Small ribosomal subunit protein mS38 (QRI5) is a 111-residue protein from Saccharomyces cerevisiae (strain ATCC 204508 / S288c). This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P32344.
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The mean pLDDT of this model is 66.0 (low overall). pLDDT is AlphaFold's per-residue confidence score from 0 to 100. In MolViewer, choose the B-factor color scheme to color the model by pLDDT, because AlphaFold stores it in the B-factor column.
| pLDDT band | Meaning | Share of residues |
|---|---|---|
| Above 90 | Very high: backbone and side chains are usually accurate | 24% |
| 70 to 90 | Confident: backbone generally right | 8% |
| 50 to 70 | Low: treat with caution | 54% |
| Below 50 | Very low: often disordered regions | 14% |
What pLDDT means and how to read it
Component of the mitochondrial ribosome (mitoribosome), a dedicated translation machinery responsible for the synthesis of mitochondrial genome-encoded proteins, including at least some of the essential transmembrane subunits of the mitochondrial respiratory chain. The mitoribosomes are attached to the mitochondrial inner membrane and translation products are cotranslationally integrated into the membrane (Probable) (PubMed:30968120). Preferentially stimulates translation initiation of COX1, COX2, and COX3 mRNAs (PubMed:30968120). mS38 is also involved in the splicing of the COX1 mRNA (PubMed:16339141)
Component of the mitochondrial small ribosomal subunit (mt-SSU). Mature yeast 74S mitochondrial ribosomes consist of a small (37S) and a large (54S) subunit. The 37S small subunit contains a 15S ribosomal RNA (15S mt-rRNA) and 34 different proteins. The 54S large subunit contains a 21S rRNA (21S mt-rRNA) and 46 different proteins
Mitochondrion, Mitochondrion inner membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 8OM4 | EM | 2.32 Å | 1=1-111 |
| 8OM2 | EM | 2.57 Å | 1=1-111 |
| 8OM3 | EM | 2.87 Å | 1=1-111 |
| 9HM0 | EM | 3.0 Å | 1=1-111 |
| 8UXA | EM | 3.2 Å | AA=78-111 |
| 9HLZ | EM | 3.2 Å | 1=1-111 |
| 5MRC | EM | 3.25 Å | 11=78-111 |
| 8UX4 | EM | 3.3 Å | AA=78-111 |
| 5MRE | EM | 3.75 Å | 11=78-111 |
| 5MRF | EM | 4.97 Å | 11=78-111 |
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