Mechanism	Inverting e
3D Structure Status	6-stranded β-barrel
Catalytic Nucleophile/Base	Asp (experimental)
Catalytic Proton Donor	Asp (experimental).
Note	formerly known as cellulase family K; distantly related to plant expansins. Subfamiles established in (Hornung and Terrapon, 2024) [PMID:37585436]
External resources	CAZypedia; Expansin; PROSITE;
Statistics	GenBank accession (131); Uniprot accession (9); PDB accession (7); 3D entries (2); cryst (0)

Eukaryota
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)	Subf
endo-β-1,4-glucanase (EG27II)	3.2.1.4	Ampullaria crossean	ABR92638.1	A7KMF0	5XBU[A] 1.00 5XBX[A] β-D-Glcp-(1-4)-β-D-Glcp 1.04 5XC4[A] β-D-Glcp-(1-4)-β-D-Glcp 1.42 5XC8[A] β-D-Glcp-(1-4)-β-D-Glcp 1.45 5XC9[A] β-D-Glcp-(1-4)-β-D-Glcp 1.28 5XCA[A] β-D-Glcp-(1-4)-β-D-Glcp 1.35	2
endoglucanase (Eg)	3.2.1.4	Mytilus edulis	CAC59695.1 CAC59694.1	P82186 Q95P02	1WC2[A] 1.2	2
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