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Protein / target

Guanylate cyclase soluble subunit beta-1

Encoded byGUCY1B1Q02153Homo sapiensSwiss-Prot
Clinically validated
Therapeutic maturity
10
Approved medicines
Open Targets target-level
View by indication →
30
Clinical trials
Small-molecule tractable
Druggability
Approved Drug

Protein at a glance

Biological role

Protein-containing complex binding

Strongest disease association

Hypertension

Via encoding gene GUCY1B1 · Genetic evidence · score 0.56

Therapeutic position

Established drug target

Small molecules

Derived from structured UniProt, Open Targets and literature data on this page.

Protein profile

UniProt 2026_02

Canonical identity and biological annotation from UniProt.

Function overview

Mediates responses to nitric oxide (NO) by catalyzing the biosynthesis of the signaling molecule cGMP

Subcellular location

Cytoplasm
Domains and Gene Ontology detail (22)

Domains & features

H-NOXGuanylate cyclase

Gene Ontology

  • Ccytosol
  • Cglutamatergic synapse
  • Cguanylate cyclase complex, soluble
  • Cpresynaptic active zone cytoplasmic component
  • Fadenylate cyclase activity
  • Fcytidylate cyclase activity
  • FGTP binding
  • Fguanylate cyclase activity
  • Fheme binding
  • FHsp90 protein binding
  • Fmetal ion binding
  • Fnitric oxide binding

619 aa · 71 kDa · 3 isoforms

Biological roles

Reactome v97

What this protein does, drawn together from its UniProt function, Gene Ontology terms and Reactome pathways.

View underlying pathways (2)

Concepts derived from UniProt GO Reactome — each badge above shows which sources supported that role.

Interaction neighbourhood

STRING v12.0

Proteins with the strongest functional or physical association. Node size and line weight reflect STRING confidence; hover or select a partner to inspect one association.

GUCY1A1GUCY1A2PRKG1PRKG2NOS1ITPAPKLRENPP3ENPP1PKMGUCY1B1

10 strongest partners — larger node and heavier line mean higher confidence

Functional and physical associations from STRING v12.0. Only associations with this protein are drawn — partner-to-partner links are not part of this evidence.

Approved medicines with mapped indications

3 medicines · 6 areas

Approved therapies targeting this protein, grouped by what they are approved to treat — the disease-first view of the medicines below. Relationships come from the canonical approved-indication graph (ChEMBL phase-4), the same source as the drug cards.

Hypertension, Pulmonary2 medicines
Colorectal Neoplasms1 medicine
Familial Primary Pulmonary Hypertension1 medicine
Hypertension1 medicine
Respiratory Insufficiency1 medicine
Broader indication categories (1)
Respiratory Tract Diseases1 medicine

Broad umbrella indications (e.g. “Neoplasms”). Shown here because every medicine also appears under a more specific disease above — kept for completeness, de-emphasised for clarity.

10 medicines meet Open Targets' target-level approved-medicine definition; the 3 shown here are those on this page with a canonical approved disease indication in the graph. Approved indications from ChEMBL (phase-4), via the canonical drug→disease graph.

Drugs targeting this protein

3

How approved and investigational drugs engage this protein — mechanism and action type, direct vs complex targeting, and how broadly each acts across other targets. A drug-first view (the section above groups the approved ones disease-first); direct binders with few recorded targets are listed first.

Nitric Oxide
ApprovedActivator

Soluble guanylate cyclase activator

Indicated for Hypertension, Pulmonary, Respiratory Insufficiency, Respiratory Tract Diseases

Acts on a complex — shared with GUCY1B2, GUCY1A2, GUCY1A1 · 1 of 4 recorded protein targets

riociguat
ApprovedPositive allosteric modulator

Soluble guanylate cyclase positive allosteric modulator

Indicated for Familial Primary Pulmonary Hypertension, Hypertension, Hypertension, Pulmonary

Acts on a complex — shared with GUCY1B2, GUCY1A2, GUCY1A1 · 1 of 4 recorded protein targets

Soluble guanylate cyclase inhibitor

Indicated for Colorectal Neoplasms

Acts on a complex — shared with GUCY1B2, GUCY1A2, GUCY1A1 · 1 of 4 recorded protein targets

ChEMBL mechanism, action type, target identity and approved indications. Open Targets clinical status.

Translational evidence

Open Targets 26

Why this target matters therapeutically, strongest evidence first. Disease associations are gene-level (via the gene that encodes this protein) and open into the full confidence synthesis; the development universe, tractability and safety annotations are target-level, from Open Targets.

Strongest disease associations · via encoding gene GUCY1B1

Gene-level evidence surfaced through the gene GUCY1B1that encodes this protein — not a direct protein–disease relationship. Ranked by Forefront's causal-directness weighting, so genetically- and clinically-evidenced diseases lead over ones that merely share the literature.

Angina Pectoris
0.87Well supported

Clinical evidence dominant · Open Targets 0.68

Hypertension
0.87Well supported

Clinical evidence dominant · Open Targets 0.65

Coronary Artery Disease
0.80Well supported

Clinical evidence dominant · Open Targets 0.64

Heart Failure
0.77Well supported

Clinical evidence dominant · Open Targets 0.61

Myocardial Infarction
0.75Well supported

Clinical evidence dominant · Open Targets 0.59

View evidence synthesis (5)
Angina PectorisWell supported
0.87
agreement 0.770.97
Clinical60%Genetic40%

Open Targets aggregate 0.68 · 2 independent evidence families

HypertensionWell supported
0.87
agreement 0.760.97
Clinical55%Genetic45%Literature1%

Open Targets aggregate 0.65 · 3 independent evidence families

Coronary Artery DiseaseWell supported
0.80
agreement 0.690.91
Clinical78%Genetic22%Literature1%

Open Targets aggregate 0.64 · 3 independent evidence families

Heart FailureWell supported
0.77
agreement 0.660.87
Clinical81%Genetic19%

Open Targets aggregate 0.61 · 2 independent evidence families

Myocardial InfarctionWell supported
0.75
agreement 0.650.86
Clinical74%Genetic25%Literature1%

Open Targets aggregate 0.59 · 3 independent evidence families

The evidence agreement range shows how closely the independent evidence families agree — it is not a statistical confidence interval, and nothing here is fitted to outcome data. Derived from Open Targets evidence types under Forefront weighting; the per-type scores above show the calculation.

Show all associations
Angina Pectoris0.68
Hypertension0.65
Coronary Artery Disease0.64
Heart Failure0.61
Cardiovascular Diseases0.59
Myocardial Infarction0.59
Pulmonary arterial hypertension0.58
Hypertension, Pulmonary0.56

Drug development

15 compounds recorded · 10 approved · 5 in clinical development

Open Targets' development universe — every compound recorded against the target at any stage, not all approved medicines. Distinct from the 3 drugs that target this protein in Forefront's canonical graph (3 with a mapped approved indication, shown above): these count different sets and are not a subset relation.

View all recorded compounds (10)
ISOSORBIDE MONONITRATEApproval
OLINCIGUATPhase 2
RUNCACIGUATPhase 2
RIOCIGUATApproval
NITROPRUSSIDEApproval
SODIUM NITROPRUSSIDEApproval
ISOSORBIDE DINITRATEApproval
PENTAERYTHRITOL TETRANITRATEApproval
CINACIGUATPhase 2
NITRIC OXIDEApproval

Open Targets known-drugs universe. Drug name and highest clinical stage only — the disease relationship is NOT read from this slice (it carries trial-context noise); approved indications come from the canonical graph above.

Tractability

Small moleculesStrong

Approved Drug and Structure with Ligand support this modality.

Protein degradersEmerging

Feasibility evidence (database ubiquitination and small molecule binder) — no clinical-stage drug of this modality recorded.

View underlying tractability evidence (7)
SM · Approved DrugSM · Structure with LigandSM · High-Quality LigandSM · High-Quality PocketSM · Druggable FamilyPR · Database UbiquitinationPR · Small Molecule Binder

Raw Open Targets tractability assessment buckets, by modality.

Clinical trials

30

Trials of drugs that target this protein — reached indirectly through those drugs, so a trial listed here studies the drug, not the protein. Ranked by active status, then clinical phase and recency, and spread across the targeting drugs.

View all trials (26)

ENROLLING_BY_INVITATION · via methylene blue · NCT06660680

NOT_YET_RECRUITING · via methylene blue · NCT07179003

RECRUITING · via methylene blue · NCT06887036

ACTIVE_NOT_RECRUITING · via Nitric Oxide · NCT03023449

UNKNOWN · via methylene blue · NCT02910765

ClinicalTrials.gov via the drug-target graph.

What's happening now

12

Recent therapeutic activity around this target — regulatory actions, clinical trials and safety signals for 2 drugs that target this protein, plus publications where such a drug is a genuine subject. Every item is reached indirectly through the drug, not the protein itself; incidental mentions (a paper that merely measures a drug) and press items are excluded.

  1. Supplemental approval2026-08-04

    Supplemental approval: RIOCIGUAT (ANDA211135)

    fda · regulatory · fda · via riociguat

  2. Supplemental approval2026-08-04

    Supplemental approval: RIOCIGUAT (NDA204819)

    fda · regulatory · fda · via riociguat

  3. CHMP positive opinion2026-07-20

    CHMP positive opinion: Riociguat Accord (EMA)

    ema · regulatory · ema · via riociguat

  4. Supplemental approval2026-05-08

    Supplemental approval: RIOCIGUAT (ANDA211135)

    fda · regulatory · fda · via riociguat

  5. Supplemental approval2026-05-08

    Supplemental approval: RIOCIGUAT (NDA204819)

    fda · regulatory · fda · via riociguat

  6. New publication2025-04-08
    Understanding chronic inflammation: couplings between cytokines, ROS, NO, Ca<sub>i</sub> <sup>2+</sup>, HIF-1α, Nrf2 and autophagy.

    Frontiers in immunology · 2025 · 37 citations · Europe PMC · via Nitric Oxide

  7. New publication2025-01-01
    Neurological Manifestations Following Traumatic Brain Injury: Role of Behavioral, Neuroinflammation, Excitotoxicity, Nrf-2 and Nitric Oxide.

    CNS & neurological disorders drug targets · 2025 · 5 citations · Europe PMC · via Nitric Oxide

  8. New publication2024-12-11
    Systemic and Cardiac Microvascular Dysfunction in Hypertension.

    International journal of molecular sciences · 2024 · 34 citations · Europe PMC · via Nitric Oxide

  9. New publication2024-08-21
    The Unexpected Role of the Endothelial Nitric Oxide Synthase at the Neurovascular Unit: Beyond the Regulation of Cerebral Blood Flow.

    International journal of molecular sciences · 2024 · 12 citations · Europe PMC · via Nitric Oxide

  10. New publication2024-07-25
    Ca<sup>2+</sup>-dependent phosphodiesterase 1 regulates the plasticity of striatal spiny projection neuron glutamatergic synapses.

    Cell reports · 2024 · 6 citations · Europe PMC · via Nitric Oxide

  11. New publication2024-03-14
    Several lines of antioxidant defense against oxidative stress: antioxidant enzymes, nanomaterials with multiple enzyme-mimicking activities, and low-molecular-weight antioxidants.

    Archives of toxicology · 2024 · 563 citations · Europe PMC · via Nitric Oxide

  12. Safety communication2016-08-08

    Drug Safety Update: Riociguat (Adempas): not for use in patients with pulmonary hypertension associated with idiopathic interstitial pneumonias

    mhra · safety · mhra · via riociguat

Objective event titles are shown unmodified; the event kind and significance line are derived from structured fields. Forefront AttentionEvent stream aggregating Europe PMC Regulatory filings ClinicalTrials.gov.