Small nuclear ribonucleoprotein-associated proteins B and B' (SNRPB) is a 240-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P14678.
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The mean pLDDT of this model is 69.5 (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 | 27% |
| 70 to 90 | Confident: backbone generally right | 12% |
| 50 to 70 | Low: treat with caution | 47% |
| Below 50 | Very low: often disordered regions | 14% |
What pLDDT means and how to read it
Plays a role in pre-mRNA splicing as a core component of the spliceosomal U1, U2, U4 and U5 small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome (PubMed:11991638, PubMed:18984161, PubMed:19325628, PubMed:25555158, PubMed:26912367, PubMed:28076346, PubMed:28502770, PubMed:28781166, PubMed:32494006). Component of both the pre-catalytic spliceosome B complex and activated spliceosome C complexes (PubMed:11991638, PubMed:28076346, PubMed:28502770, PubMed:28781166). As a component of the minor spliceosome, involved in the splicing of U12-type introns in pre-mRNAs (PubMed:15146077). As part of the U7 snRNP it is involved in histone pre-mRNA 3'-end processing…
Core component of the spliceosomal U1, U2, U4 and U5 small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome (PubMed:10025403, PubMed:11991638, PubMed:19325628, PubMed:21516107, PubMed:25555158, PubMed:26912367, PubMed:28076346, PubMed:28502770, PubMed:28781166, PubMed:32494006, PubMed:36797247). Most spliceosomal snRNPs contain a common set of Sm proteins, SNRPB,…
Cytoplasm, cytosol, Nucleus
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 1D3B | X-ray | 2.0 Å | B/D/F/H/J/L=1-91 |
| 7EVO | EM | 2.5 Å | f=1-240 |
| 8H6L | EM | 2.6 Å | 2a/4a/5a=1-229 |
| 8H6K | EM | 2.7 Å | 2a/4a/5a=1-229 |
| 8HK1 | EM | 2.7 Å | f=1-240 |
| 8C6J | EM | 2.8 Å | b/k=1-240 |
| 9NH5 | EM | 2.82 Å | B=1-95 |
| 9NH6 | EM | 2.82 Å | B=1-95 |
| 6ID1 | EM | 2.86 Å | b/i=1-229 |
| 7DVQ | EM | 2.89 Å | b/i=1-240 |
| 6ID0 | EM | 2.9 Å | b/i=1-229 |
| 6QW6 | EM | 2.92 Å | 4b/5b=1-240 |
| 6ICZ | EM | 3.0 Å | b/i=1-229 |
| 7VPX | EM | 3.0 Å | f/k=1-240 |
| 8I0R | EM | 3.0 Å | a/m=1-240 |
| 8I0T | EM | 3.0 Å | a/m=1-240 |
| 8I0V | EM | 3.0 Å | a/m=1-240 |
| 9GCL | EM | 3.0 Å | k=1-240 |
| 7QTT | EM | 3.1 Å | n=1-240 |
| 8Q91 | EM | 3.1 Å | h=1-240 |
Showing 20 of 74 experimental structures (best resolution first).
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