N400D

Category 3/4 — Most DruggableUncertain significanceTransmembrane · predictedSource card

Asparagine → Aspartic acid at position 400 · Cytoplasmic loop 2 · WFS1 (Wolframin)

Interactive 3D Structure

Wild-type reference

Wild-type N400 — hydrogen bond to K256

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DynaMut2 mutant · N400D

Mutant D400 — hydrogen bond to K256 lost (3 contacts lost)

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Bond changes · DynaMut2 interaction analysis

3 lost2 gained3 preserved

Interaction type	Wild-type partner	Mutant partner	Status
Hydrogen bond	K256	—	Lost
Hydrogen bond	N396	N396	Preserved
Polar contact	K256	—	Lost
Polar contact	N396	N396	Preserved
Polar contact	F397	F397	Preserved
Polar contact	—	L402	Gained
Van der Waals	—	G257	Gained
Van der Waals	N396	—	Lost

Lost / gained / preserved interatomic contacts at the variant residue, from the DynaMut2 (Arpeggio) interaction analysis of the wild-type and energy-minimized mutant structures.

Computational Predictions

DynaMut2 ΔΔG

-0.23kcal/mol

Destabilising — mild

AlphaMissense

0.601

likely pathogenic

AlphaFold pLDDT

model confidence

Schema

Cat 3/4

Category 3/4 — Most Druggable

Clinical Evidence

ClinVar classificationUncertain significance

Review statuscriteria provided, single submitter

Associated conditions—

Population frequency (gnomAD v4)Ultra-rare · AF 0.00014%

cDNA changec.1198A>G

ClinVar accessionVCV002106804

Last evaluated2022/03/14 00:00

Observed at very low frequency in gnomAD.

Full Variant Card

WFS1 Wolframin — N400D Variant Card

Molecular Atlas Pilot · RareResearch.AI · Generated by wolfram-variant-card skill

Asparagine → Aspartic acid at position 400. Cytoplasmic loop 2. ClinVar Uncertain significance, AlphaMissense 0.601, DynaMut2 ΔΔG -0.23 kcal/mol (destabilising).

Identity

Field	Value
Variant	N400D (p.Asparagine400Aspartic acid)
DNA change	c.1198A>G
Gene · Protein	WFS1 · Wolframin (890 aa)
UniProt	O76024 · WFS1_HUMAN
ClinVar accession	VCV002106804
Amino acid change	Asparagine (N) → Aspartic acid (D)

Structural Context

Field	Value
AlphaFold model	AF-O76024-F1, v6
pLDDT at residue 400	79.81 — well-folded
Domain	Cytoplasmic loop 2
Position context	Loop region · position 400 sits between transmembrane segments, solvent-accessible
IDR flag	No — pLDDT above 50 threshold

UniProt features at this position:

(none catalogued)

Position 400 sits in a connecting loop between transmembrane helices. Loop residues are typically solvent-exposed and often contribute to interhelical contacts or serve as recognition sites for binding partners. The wild-type residue is polar amide (asparagine — H-bond donor/acceptor); the mutant is negatively charged (aspartate — carboxylate). The chemistry shift implies altered local packing, hydrogen-bonding, and/or electrostatics at this site.

Computational Predictions

AlphaMissense

Field	Value
am_pathogenicity	0.6009
am_class	likely pathogenic
Interpretation	Likely pathogenic (threshold 0.564)

DynaMut2

Field	Value
ΔΔG (kcal/mol)	-0.23 (Destabilising)
Job ID	178092132166
Result URL	https://biosig.lab.uq.edu.au/dynamut2/results_prediction/178092132166

Clinical Evidence

Field	Value
Classification	Uncertain significance
Review status	criteria provided, single submitter
Last evaluated	2022/03/14 00:00
Inheritance	Inheritance pattern not specified in ClinVar entry; WFS1 has both AD and AR presentations.
WFS1 variant landscape	N400D is 1 of ~326 pathogenic-spectrum variants in WFS1 (out of 2,243 catalogued in ClinVar)

(no conditions catalogued)

Research Path Decision Tree

ΔΔG < 2  + binding site affected   →  CATEGORY 3 — docking experiments
ΔΔG 2–4                            →  CATEGORY 2 — pharmacological chaperones
ΔΔG > 4                            →  CATEGORY 1 — gene therapy
pLDDT < 50                         →  CATEGORY 5 — IDR, experimental only
Stable fold + functional site hit  →  CATEGORY 4 — site-specific docking

Final Schema Categorization

Category 3/4 — Most Druggable

<strong>Category 3/4 — Most Druggable</strong><br/><br/>|ΔΔG|=0.23 < 2 kcal/mol (fold intact) + AlphaMissense 0.601 confirms functional impact. Specific local contacts disrupted — priority for docking and pharmacological chaperone screening.

Why this card matters. Wolframin's fold survives this substitution (|ΔΔG|=0.23 kcal/mol). The pathogenic signal is real — AlphaMissense places it at 0.601. Protein still folds, but a specific local site is broken. Pharmacological chaperones and small-molecule binders are the rational therapeutic vector.

Files in this folder

AF-O76024-F1-model_v6.pdb — AlphaFold structure
N400D_molstar_viewer.html — interactive 3D viewer (auto-highlights position 400 with ball-and-stick + neighbors within 5Å)
N400D_variant_card.md — this card (source of truth)
N400D_variant_card.html — styled printable card
N400D_dynamut2_summary.html — clean offline DynaMut2 result card
dynamut2_result.json — structured result data
dynamut2_result_page.html — local snapshot of the Biosig result page (asset URLs absolutized)
N400D_wildtype_interactions.pse / N400D_mutant_interactions.pse — PyMOL sessions

Generated by wolfram-variant-card skill · RareResearch.AI Molecular Atlas Every assumption documented. Every score sourced.

Therapeutic Strategy Handoff · prediction

Feed this card to Wolfram Intelligence

Download the N400D PDF below and upload it to Wolfram Intelligence to generate therapeutic-strategy proposals — guanidinium mimetics, sigma-1 agonist docking, NAC thiol-capping. NAC is already on the bench-testing list.

Download N400D PDF card ↓Strategies are AI-generated predictions, not validated therapeutics.