Annotations: 8EE1

KS-AT didomain from module 2 of the 6-deoxyerythronolide B synthase in complex with antibody fragment AA5

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	Polyketide_cyc2	e8ee1C1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)
F [auth H]	Polyketide_cyc2	e8ee1H1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)
B	Polyketide_cyc2	e8ee1B1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)
E [auth G]	Polyketide_cyc2	e8ee1G1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)
A	Polyketide_cyc2	e8ee1A1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)
D	Polyketide_cyc2	e8ee1D1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F: Polyketide_cyc2	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
E [auth G]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	3.40.47.10	Alpha Beta	3-Layer(aba) Sandwich	Peroxisomal Thiolase	Chain A, domain 1	CATH (utative)
D	3.40.47.10	Alpha Beta	3-Layer(aba) Sandwich	Peroxisomal Thiolase	Chain A, domain 1	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C, F [auth H]	Light Chain	IGKV3	Kappa	6-deoxyerythronolide b synthase	SAbDab (2026-05-08)
B, E [auth G]	Heavy Chain	IGHV4	-	6-deoxyerythronolide b synthase	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, F [auth H]	AA5 antibody light chain	-	-	-
B, E [auth G]	AA5 antibody heavy chain	-	-	-
A, D	6-deoxyerythronolide B synthase	acyltransferase activity erythronolide synthase activity acyltransferase activity, transferring groups other than amino-acyl groups transferase activity catalytic activity vitamin binding modified amino acid binding binding ion binding anion binding phosphopantetheine binding sulfur compound binding small molecule binding fatty acid synthase activity acyltransferase activity erythronolide synthase activity acyltransferase activity, transferring groups other than amino-acyl groups transferase activity catalytic activity vitamin binding modified amino acid binding binding ion binding anion binding phosphopantetheine binding sulfur compound binding small molecule binding fatty acid synthase activity 3-oxoacyl-[acyl-carrier-protein] synthase activity	fatty acid metabolic process monocarboxylic acid biosynthetic process small molecule biosynthetic process oxoacid 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 small molecule metabolic process metabolic process fatty acid metabolic process monocarboxylic acid biosynthetic process small molecule biosynthetic process oxoacid 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 small molecule metabolic process metabolic process cellular process monocarboxylic acid metabolic process lipid metabolic process macrolide biosynthetic process polyketide metabolic process macrolide metabolic process secondary metabolic process antibiotic biosynthetic process antibiotic metabolic process polyketide biosynthetic process secondary metabolite biosynthetic process lactone metabolic process lactone biosynthetic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, D	IPR014031	Beta-ketoacyl synthase, C-terminal domain	Domain
A, D	IPR016035	Acyl transferase/acyl hydrolase/lysophospholipase	Homologous Superfamily
A, D	IPR006162	Phosphopantetheine attachment site	PTM
A, D	IPR032821	Polyketide synthase, C-terminal extension	Domain
A, D	IPR057326	Ketoreductase domain	Domain
A, D	IPR009081	Phosphopantetheine binding ACP domain	Domain
A, D	IPR020806	Polyketide synthase-like, phosphopantetheine-binding domain	Domain
A, D	IPR014030	Beta-ketoacyl synthase-like, N-terminal domain	Domain
A, D	IPR013968	Polyketide synthase-like, ketoreductase domain	Domain
A, D	IPR016039	Thiolase-like	Homologous Superfamily
A, D	IPR001227	Acyl transferase domain superfamily	Homologous Superfamily
A, D	IPR016036	Malonyl-CoA ACP transacylase, ACP-binding	Homologous Superfamily
A, D	IPR036291	NAD(P)-binding domain superfamily	Homologous Superfamily
A, D	IPR050091	Polyketide and Nonribosomal Peptide Biosynthesis Enzymes	Family
A, D	IPR018201	Beta-ketoacyl synthase, active site	Active Site
A, D	IPR020841	Polyketide synthase, beta-ketoacyl synthase domain	Domain
A, D	IPR036736	ACP-like superfamily	Homologous Superfamily
A, D	IPR014043	Acyl transferase domain	Domain

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.