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 (6112); Uniprot accession (40); PDB accession (32); 3D entries (8); 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
maltose-forming α-amylase (PSMA; Py04_0872)	3.2.1.133	Pyrococcus sp. ST04	AFK22464.1	I3RE04	4CMR[A,B] 1.80	8
bifunctional amylopullulanase cyclomaltodextrinase (Apu-Sm; SMApu; Smar_1407) (intracellular)	3.2.1.1 3.2.1.41 3.2.1.54	Staphylothermus marinus F1	ABN70497.1	A3DPD7	7E1Y[A,B,C,D,E,F,G,H] 2.90	7
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
4-α-glucanotransferase (Jgt)	2.4.1.25	Thermococcus litoralis	BAA22063.1	O32462	1K1W[A] α-D-Glcp 2.80 1K1X[A,B] 2.40 1K1Y[A,B] α-D-Glcp-(1-4)-α-D-Glcp <non_carb>-(1-4)-α-D-6-deoxy-Glcp4N-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp 2.40	1
Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)	Subf
amylopullulanase (AaApu; APU_Aquae; Aq_720)	3.2.1.1 3.2.1.41	Aquifex aeolicus VF5	AAC06900.1 NP_213494.1 WP_010880432.1	O66934	8ZYI[A,B] 9IHT[A,B] 9IHU[A,B] 9IHV[A,B] 9IHW[A,B] 9IHX[A,B] 9II0[A,B] 9II1[A,B] 9JLQ[A,B,C,D] 9JLR[A,B,C,D] 9JLS[A,B,C,D] 9JLT[A,B] 9JLU[A] 9JLV[A] 9JLW[A,B] 9K7C[A,B,C,D] 9K7D[A,B] 9KYP[A,B,C,D] 9KYQ[A,B] 9KYR[A,B,C,D]	2
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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