Annotations: 9NWW

Single-particle cryo-EM structure of the first variant of mobilized colistin resistance (MCR-1) in its ligand-bound state

External Resource: Annotation

AMR Gene: CARD Annotation
AMR Gene Family: CARD Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

AMR Gene: CARD Annotation CARD Database Homepage

Chains	Accession	Short Name	Description	Provenance Source (Version)
A [auth B]	ARO:3003689	MCR-1.1	MCR-1 is a plasmid-borne phosphoethanolamine transferase that interferes with binding of colistin to the cell membrane via addition of phosphoethanolamine to lipid A, resulting reduction in negative charge of the cell membrane.	CARD (4.0.1)

AMR Gene Family: CARD Annotation CARD Database Homepage

Chains	Accession	Gene Family	Drug Class	Resistance Machanism	Provenance Source (Version)
A [auth B]	ARO:3004268	MCR phosphoethanolamine transferase	peptide antibiotic	antibiotic target alteration	CARD (4.0.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth C]	Light Chain	IGKV1	Kappa	probable phosphatidylethanolamine transferase mcr-1	SAbDab (2026-05-15)
C [auth D]	Heavy Chain	IGHV3	-	probable phosphatidylethanolamine transferase mcr-1	SAbDab (2026-05-15)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B]	Probable phosphatidylethanolamine transferase Mcr-1	transferase activity catalytic activity phosphotransferase activity, phosphate group as acceptor transferase activity, transferring phosphorus-containing groups cation binding ion binding binding metal ion binding small molecule binding	lipopolysaccharide biosynthetic process carbohydrate derivative biosynthetic process carbohydrate metabolic process polysaccharide biosynthetic process carbohydrate biosynthetic process oligosaccharide metabolic process liposaccharide metabolic process lipid biosynthetic process carbohydrate derivative metabolic process primary metabolic process macromolecule biosynthetic process lipopolysaccharide metabolic process lipopolysaccharide core region biosynthetic process polysaccharide metabolic process biosynthetic process lipopolysaccharide biosynthetic process carbohydrate derivative biosynthetic process carbohydrate metabolic process polysaccharide biosynthetic process carbohydrate biosynthetic process oligosaccharide metabolic process liposaccharide metabolic process lipid biosynthetic process carbohydrate derivative metabolic process primary metabolic process macromolecule biosynthetic process lipopolysaccharide metabolic process lipopolysaccharide core region biosynthetic process polysaccharide metabolic process biosynthetic process oligosaccharide biosynthetic process metabolic process cellular process macromolecule metabolic process lipid metabolic process response to stimulus response to chemical response to antibiotic	cell periphery cellular anatomical structure plasma membrane membrane
B [auth C]	Fab (MR6) Light (L) Chain	-	-	-
C [auth D]	Fab (MR6) Heavy (H) Chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth B]	IPR040423	Phosphoethanolamine transferase	Family
A [auth B]	IPR058130	Phosphoethanolamine transferase, C-terminal domain	Domain
A [auth B]	IPR012549	Phosphoethanolamine transferase, N-terminal	Domain
A [auth B]	IPR058128	Phosphatidylethanolamine transferase Mcr-1	Family
A [auth B]	IPR000917	Sulfatase, N-terminal	Domain
A [auth B]	IPR017850	Alkaline-phosphatase-like, core domain superfamily	Homologous Superfamily

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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.