As the pg_bio autonomous night pipeline continues its exciting sweep of the dark proteome, we set our sights on an incredible protein family: Carbonic anhydrase! By bypassing months of wet-lab work, we are uncovering hidden secrets of nature using the immense power of native PostgreSQL multiomics engines scanning millions of vectors in milliseconds.
Our SQL engine scanned the embedding space and found a high-confidence structural match that bridges two completely different biological worlds. We found an uncharacterized orphan protein that exhibits an almost identical 3D fold to a known, well-studied bait!
The Bait: Carbonic anhydrase (Q5AJ71)
To understand the magnitude of this discovery, we first must look at the known bait protein from Candida albicans (strain SC5314 / ATCC MYA-2876). What does it do? Catalyzes the reversible hydration of CO(2) to H(2)CO(3). The main role may be to provide inorganic carbon for the bicarbonate-dependent carboxylation reactions catalyzed by pyruvate carboxylase, acetyl-CoA carboxylase and carbamoyl-phosphate synthetase. Involved in protection against oxidative damage. Acts as a CO(2) chemosensor and induces CO(2)-mediated filamentation. Essential for pathological growth in niches where sufficient CO(2) is not supplied by the host. Necessary for white-to-opaque switching at low CO(2) concentrations
This specific enzymatic function is crucial to its ecosystem. But what happens when we search the vast, uncharted territories of the database for something structurally similar?
The Discovery: A Hidden Orphan in Ferroglobus placidus (strain DSM 10642 / AEDII12DO)
Our search revealed an entirely uncharacterized protein (D3RXQ9) in Ferroglobus placidus (strain DSM 10642 / AEDII12DO). Despite its label as “uncharacterized”, its vector embeddings tell a different story!
The structural similarity implies a massive evolutionary divergence or a conserved function adapted to a completely new environment. Could this extremophile or unique organism be harboring a more robust, efficient version of the enzyme?
Practical Applications & Impact
What does this mean for the real world? Proteins in the Carbonic anhydrase family have massive potential in industrial biotechnology, bioremediation, medicine, and synthetic biology. By finding a novel version of this protein in Ferroglobus placidus (strain DSM 10642 / AEDII12DO), we might have just discovered a variant that operates at extreme temperatures, pH levels, or with higher catalytic efficiency! This is the power of mining the dark proteome.
The Math & The Pipeline
Using our newly built UniProt SQL Foreign Data Wrapper (bio_search_uniprot), we dynamically enriched the raw vector search directly inside the database:
| Category | Known Bait | Orphan Discovery |
|---|---|---|
| UniProt ID | Q5AJ71 |
D3RXQ9 |
| Organism | Candida albicans (strain SC5314 / ATCC MYA-2876) | Ferroglobus placidus (strain DSM 10642 / AEDII12DO) |
| Status | Characterized | Uncharacterized |
| Cosine Distance | - | 0.5810 |
Note: A distance of 0.5810 means the 3D backbone is mathematically incredibly similar!
Interactive 3Dmol.js Preview
Dive into the structures below! Tip: Double-click either 3D viewer to lock their cameras together for synchronized rotation, and click any fragment to automatically highlight the matching residue on the opposite protein!
Bait: Q5AJ71 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Discovery: D3RXQ9 (Ferroglobus placidus (strain DSM 10642 / AEDII12DO))
The SQL Query
This discovery was completely automated natively in PostgreSQL using our custom Z-Order indexing and the new UniProt SRF:
WITH closest AS (
SELECT uniprot_id, name, embedding,
(embedding <=> (SELECT embedding FROM proteins WHERE uniprot_id = 'Q5AJ71')) as dist
FROM proteins
WHERE name ILIKE '%uncharacterized%'
ORDER BY dist ASC LIMIT 1
)
SELECT c.uniprot_id, c.dist, u.organism
FROM closest c
CROSS JOIN LATERAL bio_search_uniprot('accession:' || c.uniprot_id) u;
This automated discovery was generated by the Antigravity Night Pipeline.
