1U5U

The structure of an Allene Oxide Synthase reveals a novel use for a catalase fold

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: OPM
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1u5ua_	Multi-domain proteins (alpha and beta)	Heme-dependent catalase-like	Heme-dependent catalase-like	Allene oxide synthase	Allene oxide synthase-lipoxygenase protein, N-terminal domain	(Plexaura homomalla ) [TaxId: 47982 ],	SCOPe (2.08)
B	d1u5ub_	Multi-domain proteins (alpha and beta)	Heme-dependent catalase-like	Heme-dependent catalase-like	Allene oxide synthase	Allene oxide synthase-lipoxygenase protein, N-terminal domain	(Plexaura homomalla ) [TaxId: 47982 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Allene oxide synthase	8030397	4003889	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Heme-dependent catalase-like	8042776	3001681	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Heme-dependent catalase-like	8042776	3001681	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Catalase	e1u5uA1	A: beta barrels	X: Barrel domain in heme-dependent catalases (From Topology)	H: Barrel domain in heme-dependent catalases (From Topology)	T: Barrel domain in heme-dependent catalases	F: Catalase	ECOD (1.6)
A	catalase_like	e1u5uA2	A: alpha bundles	X: First alpha-helical domain in heme-dependent catalases (From Topology)	H: First alpha-helical domain in heme-dependent catalases (From Topology)	T: First alpha-helical domain in heme-dependent catalases	F: catalase_like	ECOD (1.6)
B	Catalase	e1u5uB1	A: beta barrels	X: Barrel domain in heme-dependent catalases (From Topology)	H: Barrel domain in heme-dependent catalases (From Topology)	T: Barrel domain in heme-dependent catalases	F: Catalase	ECOD (1.6)
B	catalase_like	e1u5uB2	A: alpha bundles	X: First alpha-helical domain in heme-dependent catalases (From Topology)	H: First alpha-helical domain in heme-dependent catalases (From Topology)	T: First alpha-helical domain in heme-dependent catalases	F: catalase_like	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.180.10	Mainly Beta	Beta Barrel	Catalase HpII, Chain A, domain 1	Catalase core domain	CATH (4.3.0)
B	2.40.180.10	Mainly Beta	Beta Barrel	Catalase HpII, Chain A, domain 1	Catalase core domain	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Allene oxide synthase-lipoxygenase protein	binding organic cyclic compound binding tetrapyrrole binding heme binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding hydro-lyase activity lyase activity allene oxide synthase activity catalytic activity binding organic cyclic compound binding tetrapyrrole binding heme binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding small molecule binding hydro-lyase activity lyase activity allene oxide synthase activity catalytic activity carbon-oxygen lyase activity oxidoreductase activity, acting on single donors with incorporation of molecular oxygen, incorporation of two atoms of oxygen oxidoreductase activity oxidoreductase activity, acting on single donors with incorporation of molecular oxygen arachidonate 8(R)-lipoxygenase activity dioxygenase activity	fatty acid metabolic process monocarboxylic acid biosynthetic process small molecule biosynthetic process oxoacid metabolic process cellular biosynthetic process cellular metabolic process carboxylic acid metabolic process lipid biosynthetic process primary metabolic process organic acid biosynthetic process organic acid metabolic process fatty acid biosynthetic process carboxylic acid biosynthetic process biosynthetic process cellular lipid metabolic process fatty acid metabolic process monocarboxylic acid biosynthetic process small molecule biosynthetic process oxoacid metabolic process cellular biosynthetic process cellular metabolic process carboxylic acid metabolic process lipid biosynthetic process primary metabolic process organic acid biosynthetic process organic acid metabolic process fatty acid biosynthetic process carboxylic acid biosynthetic process biosynthetic process cellular lipid metabolic process small molecule metabolic process metabolic process cellular process monocarboxylic acid metabolic process lipid metabolic process icosanoid metabolic process long-chain fatty acid metabolic process unsaturated fatty acid metabolic process arachidonate metabolic process olefinic compound metabolic process lipid modification lipid oxidation oxylipin metabolic process oxylipin biosynthetic process	membrane cellular anatomical entity intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR020834	Lipoxygenase, conserved site	Conserved Site
A, B	IPR020835	Catalase superfamily	Homologous Superfamily
A, B	IPR036392	PLAT/LH2 domain superfamily	Homologous Superfamily
A, B	IPR001024	PLAT/LH2 domain	Domain
A, B	IPR036226	Lipoxigenase, C-terminal domain superfamily	Homologous Superfamily
A, B	IPR000907	Lipoxygenase	Family
A, B	IPR020833	Lipoxygenase, iron binding site	Binding Site
A, B	IPR013819	Lipoxygenase, C-terminal	Domain
A, B	IPR001885	Lipoxygenase, mammalian	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B	OPM	Monotopic/peripheral	All alpha monotopic/peripheral	Lipoxygenase	Lipoxygenases

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	hydroperoxide dehydratase M-CSA #758	Coral allene oxide synthase (cAOS) is a fusion protein with 8R-lipoxygenase (LOX) from Plexura homomalia. cAOS is a hemoprotein with sequence homology to catalase, and is involved in the catalysis of the production of an unstable epoxide (an allene oxide) from the fatty acid hydroperoxide generated by the lipoxygenase activity (8R-HPETE). Despite the sequence homology to catalase, cAOS does not exhibit catalase activity as is does not catalyse the dismutation of hydrogen peroxide to water.	Defined by 4 residues: THR:A-66HIS:A-67ASN:A-137TYR:A-353 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 4.2.1.92 (PDB Primary Data) Search M-CSA Motif + EC 4.2.1.92 EC: 4.2.1 (UniProt) Search M-CSA Motif + EC 4.2.1 EC: 1.13.11.40 (UniProt) Search M-CSA Motif + EC 1.13.11.40

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.