Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyN-lobe and C-lobe of Tf-binding protein B-like 8047017 4006246 SCOP2 (2022-06-29)
ASCOP2 FamilyN-lobe and C-lobe of Tf-binding protein B-like 8048878 4006246 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyTbpB N-lobe and C-lobe beta-barrel domains-like 8052208 3002098 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyTbpB N-lobe and C-lobe beta-barrel domains-like 8047026 3002098 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyTbpB N-lobe and C-lobe handle domains-like 8052209 3002099 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyTbpB N-lobe and C-lobe handle domains-like 8052210 3002099 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyTbpB N-lobe and C-lobe handle domains-like 8052209 3002099 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTbpB N-lobe and C-lobe beta-barrel domains-like 8052208 3002098 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTbpB N-lobe and C-lobe beta-barrel domains-like 8047026 3002098 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ATbpB_Ae3v8uA4 A: beta barrelsX: Handle domain in transferrin-binding protein B (From Topology)H: Handle domain in transferrin-binding protein B (From Topology)T: Handle domain in transferrin-binding protein BF: TbpB_AECOD (1.6)
ATbpB_C_1e3v8uA5 A: beta barrelsX: Handle domain in transferrin-binding protein B (From Topology)H: Handle domain in transferrin-binding protein B (From Topology)T: Handle domain in transferrin-binding protein BF: TbpB_C_1ECOD (1.6)
ATbpB_B_De3v8uA1 A: beta barrelsX: Outer membrane meander beta-barrelsH: OMPA-like (From Topology)T: OMPA-likeF: TbpB_B_DECOD (1.6)
BTbpB_Ae3v8uB1 A: beta barrelsX: Handle domain in transferrin-binding protein B (From Topology)H: Handle domain in transferrin-binding protein B (From Topology)T: Handle domain in transferrin-binding protein BF: TbpB_AECOD (1.6)
BTbpB_C_1e3v8uB4 A: beta barrelsX: Handle domain in transferrin-binding protein B (From Topology)H: Handle domain in transferrin-binding protein B (From Topology)T: Handle domain in transferrin-binding protein BF: TbpB_C_1ECOD (1.6)
BTbpB_B_De3v8uB3 A: beta barrelsX: Outer membrane meander beta-barrelsH: OMPA-like (From Topology)T: OMPA-likeF: TbpB_B_DECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.40.128.250 Mainly Beta Beta Barrel Lipocalin CATH (4.3.0)
A2.40.160.90 Mainly Beta Beta Barrel Porin CATH (4.3.0)
A2.40.128.240 Mainly Beta Beta Barrel Lipocalin CATH (4.3.0)
B2.40.128.250 Mainly Beta Beta Barrel Lipocalin CATH (4.3.0)
B2.40.160.90 Mainly Beta Beta Barrel Porin CATH (4.3.0)
B2.40.128.240 Mainly Beta Beta Barrel Lipocalin CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF17483C-lobe handle domain of Tf-binding protein B (TbpB_C)C-lobe handle domain of Tf-binding protein BBacterial lipoproteins represent a large group of specialised membrane proteins that perform a variety of functions including maintenance and stabilization of the cell envelope, protein targeting and transit to the outer membrane, membrane biogenesis ...Bacterial lipoproteins represent a large group of specialised membrane proteins that perform a variety of functions including maintenance and stabilization of the cell envelope, protein targeting and transit to the outer membrane, membrane biogenesis, and cell adherence [1]. Pathogenic Gram-negative bacteria within the Neisseriaceae and Pasteurellaceae families rely on a specialised uptake system, characterized by an essential surface receptor complex that acquires iron from host transferrin (Tf) and transports the iron across the outer membrane. They have an iron uptake system composed of surface exposed lipoprotein, Tf-binding protein B (TbpB), and an integral outer-membrane protein, Tf-binding protein A (TbpA), that together function to extract iron from the host iron binding glycoprotein (Tf). TbpB is a bilobed (N and C lobe) lipid-anchored protein with each lobe consisting of an eight-stranded beta barrel flanked by a 'handle' domain made up of four (N lobe) or eight (C lobe) beta strands [2]. TbpB extends from the outer membrane surface by virtue of an N-terminal peptide region that is anchored to the outer membrane by fatty acyl chains on the N-terminal cysteine and is involved in the initial capture of iron-loaded Tf [3]. This domain family is found in the handle domain of the C lobe (domain C) of TbpB proteins. It consists of a squashed six-stranded beta sheet flanked by two antiparallel beta strands and has no supporting alpha helix as in the N lobe [2].
Domain
A, B
PF01298C-lobe and N-lobe beta barrels of Tf-binding protein B (TbpB_B_D)C-lobe and N-lobe beta barrels of Tf-binding protein BBacterial lipoproteins represent a large group of specialized membrane proteins that perform a variety of functions including maintenance and stabilization of the cell envelope, protein targeting and transit to the outer membrane, membrane biogenesis ...Bacterial lipoproteins represent a large group of specialized membrane proteins that perform a variety of functions including maintenance and stabilization of the cell envelope, protein targeting and transit to the outer membrane, membrane biogenesis, and cell adherence [1]. Pathogenic Gram-negative bacteria within the Neisseriaceae and Pasteurellaceae families rely on a specialized uptake system, characterized by an essential surface receptor complex that acquires iron from host transferrin (Tf) and transports the iron across the outer membrane. They have an iron uptake system composed of surface exposed lipoprotein, Tf-binding protein B (TbpB), and an integral outer-membrane protein, Tf-binding protein A (TbpA), that together function to extract iron from the host iron binding glycoprotein (Tf). TbpB is a bilobed (N and C lobe) lipid-anchored protein with each lobe consisting of an eight-stranded beta barrel flanked by a "handle" domain made up of four (N lobe) or eight (C lobe) beta strands [2]. TbpB extends from the outer membrane surface by virtue of an N-terminal peptide region that is anchored to the outer membrane by fatty acyl chains on the N-terminal cysteine and is involved in the initial capture of iron-loaded Tf [3]. This domain family is found in C and N lobe eight stranded beta barrel region of TbpB proteins. The eight-stranded barrel domains in N and C lobe draw comparisons to eight-stranded beta barrel outer-membrane protein W (OmpW). However, the barrel domains of TbpB have the hydrophobic residues line the inner surface of the beta barrels to create a stable hydrophobic core [2].
Domain