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 6CA9 | pdb_00006ca9

Crystal structure of Fab PCT64_LMCA (SAR), the least mutated common ancestor of the HIV-1 broadly neutralizing antibody lineage PCT64

External Resource: Annotation


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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Cd6ca9c1 All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin V set domains (antibody variable domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)
Cd6ca9c2 All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin C1 set domains (antibody constant domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)
Ad6ca9a1 All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin V set domains (antibody variable domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)
Ad6ca9a2 All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin C1 set domains (antibody constant domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)
Dd6ca9d_ All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin V set domains (antibody variable domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)
Bd6ca9b_ All beta proteins Immunoglobulin-like beta-sandwich Immunoglobulin V set domains (antibody variable domain-like) automated matches (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
CY_phosphatasee6ca9C1 A: alpha arraysX: fingers domain in bacteriophage RB69-like DNA polymerase IH: fingers domain in bacteriophage RB69-like DNA polymerase IT: fingers domain in bacteriophage RB69-like DNA polymerase IF: Y_phosphataseECOD (v295.2)
AY_phosphatasee6ca9A1 A: alpha arraysX: fingers domain in bacteriophage RB69-like DNA polymerase IH: fingers domain in bacteriophage RB69-like DNA polymerase IT: fingers domain in bacteriophage RB69-like DNA polymerase IF: Y_phosphataseECOD (v295.2)
DY_phosphatasee6ca9D1 A: alpha arraysX: fingers domain in bacteriophage RB69-like DNA polymerase IH: fingers domain in bacteriophage RB69-like DNA polymerase IT: fingers domain in bacteriophage RB69-like DNA polymerase IF: Y_phosphataseECOD (v295.2)
BY_phosphatasee6ca9B1 A: alpha arraysX: fingers domain in bacteriophage RB69-like DNA polymerase IH: fingers domain in bacteriophage RB69-like DNA polymerase IT: fingers domain in bacteriophage RB69-like DNA polymerase IF: Y_phosphataseECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
C2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
A2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
D2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (utative)
B2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (utative)

IMGT Antibody Annotation IMGT Database Homepage

ChainProtein NameDescriptionOrganism NameGene Allele Name(s)Domain Name(s)Receptor TypeReceptor DescriptionProvenance Source
A, C
Fab PCT64_LMCA (SAR), broadly neutralizing antibody L-KAPPA Homo sapiens (human) IGKV3-20*01, IGKJ3*01, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202638-0)
B, D
Fab PCT64_LMCA (SAR), broadly neutralizing antibody VH-CH1 Homo sapiens (human) IGHV3-15*01, IGHV3-15*05, IGHJ6*04, IGHG1*01, IGHG1*02, IGHG1*04, IGHG1*05 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202638-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
A, C
Light ChainIGKV3 Kappa-SAbDab (2026-10-02)
B, D
Heavy ChainIGHV3 --SAbDab (2026-10-02)

Protein Modification Annotation

Modified Residue(s)
ChainResidue(s)Description
B, D
TYS Parent Component: TYR

:  AA0172

:  O4'-sulfo-L-tyrosine MOD:00181