EFI - Enzyme Similarity Tool

This web resource is supported by a Research Resource from the National Institute of General Medical Sciences (R24GM141196-01).

The tools are available without charge or license to both academic and commercial users.

Important Notice

The UniProtKB database used by the EFI tools is undergoing major reorganization starting with the just-released version 2025_04 (https://www.uniprot.org/help/refprot_only_changes). When the reorganization is fully implemented (2026_02 release, Spring 2026), the number of proteins in UniProtKB will decrease from ~253M accessions in the previous 2025_03 release to ~141M accessions in the 2026_02 release.

In response to these changes, we will provide the previous 2025_03 release until the 2026_02 release is available.

The current 2025_04 release removed 82M UniProt IDs; the UniProt pages providing functional annotation for these IDs are no longer active. A new Metadata Tool provides access to the node attribute metadata for all UniProt IDs in the 2025_03 release that the tools continue to use during the UniProtKB reorganization. The Tool is available using the tab at the top of each page.

More information about the reorganization is located here.

Download Network Files

Submission Name: IP91_IPR004184_UniRef90_NoFragments

Network Name: IP91_IPR004184_UniRef90_NoFragments_Minlen650_AS210

SSN Overview
Network Files

The parameters used for the initial submission and the finalization are summarized in the table below.

Analysis Summary

Analysis Job Number	26587
Network Name	IP91_IPR004184_UniRef90_NoFragments_Minlen650_AS210
Alignment Score	210
Minimum Length	650
Maximum Length	50,000
Total Number of Sequences After Filtering	5,801

Dataset Summary

EST Job Number	26123 (Original Dataset)
Database Version	UniProt: 2022-04 / InterPro: 91
Input Option	Families (Option B)
Job Name	IP91_IPR004184_UniRef90_NoFragments
E-Value for SSN Edge Calculation	5
Pfam / InterPro Family	IPR004184
Number of IDs in Pfam / InterPro Family	25,513
Domain Option	off
UniRef Version	90
Number of Cluster IDs in UniRef90 Family	6,937
Exclude Fragments	Yes
Total Number of Sequences in Dataset	6,937
Total Number of Edges	20,962,994
Number of Unique Sequences	6,937
Convergence Ratio?	0.871

Please cite your use of the EFI tools:

Rémi Zallot, Nils Oberg, and John A. Gerlt, The EFI Web Resource for Genomic Enzymology Tools: Leveraging Protein, Genome, and Metagenome Databases to Discover Novel Enzymes and Metabolic Pathways. Biochemistry 2019 58 (41), 4169-4182. https://doi.org/10.1021/acs.biochem.9b00735

Nils Oberg, Rémi Zallot, and John A. Gerlt, EFI-EST, EFI-GNT, and EFI-CGFP: Enzyme Function Initiative (EFI) Web Resource for Genomic Enzymology Tools. J Mol Biol 2023. https://doi.org/10.1016/j.jmb.2023.168018

The panels below provide files for full and representative node SSNs for download with the indicated numbers of nodes and edges. As an approximate guide, SSNs with ~2M edges can be opened with 16 GB RAM, ~5M edges can be opened with 32 GB RAM, ~10M edges can be opened with 64 GB RAM, ~20M edges can be opened with 128 GB RAM, ~40M edges can be opened with 256 GB RAM, and ~120M edges can be opened with 768 GB RAM.

Files may be transferred to the Genome Neighborhood Tool (GNT), the Color SSN utility, the Cluster Analysis utility, or the Neighborhood Connectivity utility.

Full Network ?

Each node in the network represents a single protein sequence.

	# Nodes	# Edges
	5,801	2,471,535

Representative Node Networks ?

In representative node (RepNode) networks, each node in the network represents a collection of proteins grouped according to percent identity. For example, for a 75% identity RepNode network, all connected sequences that share 75% or more identity are grouped into a single node (meta node). Sequences are collapsed together to reduce the overall number of nodes, making for less complicated networks easier to load in Cytoscape.

The cluster organization is not changed, and the clustering of sequences remains identical to the full network.

% ID	# Nodes	# Edges
100	5,801	2,471,535
95	5,772	2,430,421
90	5,681	2,303,638
85	4,964	1,497,508
80	4,264	898,464
75	3,708	528,152
70	3,184	288,352
65	2,762	152,398
60	2,400	69,657
55	2,162	38,517
50	1,983	26,656
45	1,879	23,275
40	1,728	20,952

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Portions of these data are derived from the Universal Protein Resource (UniProt) databases.

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