Literature summary for 2.4.1.25 extracted from

Przylas, I.; Tomoo, K.; Terada, Y.; Takaha, T.; Fujii, K.; Saenger, W.; Strater, N.
Crystal structure of amylomaltase from Thermus aquaticus, a glycosyltransferase catalyzing the production of large cyclic glucans (2000), J. Mol. Biol., 296, 873-886.

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Cloned(Commentary)

Cloned (Comment)	Organism
-	Chlamydia pneumoniae
-	Clostridium butyricum
genes for amylomaltase are part of the glycogen operon	Aquifex aeolicus
genes for amylomaltase are part of the glycogen operon	Haemophilus influenzae
seuence determined	Escherichia coli

Crystallization (Commentary)

Crystallization (Comment)	Organism
crystals belong to space group P6(4) with cell parameters a = b = 154 A and c = 64 A	Thermus aquaticus

Natural Substrates/ Products (Substrates)

Natural Substrates	Organism	Comment (Nat. Sub.)	Natural Products	Comment (Nat. Pro.)	Rev.	Reac.
maltopentaose + maltopentaose	Thermus aquaticus	metabolism of starch in the bacterium	maltooligosaccharides	-	?
maltopentaose + maltopentaose	Escherichia coli	metabolism of starch in the bacterium	maltooligosaccharides	-	?

Organism

Organism	UniProt	Comment	Textmining
Aquifex aeolicus	-	-	-
Chlamydia pneumoniae	-	-	-
Clostridium butyricum	-	-	-
Escherichia coli	-	-	-
Haemophilus influenzae	-	-	-
Solanum tuberosum	-	-	-
Thermus aquaticus	-	-	-

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
(alpha-1,4-D-glucan)m + (alpha-1,4-D-glucan)m	-	Escherichia coli	cyclic(alpha-1,4-glucan)x + (alpha-1,4-D-glucan)m-x	-	r
(alpha-1,4-D-glucan)m + (alpha-1,4-D-glucan)m	-	Solanum tuberosum	cyclic(alpha-1,4-glucan)x + (alpha-1,4-D-glucan)m-x	-	r
(alpha-1,4-D-glucan)m + (alpha-1,4-D-glucan)n	-	Escherichia coli	(alpha-1,4-D-glucan)m-x + (alpha-1,4-D-glucan)n+x	-	r
(alpha-1,4-D-glucan)m + (alpha-1,4-D-glucan)n	-	Solanum tuberosum	(alpha-1,4-D-glucan)m-x + (alpha-1,4-D-glucan)n+x	-	r
(alpha-1,4-D-glucan)m + H2O	-	Escherichia coli	(alpha-1,4-D-glucan)x + (alpha-1,4-D-glucan)m-x	-	r
(alpha-1,4-D-glucan)m + H2O	-	Solanum tuberosum	(alpha-1,4-D-glucan)x + (alpha-1,4-D-glucan)m-x	-	r
amylose + maltopentaose	-	Thermus aquaticus	cyclic alpha-1,4-glucan	cycloamylose	?
amylose + maltopentaose	-	Solanum tuberosum	cyclic alpha-1,4-glucan	cycloamylose	?
maltopentaose + maltopentaose	metabolism of starch in the bacterium	Thermus aquaticus	maltooligosaccharides	-	?
maltopentaose + maltopentaose	metabolism of starch in the bacterium	Escherichia coli	maltooligosaccharides	-	?

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Release 2026.1 (March 2026)