6HD1

human STEAP4 bound to NADPH, FAD and heme.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Cryo-EM structures of human STEAP4 reveal mechanism of iron(III) reduction.

Oosterheert, W.van Bezouwen, L.S.Rodenburg, R.N.P.Granneman, J.Forster, F.Mattevi, A.Gros, P.

(2018) Nat Commun 9: 4337-4337

  • DOI: https://doi.org/10.1038/s41467-018-06817-7
  • Primary Citation of Related Structures:  
    6HCY, 6HD1

  • PubMed Abstract: 
  • Enzymes of the six-transmembrane epithelial antigen of the prostate (STEAP) family reduce Fe 3+ and Cu 2+ ions to facilitate metal-ion uptake by mammalian cells. STEAPs are highly upregulated in several types of cancer, making them potential therapeutic targets ...

    Enzymes of the six-transmembrane epithelial antigen of the prostate (STEAP) family reduce Fe 3+ and Cu 2+ ions to facilitate metal-ion uptake by mammalian cells. STEAPs are highly upregulated in several types of cancer, making them potential therapeutic targets. However, the structural basis for STEAP-catalyzed electron transfer through an array of cofactors to metals at the membrane luminal side remains elusive. Here, we report cryo-electron microscopy structures of human STEAP4 in absence and presence of Fe 3+ -NTA. Domain-swapped, trimeric STEAP4 orients NADPH bound to a cytosolic domain onto axially aligned flavin-adenine dinucleotide (FAD) and a single b-type heme that cross the transmembrane-domain to enable electron transfer. Substrate binding within a positively charged ring indicates that iron gets reduced while in complex with its chelator. These molecular principles of iron reduction provide a basis for exploring STEAPs as therapeutic targets.


    Organizational Affiliation

    Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands. p.gros@uu.nl.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Metalloreductase STEAP4A [auth C],
B [auth A],
C [auth B]
459Homo sapiensMutation(s): 0 
Gene Names: STEAP4STAMP2TNFAIP9
EC: 1.16.1 (PDB Primary Data), 1.16.1.9 (UniProt)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q687X5 (Homo sapiens)
Explore Q687X5 
Go to UniProtKB:  Q687X5
PHAROS:  Q687X5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ687X5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FAD (Subject of Investigation/LOI)
Query on FAD

Download Ideal Coordinates CCD File 
F [auth C],
K [auth A],
P [auth B]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
NAP (Subject of Investigation/LOI)
Query on NAP

Download Ideal Coordinates CCD File 
D [auth C],
I [auth A],
N [auth B]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
E [auth C],
J [auth A],
O [auth B]
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
44E
Query on 44E

Download Ideal Coordinates CCD File 
H [auth C],
M [auth A],
R [auth B]
(2R)-3-(phosphonooxy)propane-1,2-diyl dihexanoate
C15 H29 O8 P
SFZZRGHNPILUOD-CYBMUJFWSA-N
 Ligand Interaction
NAG
Query on NAG

Download Ideal Coordinates CCD File 
G [auth C],
L [auth A],
Q [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION2.1b1

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Netherlands Organisation for Scientific ResearchNetherlands731.015.201
European UnionNetherlands653706
Italian Association for Cancer ResearchItalyIG19808

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2018-10-31
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-06
    Changes: Data collection, Refinement description
  • Version 1.3: 2019-12-11
    Changes: Other
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary