NOD1

Gene versus protein boundary

Document why this entry is interpreted as a receptor protein and retain the encoding gene as a linked entity.

1. Does the registry's originating identifier denote NOD1 protein, its gene or a combined gene-product concept? boundary
2. Which original registry or external record supports the chosen interpretation? provenance

Ortholog, isoform and construct

Record species, accession, isoform and experimental sequence changes before transferring functional expectations.

1. Which organism, protein accession and sequence version identify this NOD1? definition
2. Which substitutions, deletions, tags or isoform differences separate the observed material from that reference? measurement

Domain retention and alteration

Associate each retained or altered region with the function actually tested.

1. Are the CARD, nucleotide-binding region and LRR region present and intact in this NOD1 sequence? measurement
2. Which functional conclusions remain justified if a region is deleted or mutated? boundary

Evidence for a competent molecular state

Record nucleotide and assembly observations without equating either automatically with activity.

1. What assay establishes NOD1 nucleotide binding or occupancy under the reported conditions? measurement
2. What distinguishes the observed NOD1 oligomers from insoluble or nonspecific aggregates? measurement
3. What independent evidence links this molecular state to signaling competence? provenance

Diaminopimelate stimulus specificity

Distinguish chemically defined NOD1 stimuli from mixed bacterial preparations and NOD2 comparator ligands.

1. What exact chemical structure, stereochemistry and purity define the tested iE-DAP-containing stimulus? definition
2. Which controls distinguish NOD1-associated recognition from NOD2 responses or contaminating stimulants? measurement

Delivery and response boundary

Keep extracellular dose, intracellular access and receptor recognition as separate observations.

1. How was the stimulus delivered, and what supports its access to intracellular NOD1? provenance
2. How does the response vary with dose, exposure duration and delivery method? measurement
3. Does the experiment establish direct molecular binding or only NOD1-dependent cellular responsiveness? boundary

Abundance and localization

Distinguish measured NOD1 protein from transcript proxies and expression-system effects.

1. What NOD1 protein abundance and distribution were measured in the specified cell type and condition? measurement
2. Is the evidence from endogenous protein, overexpression or transcript abundance alone? provenance

Coupling versus output

Treat RIP2 association as a distinct observation from successful NOD1 signaling. [NOD1-RIP2 experimental study](https://pmc.ncbi.nlm.nih.gov/articles/PMC4132792/)

1. What evidence demonstrates NOD1-RIPK2 association or RIPK2 dependence in this system? measurement
2. Which downstream endpoint was measured, at what time, and relative to which baseline? measurement
3. What establishes that the endpoint reflects NOD1 activity rather than another convergent pathway? boundary

Identity and integrity controls

Record specificity evidence for detection and integrity evidence for functional material.

1. How was the NOD1 antibody or detection reagent validated against NOD1-deficient material or an independent method? provenance
2. What confirms the preparation's NOD1 identity, full-length status, purity and retained activity? measurement
3. Which measurements remain valid if identity is established but functional integrity is uncertain? action

NOD1-specific intervention evidence

Require controls that distinguish changes to NOD1 from changes to delivery, viability or shared signaling machinery.

1. Which loss-of-function and rescue comparisons support a causal contribution from NOD1? action
2. Does the perturbation act on NOD1 itself, its expression, ligand delivery or a shared downstream component? boundary
3. Which viability, expression and comparator-pathway controls are needed before interpreting the effect? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of NOD1 this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of NOD1 this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of NOD1 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.

1. Which of these failure modes and hazards hold for the sense of NOD1 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.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of NOD1 this model covers, and on what evidence? provenance