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Target Snapshot

CHEMBL1945 Target Snapshot

Melatonin receptor type 1A · SINGLE PROTEIN · Homo sapiens

1,444Compounds
321Assays
10Approved Drugs
1,745.0Activities
Free Research Context

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Broader Open DB context

Frame the target before identity details

Structured disease, protein, and project context should read before the lower-level identity rail.

As of 2026-09-13

Protein identity stays anchored to UniProt P48039. Use UniProt P48039 as the stable identity anchor, then attach disease evidence before program review.

Review focus
Protein anchor ready

Use UniProt P48039 as the stable identity anchor, then attach disease evidence before program review.

ChEMBL component mapping + Open Targets-ready proxy + ChEMBL 36 via Core Engine 2026-09-13
Open source guide
Identity Layer

Cross-source identity

Keep the review anchor, source IDs, and context contract aligned before reusing this target elsewhere.

This review treats Melatonin receptor type 1A as ChEMBL target CHEMBL1945, mapped to UniProt P48039. Disease framing currently uses the Open Targets-ready proxy contract.

Review anchor
Melatonin receptor type 1A
SINGLE PROTEIN · Homo sapiens
As of 2026-09-13
ChEMBL target ID
CHEMBL1945
Primary anchor for compounds, assays, approvals, and exports
ChEMBL 36 via Core Engine As of 2026-09-13
www.ebi.ac.uk
UniProt accession
P48039
Melatonin receptor type 1A
UniProt accession via ChEMBL component mapping As of 2026-09-13
www.uniprot.org
Disease evidence contract
Open Targets-ready proxy
ChEMBL drug mechanism + indication proxy
ChEMBL drug mechanism + indication proxy As of 2026-09-13
www.ebi.ac.uk

Reuse the same identifiers in notes, watch rules, exports, and review packs so provenance stays stable across surfaces.

Source Guidance

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UniProt Target Context
UniProt accession via ChEMBL component mapping

Start here when your first question is whether Melatonin receptor type 1A is the right protein anchor across sources, using UniProt P48039 as the stable mapping.

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Disease Relevance & Evidence Level
ChEMBL drug mechanism + indication proxy

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Evidence Card
Review-ready rationale with source-aware context

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Overview

Basic Information

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UniProt Context

UniProt Target Context

Reviewable protein naming and mapping context for this target snapshot.

Protein LabelMelatonin receptor type 1A
UniProt AccessionP48039
Component TypeProtein
Sequence Length350 aa

Melatonin receptor type 1A

Source · UniProt accession via ChEMBL component mapping
Review Cue

How to read this target

Review this target as Melatonin receptor type 1A, mapped to UniProt P48039. Sequence length is 350 aa.

Mapped IDP48039
Review nameMelatonin receptor type 1A
OrganismHomo sapiens
Clinical Profile

Clinical Phase Distribution

10
Approved
2
Phase II
Assay Mix

Activity Type Distribution

IC50248.0
KI1,244.0
EC50251.0
KD2.0
Lead Set

Top Inhibitors (by pChEMBL)

ChEMBL IDpChEMBLTypeValue (nM)Phase
CHEMBL132802 11.0 Ki 0.01 Preclinical
CHEMBL330137 11.0 Ki 0.01 Preclinical
CHEMBL287560 11.0 Ki 0.01 Preclinical
CHEMBL1774529 10.96 Ki 0.011 Preclinical
CHEMBL336054 10.92 Ki 0.012 Preclinical
CHEMBL139855 10.9 IC50 0.01259 Preclinical
CHEMBL1774514 10.89 Ki 0.013 Preclinical
CHEMBL289233 10.89 Ki 0.013 Preclinical
CHEMBL1218 10.86 Ki 0.0138 Approved
CHEMBL3648356 10.82 EC50 0.015 Preclinical
Distribution

pChEMBL Value Distribution

47
5.0
94
5.5
132
6.0
165
6.5
192
7.0
166
7.5
197
8.0
149
8.5
130
9.0
114
9.5
pChEMBL
Approved Drugs

Approved Drugs

AGOMELATINE
CHEMBL10878
Approved 2009
MELATONIN
CHEMBL45
Approved 2007
RAMELTEON
CHEMBL1218
Approved 2005
Assay Landscape

Assay Landscape

321
Total Assays
1,120
Tested Compounds
2
Assay Types
Binding — 224 assays, 1,120 compounds
BAO Format Assays Compounds Avg pChEMBL
cell-based format 114 798 7.8
single protein format 97 128 8.1
cell membrane format 8 39 7.9
assay format 5 155 7.2
Functional — 97 assays, 167 compounds
BAO Format Assays Compounds Avg pChEMBL
cell-based format 82 153 8.1
assay format 13 8 7.0
cell membrane format 2 6 6.6

Confidence Score Distribution

Source · ChEMBL 36 via Core Engine