Annotations: 8W5E

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B [auth c]	SCOP2B Superfamily	RNA bacteriophage capsid protein	8035305	3001853	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	RNA bacteriophage capsid protein	8035305	3001853	SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A [auth H]	Heavy Chain	IGHV5	-	minor capsid protein a1 \| unknown	SAbDab (2025-09-26)
D [auth L]	Light Chain	IGKV17	Kappa	minor capsid protein a1 \| unknown	SAbDab (2025-09-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
B [auth c], C	PF01819	Levivirus coat protein (Levi_coat)	Levivirus coat protein	The Levivirus coat protein forms the bacteriophage coat that encapsidates the viral RNA. 180 copies of this protein form the virion shell. The MS2 bacteriophage coat protein controls two distinct processes: sequence-specific RNA encapsidation and re ...	The Levivirus coat protein forms the bacteriophage coat that encapsidates the viral RNA. 180 copies of this protein form the virion shell. The MS2 bacteriophage coat protein controls two distinct processes: sequence-specific RNA encapsidation and repression of replicase translation-by binding to an RNA stem-loop structure of 19 nucleotides containing the initiation codon of the replicase gene. The binding of a coat protein dimer to this hairpin shuts off synthesis of the viral replicase, switching the viral replication cycle to virion assembly rather than continued replication [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth H]	Heavy chain of Ab4	-	-	-
B [auth c], C	Minor capsid protein A1	structural molecule activity translation regulator activity translation repressor activity RNA binding binding nucleic acid binding	-	viral capsid T=3 icosahedral viral capsid icosahedral viral capsid virion component
D [auth L]	Light chain of Ab4	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B [auth c], C	IPR002703	Levivirus coat protein	Family
B [auth c], C	IPR015954	Bacteriophage RNA-type, capsid	Homologous Superfamily

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A [auth H]	SEP	Parent Component: SER RESID: AA0037 PSI-MOD : O-phospho-L-serine MOD:00046
D [auth L]	SEP	Parent Component: SER RESID: AA0037 , AA0037 PSI-MOD : O-phospho-L-serine MOD:00046 , O-phospho-L-serine MOD:00046

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.