2P4A | pdb_00002p4a

X-ray structure of a camelid affinity matured single-domain vhh antibody fragment in complex with RNASE A

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
D	d2p4ad_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	Arabian camel (Camelus dromedarius ) [TaxId: 9838 ],	SCOPe (2.08)
B	d2p4ab_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	Arabian camel (Camelus dromedarius ) [TaxId: 9838 ],	SCOPe (2.08)
C	d2p4ac_	Alpha and beta proteins (a+b)	RNase A-like	RNase A-like	Ribonuclease A-like	automated matches	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)
A	d2p4aa_	Alpha and beta proteins (a+b)	RNase A-like	RNase A-like	Ribonuclease A-like	automated matches	(Bos taurus ) [TaxId: 9913 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	RNase A-like	8038165	3001918	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	RNase A-like	8038165	3001918	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)
D	PK_Tyr_Ser-Thr	e2p4aD1	A: alpha bundles	X: HTH	H: Nudix	T: Nudix	F: PK_Tyr_Ser-Thr	ECOD (develop294)
B	SspB	e2p4aB1	A: alpha bundles	X: Profilin-like	H: sensor domains	T: sensor domains	F: SspB	ECOD (develop294)
C	RnaseA	e2p4aC1	A: alpha bundles	X: EGF-like	H: LDL receptor-like module	T: LDL receptor-like module	F: RnaseA	ECOD (develop294)
A	RnaseA	e2p4aA1	A: alpha bundles	X: EGF-like	H: LDL receptor-like module	T: LDL receptor-like module	F: RnaseA	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	3.10.130.10	Alpha Beta	Roll	P-30 Protein	Ribonuclease A-like domain	CATH (4.3.0)
A	3.10.130.10	Alpha Beta	Roll	P-30 Protein	Ribonuclease A-like domain	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B, D	Cab-RN05	VH	Camelus dromedarius (Arabian camel)	IGHV3S4501, IGHJ301	V-DOMAIN VH	IG	(VH)	IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, D	Heavy Chain	IGHV1	-	ribonuclease pancreatic	SAbDab (2026-03-20)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF00074	Pancreatic ribonuclease (RnaseA)	Pancreatic ribonuclease	Ribonucleases. Members include pancreatic RNAase A and angiogenins. Structure is an alpha+beta fold -- long curved beta sheet and three helices.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B, D	ANTIBODY CAB-RN05	-	response to stimulus immune response immune system process adaptive immune response	protein-containing complex immunoglobulin complex cellular anatomical structure extracellular region
A, C	Ribonuclease pancreatic	phosphorus-oxygen lyase activity endonuclease activity nuclease activity ribonuclease A activity catalytic activity, acting on RNA RNA endonuclease activity catalytic activity, acting on a nucleic acid RNA nuclease activity lyase activity catalytic activity hydrolase activity binding nucleic acid binding	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to Gram-positive bacterium response to external stimulus response to biotic stimulus defense response to bacterium response to bacterium response to stress response to external biotic stimulus	cellular anatomical structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B, D	IPR050199	Immunoglobulin Heavy Variable	Family
B, D	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B, D	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B, D	IPR013106	Immunoglobulin V-set domain	Domain
B, D	IPR003599	Immunoglobulin domain subtype	Domain
B, D	IPR007110	Immunoglobulin-like domain	Domain
A, C	IPR023412	Ribonuclease A-domain	Domain
A, C	IPR036816	Ribonuclease A-like domain superfamily	Homologous Superfamily
A, C	IPR001427	Pancreatic ribonuclease	Family
A, C	IPR023411	Ribonuclease A, active site	Active Site

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.