Mechanism	Retaining a
Clan	GH-T
3D Structure Status	( β / α ) 7 barrel
Catalytic Nucleophile/Base	Glu
Catalytic Proton Donor	Asp
Note	Subfamilies established in (Polacek et al., 2025) [PMID:40187459]
External resources	CAZypedia;
Statistics	GenBank accession (1); Uniprot accession (5); PDB accession (7); 3D entries (4); cryst (0)

Archaea
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)	Subf
glycogen branching enzyme (GBE;PhGBE;PH1386)	3.2.1.1 2.4.1.18	Pyrococcus horikoshii OT3	BAA30492.1 NP_143265.1	O50094	5WU7[A,B] 2.31	5
branching enzyme (TkGBE; TkGBE57; TkGBE57; TK1436)	2.4.1.18	Thermococcus kodakarensis KOD1	BAD85625.1 CAT71088.1 WP_011250387.1	Q5JDJ7	3N8T[A] 2.40 3N92[A] β-D-Glcp 2.89 3N98[A] β-D-Glcp 1.87	5
Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)	Subf
α-1,4-glucan branching enzyme / α-amylase (AmyC; GBE; TmGBE57; TM1438)	3.2.1.1 2.4.1.18	Thermotoga maritima MSB8	AHD18669.1 AGL50368.1 AKE29197.1 QFD27285.1 WP_004081707.1	R4P360	2B5D[X] 2.20	5
glycogen branching enzyme (GBE; TtGBE; TtGBE57; TTHA1902; TT1467)	2.4.1.18	Thermus thermophilus HB8	BAD71725.1	Q5SH28	1UFA[A] 2.20 3P0B[A] 1.35	5
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