
 
 Related BioAssays
 Related BioAssays
AID: 151592
Data Source: ChEMBL (148839)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2010-05-21
Modify Date: 2014-05-20

Data Table ( Complete ):           Active    All
BioActive Compounds: 23
Description:
Title: Investigation of the structural parameters involved in the mu and delta opioid receptor discrimination of linear enkephalin-related peptides.

Abstract: The previous rules proposed for selective recognition of mu and delta opioid receptors by modified enkephalins were investigated through an extensive structure-activity study. Thus, modifications of the sequence of TRIMU 4 (Tyr-D-Ala-Gly-NHCH(CH3)CH2CH(CH3)2, a peptide that exhibits mu selectivity close to that of DAGO (Try-D-Ala-Gly-N(Me)Phe-Gly.ol), were performed for two positions, 2 and 4, critical for mu recognition. The drastic loss of potency following introduction of L-Ala or Aib in position 2 emphasizes the importance of the stereochemistry and the steric size of the X2 amino acid for optimal mu binding. The enhancement of the intrinsic flexibility of the C-terminal alkyl chain of TRIMU 4 through removal of a methyl group leads to TRIMU 5 (Tyr-D-Ala-Gly-NHCH2CH2CH(CH3)2), a peptide with a mu selectivity similar to that of DAGO. In contrast, introduction of an O-tert-butyl Ser2 residue increases affinity for delta receptors. In the hexapeptide series derived from DSLET (Tyr-D-Ser-Gly-Phe-Leu-Thr), a D-Thr2 moiety was shown to be very efficient in improving delta recognition and delta selectivity appeared also to be modulated by the nature of the sixth residue. The potencies of the 24 peptides studied to inhibit the electrically evoked contractions of the GPI or MVD are relatively well correlated with their affinities for brain mu or delta receptors labeled with [3H]DAGO or [3H]DSLET, respectively. Moreover, the analgesic potency (hot plate test) of the peptides is related to their affinity for rat brain mu receptors. The wide range of receptor affinities exhibited by the compounds reported here could be useful to study the physiological role of mu and delta receptors.
(PMID: 2828622)
Comment
Compounds with activity <= 50uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Putative Target:

ChEMBL Target ID: 10529
Target Type: SINGLE PROTEIN
Pref Name: Mu opioid receptor
Synonyms: M-OR-1;MOR-1;Mu-type opioid receptor;Opioid receptor B;
Gene Name: Oprm1;Ror-b;
Protein Accession: P33535;
Protein GI: 464314;
Organism: Rattus norvegicus
Tax ID: 10116
Target Classification: membrane receptor 7tm1 peptide short peptide opioid receptor
Confidence: Homologous single protein target assigned
Relationship Type: Homologous protein target assigned
Categorized Comment
Assay Type: Binding

Assay Data Source: Scientific Literature

BAO: Assay Format: subcellular format

Assay Subcellular Fraction: Brain membranes

Result Definitions
Show more
TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1Ki*Ki PubChem standard valueFloatμM
3BEIBinding Efficiency Index(nM)Float
2SEISurface Efficiency Index(nM)Float
4LELigand EfficiencyFloat
5LLELipophilic Ligand EfficiencyFloat
6Ki activity commentKi activity commentString
7Ki standard flagKi standard flagInteger
8Ki qualifierKi qualifierString
9Ki published valueKi published valueFloatnM
10Ki standard valueKi standard valueFloatnM

* Activity Concentration.

Data Table (Concise)
PageFrom: