3SAO | pdb_00003sao

Experimental Data Snapshot

Starting Models: experimental
View more details

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.2 of the entry. See complete history.

(2011) Structure 19: 1796-1806

PubMed Abstract:
Galline Ex-FABP was identified as another candidate antibacterial, catecholate siderophore binding lipocalin (siderocalin) based on structural parallels with the family archetype, mammalian Siderocalin. Binding assays show that Ex-FABP retains iron in a siderophore-dependent manner in both hypertrophic and dedifferentiated chondrocytes, where Ex-FABP expression is induced after treatment with proinflammatory agents, and specifically binds ferric complexes of enterobactin, parabactin, bacillibactin and, unexpectedly, monoglucosylated enterobactin, which does not bind to Siderocalin. Growth arrest assays functionally confirm the bacteriostatic effect of Ex-FABP in vitro under iron-limiting conditions. The 1.8 Å crystal structure of Ex-FABP explains the expanded specificity, but also surprisingly reveals an extended, multi-chambered cavity extending through the protein and encompassing two separate ligand specificities, one for bacterial siderophores (as in Siderocalin) at one end and one specifically binding copurified lysophosphatidic acid, a potent cell signaling molecule, at the other end, suggesting Ex-FABP employs dual functionalities to explain its diverse endogenous activities.

Organizational Affiliation

Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

Macromolecule Content

Find similar proteins by:

| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Extracellular fatty acid-binding protein	A, B	160	Gallus gallus	Mutation(s): 3 Gene Names: EXFABP
UniProt
Find proteins for P21760 (Gallus gallus) Explore P21760 Go to UniProtKB: P21760
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P21760
Sequence Annotations Expand
Reference Sequence

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NKN Query on NKN Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth B] MOL2 format, chain C [auth A] MOL2 format, chain D [auth B] mmCIF format, chain C [auth A] mmCIF format, chain D [auth B]	C [auth A], D [auth B]	(2R)-2-hydroxy-3-(phosphonooxy)propyl tetradecanoate C₁₇ H₃₅ O₇ P FAZBDRGXCKPVJU-MRXNPFEDSA-N		Interactions Focus chain C [auth A] Focus chain D [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth B]
DBH Query on DBH Download:Ideal Coordinates CCD File SDF format, chain E [auth B] MOL2 format, chain E [auth B] mmCIF format, chain E [auth B]	E [auth B]	2,3-DIHYDROXY-BENZOIC ACID C₇ H₆ O₄ GLDQAMYCGOIJDV-UHFFFAOYSA-N		Interactions Focus chain E [auth B] Interactions & Density Focus chain E [auth B]
GOL Query on GOL Download:Ideal Coordinates CCD File SDF format, chain G [auth B] MOL2 format, chain G [auth B] mmCIF format, chain G [auth B]	G [auth B]	GLYCEROL C₃ H₈ O₃ PEDCQBHIVMGVHV-UHFFFAOYSA-N		Interactions Focus chain G [auth B] Interactions & Density Focus chain G [auth B]
FE Query on FE Download:Ideal Coordinates CCD File SDF format, chain F [auth B] MOL2 format, chain F [auth B] mmCIF format, chain F [auth B]	F [auth B]	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N		Interactions Focus chain F [auth B] Interactions & Density Focus chain F [auth B]

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Software Package:

Deposition Author(s):

Correnti, C.

Version 1.0: 2011-12-28
Type: Initial release
Version 1.1: 2023-09-13
Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary
Version 1.2: 2024-11-27
Changes: Structure summary