P63220: Small ribosomal subunit protein eS21 (RPS21)

Small ribosomal subunit protein eS21 (RPS21) is a 83-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P63220.

Gene: RPS21
Organism: Homo sapiens
Length: 83 residues
Mean pLDDT: 95.5
Model: AF-P63220-F1 v6
Model created: 1 Aug 2025
PDB structures: 184

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Model confidence (pLDDT)

The mean pLDDT of this model is 95.5 (very high 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	98%
70 to 90	Confident: backbone generally right	2%
50 to 70	Low: treat with caution	0%
Below 50	Very low: often disordered regions	0%

What pLDDT means and how to read it

Function

Component of the small ribosomal subunit (PubMed:23636399, PubMed:25901680, PubMed:25957688). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:23636399, PubMed:25901680, PubMed:25957688)

Subunit structure

Component of the 40S small ribosomal subunit

Subcellular location

Cytoplasm, cytosol, Cytoplasm, Rough endoplasmic reticulum

Experimental structures in the PDB

Compare the prediction with experimentally determined structures of the same protein:

PDB ID	Method	Resolution	Chains and residues
8GLP	EM	1.67 Å	SV=1-83
8QOI	EM	1.9 Å	SV=1-83
9O3W	EM	1.9 Å	SV=1-83
8YOO	EM	2.0 Å	SV=1-83
9C3H	EM	2.0 Å	SV=1-83
7R4X	EM	2.15 Å	V=1-83
9I2D	EM	2.19 Å	SV=1-83
9PBE	EM	2.19 Å	SV=1-83
8YOP	EM	2.2 Å	SV=1-83
9O3Y	EM	2.2 Å	SV=1-83
8JDK	EM	2.26 Å	AH=1-83
8G5Y	EM	2.29 Å	SV=1-83
9S3D	EM	2.32 Å	SV=1-83
9RPV	EM	2.35 Å	RV/SV=1-83
9S3B	EM	2.38 Å	SV=1-83
8K2C	EM	2.4 Å	SV=1-83
8XSX	EM	2.4 Å	SV=1-83
9SPF	EM	2.4 Å	SV=1-83
9SPI	EM	2.4 Å	SV=1-83
8JDL	EM	2.42 Å	AH=1-83

Showing 20 of 184 experimental structures (best resolution first).

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