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Target Snapshot

CHEMBL1741221 Target Snapshot

Cysteine protease ATG4B · SINGLE PROTEIN · Homo sapiens

663Compounds
62Assays
1Approved Drugs
526.0Activities
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 2026-09-14

Protein identity stays anchored to UniProt Q9Y4P1. Use UniProt Q9Y4P1 as the stable identity anchor, then attach disease evidence before program review.

Review focus
Protein anchor ready

Use UniProt Q9Y4P1 as the stable identity anchor, then attach disease evidence before program review.

ChEMBL component mapping + Open Targets-ready proxy + ChEMBL 36 via Core Engine 2026-09-14
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 Cysteine protease ATG4B as ChEMBL target CHEMBL1741221, mapped to UniProt Q9Y4P1. Disease framing currently uses the Open Targets-ready proxy contract.

Review anchor
Cysteine protease ATG4B
SINGLE PROTEIN · Homo sapiens
As of 2026-09-14
ChEMBL target ID
CHEMBL1741221
Primary anchor for compounds, assays, approvals, and exports
ChEMBL 36 via Core Engine As of 2026-09-14
www.ebi.ac.uk
UniProt accession
Q9Y4P1
Cysteine protease ATG4B
UniProt accession via ChEMBL component mapping As of 2026-09-14
www.uniprot.org
Disease evidence contract
Open Targets-ready proxy
ChEMBL drug mechanism + indication proxy
ChEMBL drug mechanism + indication proxy As of 2026-09-14
www.ebi.ac.uk

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

Source Guidance

Start with the right source

Choose the first block or source based on the question you are trying to answer.

Need stable target naming and protein identity?
UniProt Target Context
UniProt accession via ChEMBL component mapping

Start here when your first question is whether Cysteine protease ATG4B is the right protein anchor across sources, using UniProt Q9Y4P1 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

Verify identity, organism, and the fastest next research jumps from the same page.

UniProt Context

UniProt Target Context

Reviewable protein naming and mapping context for this target snapshot.

Protein LabelCysteine protease ATG4B
UniProt AccessionQ9Y4P1
Component TypeProtein
Sequence Length393 aa

Cysteine protease ATG4B

Source · UniProt accession via ChEMBL component mapping
Review Cue

How to read this target

Review this target as Cysteine protease ATG4B, mapped to UniProt Q9Y4P1. Sequence length is 393 aa.

Mapped IDQ9Y4P1
Review nameCysteine protease ATG4B
OrganismHomo sapiens
Clinical Profile

Clinical Phase Distribution

1
Approved
3
Phase III
3
Phase II
Assay Mix

Activity Type Distribution

IC50523.0
KI2.0
KD1.0
Lead Set

Top Inhibitors (by pChEMBL)

ChEMBL IDpChEMBLTypeValue (nM)Phase
CHEMBL4581663 7.82 IC50 15.0 Preclinical
CHEMBL4546760 7.22 IC50 60.0 Preclinical
CHEMBL4520267 7.14 IC50 73.0 Preclinical
CHEMBL4520585 6.89 IC50 130.0 Preclinical
CHEMBL51085 6.75 IC50 180.0 Clinical
CHEMBL4553669 6.72 IC50 190.0 Preclinical
CHEMBL4567870 6.57 IC50 270.0 Preclinical
CHEMBL1496397 6.5 IC50 316.0 Preclinical
CHEMBL4469737 6.44 IC50 360.0 Preclinical
CHEMBL1391013 6.4 IC50 399.0 Preclinical
Distribution

pChEMBL Value Distribution

140
5.0
58
5.5
21
6.0
10
6.5
4
7.0
1
7.5
0
8.0
0
8.5
0
9.0
0
9.5
pChEMBL
Assay Landscape

Assay Landscape

62
Total Assays
325
Tested Compounds
2
Assay Types
Binding — 60 assays, 129 compounds
BAO Format Assays Compounds Avg pChEMBL
single protein format 28 84 5.4
assay format 16 5 5.5
cell-based format 16 40 5.4
Functional — 2 assays, 325 compounds
BAO Format Assays Compounds Avg pChEMBL
assay format 2 325 5.0

Confidence Score Distribution

Source · ChEMBL 36 via Core Engine