coproporphyrinogen I
Enable an agent to identify coproporphyrinogen I, assess whether a sample still represents that substance, and judge its suitability for biochemical measurement or use.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 26 questions
Chemical identity Define which molecular entity the registry entry denotes.
Macrocycle and substituents
Specify the structural features that establish the I isomer.
Type-I structure
Require a numbered structure connecting porphyrinogen reduction state with the repeating type-I side-chain arrangement.
- Which atom-numbered structure and structure identifier establish coproporphyrinogen I? definition
- Which structural observations distinguish this material from coproporphyrinogen III and coproporphyrin I? boundary
Identifier and form mapping
Connect registry identity to external records without conflating chemical forms.
Verified record equivalence
Reconcile names and database identifiers against structures; KEGG lists coproporphyrinogen I as C05768. [KEGG pathway](https://www.genome.jp/dbget-bin/www_bget?pathway%3Ahsa00860=)
- Which CAS, PubChem, ChEBI and EC identifiers can be verified for this exact structure, and which remain unavailable? provenance
- Does each linked record describe the parent acid, an ionic form, a salt or an oxidized derivative? boundary
Preparation composition Describe how much intact target substance a preparation contains.
Chemical form and medium
Record the material form and conditions underlying concentration claims.
Form-dependent quantity
Tie amounts to the stated protonation, counterions, solvent and concentration basis.
- What chemical form, solvent composition and pH describe the preparation? definition
- How was intact coproporphyrinogen I concentration determined, including corrections for counterions, solvent and impurities? measurement
Impurity profile
Separate target material from related tetrapyrroles and preparation residues.
Resolved purity
Assess isomeric contamination, oxidation products, residual precursor and incompletely decarboxylated material separately.
- What fractions are coproporphyrinogen III, coproporphyrin I, uroporphyrinogen I or partially decarboxylated intermediates? measurement
- Which impurity and residual-reagent limits are required for the intended enzyme or analytical experiment? action
Redox integrity and preservation Determine whether preparation and handling preserve the intended analyte.
Conversion history
Track possible chemical change from preparation through measurement.
Oxidation accounting
Require evidence about conversion to coproporphyrin I and other products during the sample's history.
- How much intact porphyrinogen remains at preparation, assay start and assay completion? measurement
- Which observed products arose before sampling, during extraction or during intentional analytical conversion? provenance
Validated handling window
Connect storage and handling choices to measured integrity.
Condition-specific stability
Treat acceptable temperature, atmosphere, light exposure and holding time as conditions requiring validation.
- What stability and recovery measurements support the chosen container, atmosphere, light protection and temperature? measurement
- What elapsed time or integrity threshold triggers remeasurement, repreparation or rejection? action
Analytical recognition Establish what an analytical result actually identifies and quantifies.
Isomer-specific identification
Evaluate evidence capable of separating I from III.
Orthogonal identity evidence
Combine structure-sensitive or separation-based evidence with composition measurements.
- Which validated separation or structural method distinguishes the I and III isomers in this matrix? measurement
- What independently characterized reference material supports the peak or structure assignment? provenance
Measurement basis
Separate direct analyte measurements from measurements made after chemical conversion.
Direct versus converted signal
Make explicit whether the reported result measures intact porphyrinogen or a derivative used to infer its amount.
- Does the method measure intact coproporphyrinogen I, coproporphyrin I after oxidation, or a combined pool? boundary
- How are pre-existing coproporphyrin I, conversion yield, extraction recovery and measurement uncertainty accounted for? measurement
Biochemical context and use Connect this substance to evidenced reactions and experimental decisions.
Formation and fate
Record organism-specific precursor and transformation relationships.
Isomer-specific pathway role
UROD annotations distinguish formation of the I isomer from the III-isomer route that can proceed to heme. [UniProt UROD](https://www.uniprot.org/uniprotkb/Q5T446/entry)
- Which organism, enzyme and experimental evidence establish formation from uroporphyrinogen I? provenance
- Which downstream reactions are demonstrated or excluded for the I isomer in the biological system being modeled? boundary
Experimental fitness
Determine whether a preparation supports a specified biochemical use.
Use-specific acceptance
Separate evidence of binding from evidence of catalytic conversion; a UROD complex with coproporphyrinogen I is recorded as 1R3Q. [NCBI structure](https://www.ncbi.nlm.nih.gov/Structure/pdb/1R3Q)
- Does the intended experiment require a ligand, reaction product, analytical standard or demonstrated enzyme substrate? action
- Which controls establish that the observed effect comes from intact coproporphyrinogen I rather than oxidation products, other isomers or preparation reagents? measurement
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of coproporphyrinogen I this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
Coproporphyrinogen I is a reduced cyclic tetrapyrrole with four methyl and four propionate side chains in the type-I arrangement, formed by decarboxylation of uroporphyrinogen I and unable to proceed through the normal heme biosynthetic pathway.
In scope
- Type-I substitution pattern and reduced porphyrinogen identity
- Protonation, counterions, concentration and sample composition
- Distinction from coproporphyrinogen III and coproporphyrin I
- Formation from uroporphyrinogen I and evidence about subsequent transformations
- Sample preservation, analytical recovery and fitness for experimental use
Out of scope
- Independent models of coproporphyrinogen III or coproporphyrin I
- The complete heme biosynthesis pathway
- Uroporphyrinogen decarboxylase structure and enzyme engineering
- Diagnosis and treatment of porphyrias
- Commercial reagent formulations and analytical instruments as products
Why it exists Filled
Enable an agent to identify coproporphyrinogen I, assess whether a sample still represents that substance, and judge its suitability for biochemical measurement or use.
Distinguishing features Filled
- Establish the type-I side-chain arrangement: repeating methyl-propionate pairs around the macrocycle, rather than the type-III arrangement with one reversed pair.
- Establish the reduced porphyrinogen state independently of isomer identity; coproporphyrin I is the corresponding oxidized porphyrin.
- Confirm four methyl and four propionate side chains, distinguishing it from uroporphyrinogen I and incompletely decarboxylated intermediates.
- Require isomer-resolving evidence: molecular mass alone cannot distinguish coproporphyrinogen I from coproporphyrinogen III.
What robots and AI may and may not do Filled
Must not
- Diagnose a person with a porphyria from symptoms or a single result.
- Interpret a patient's porphyrin tests outside a qualified laboratory or clinician.
- Share a person's test results or diagnosis beyond those entitled to them.
Only with a human decision
- Any diagnostic or treatment decision for a suspected porphyria.
May
- Describe coproporphyrinogen I and its role in heme pathway disorders from biochemical sources.
- Explain in general terms why type I isomers build up in certain porphyrias.
Moral aspects Filled
- Porphyrias are rare and often misdiagnosed, causing long suffering.
- Genetic diagnoses affect whole families and must stay private.
Who is affected
- Patients with porphyria
- Their families
Owners Filled
Steward
Nobody owns the molecule; clinical laboratories answer for its measurement.
Master systems
- Metabolic pathway and compound databases
Links to other meta-models Filled
parent
- Q193430 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.coproporphyrinogen-i
- Wikidata: Q2468963 (https://www.wikidata.org/wiki/Q2468963)
Direct properties required Filled
- Constitutional isomer assignment: Type I confirmed; mixed isomers; unresolved
- Porphyrinogen integrity: Reduced form confirmed; partially oxidized; oxidized; unresolved
- Chemical form: Free acid or specified ionic form, counterions and solvation
- Coproporphyrinogen I concentration: mol/L with method, uncertainty and measurement time
- Isomeric and redox purity: mol% or mass%, with denominator and resolved impurity identities
- Sample environment: Solvent or matrix, pH, temperature in °C, atmosphere, light exposure and elapsed time
- Formation relationship: Precursor, enzyme, organism and supporting reaction evidence
Recognition required Filled
- Not visible; measured as its oxidized porphyrin in urine or stool by laboratory tests.
Capabilities and actions required Filled
- Match a proposed identity to a structure-resolved chemical record.
- Assess whether a preparation contains intact coproporphyrinogen I at the required purity.
- Select an assay that resolves type-I identity and accounts for oxidation during measurement.
- Track preparation, storage and handling against an experimentally established stability window.
- Relate measured material to precursor conversion or enzyme-binding experiments.
- Accept, remeasure or reject a sample using use-specific integrity and uncertainty criteria.
Hazards and failure modes required Filled
- Wrong interpretation of porphyrin results leads to misdiagnosis.
Standards and interfaces required Filled
- The Globally Harmonized System of Classification and Labelling of Chemicals, issued by the United Nations, provides the framework for assessing and communicating chemical hazards where implemented.
Context of use required Filled
- Coproporphyrinogen I is encountered in research on porphyrin metabolism and biochemical pathways associated with heme production.
- It may be studied in biological samples or reference preparations where distinguishing the reduced compound from its oxidation products is essential.
Sources Filled
- Wikidata item Q2468963: coproporphyrinogen I - identity and sense of the item
- Wikipedia: Coproporphyrinogen I - general description of the item
Open questions
- Which CAS, PubChem, ChEBI and EC records unambiguously identify the parent substance and its separately indexed ionic forms?
- What experimentally supported solubility, acid-base and thermal data exist for defined forms, and are melting or boiling measurements meaningful before decomposition?
- What preservation conditions and maximum holding times retain quantified porphyrinogen integrity in relevant matrices?
- Which validated assays distinguish native coproporphyrinogen I from pre-existing coproporphyrin I and oxidation introduced during preparation?
- What substance-specific hazard classifications, exposure limits and handling evidence are available, separately from solvent hazards and evidence about oxidized porphyrins?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q2468963/spec.json