2BQ8

Crystal structure of human purple acid phosphatase with an inhibitory conformation of the repression loop


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structures of Recombinant Human Purple Acid Phosphatase with and without an Inhibitory Conformation of the Repression Loop.

Strater, N.Jasper, B.Scholte, M.Krebs, B.Duff, A.P.Langley, D.B.Han, R.Averill, B.A.Freeman, H.C.Guss, J.M.

(2005) J.Mol.Biol. 351: 233

  • DOI: 10.1016/j.jmb.2005.04.014
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The crystal structure of human purple acid phosphatase recombinantly expressed in Escherichia coli (rHPAP(Ec)) and Pichia pastoris (rHPAP(Pp)) has been determined in two different crystal forms, both at 2.2A resolution. In both cases, the enzyme crys ...

    The crystal structure of human purple acid phosphatase recombinantly expressed in Escherichia coli (rHPAP(Ec)) and Pichia pastoris (rHPAP(Pp)) has been determined in two different crystal forms, both at 2.2A resolution. In both cases, the enzyme crystallized in its oxidized (inactive) state, in which both Fe atoms in the dinuclear active site are Fe(III). The main difference between the two structures is the conformation of the enzyme "repression loop". Proteolytic cleavage of this loop in vivo or in vitro results in significant activation of the mammalian PAPs. In the crystals obtained from rHPAP(Ec), the carboxylate side-chain of Asp145 of this loop acts as a bidentate ligand that bridges the two metal atoms, in a manner analogous to a possible binding mode for a phosphate ester substrate in the enzyme-substrate complex. The carboxylate side-chain of Asp145 and the neighboring Phe146 side-chain thus block the active site, thereby inactivating the enzyme. In the crystal structure of rHPAP(Pp), the enzyme "repression loop" has an open conformation similar to that observed in other mammalian PAP structures. The present structures demonstrate that the repression loop exhibits significant conformational flexibility, and the observed alternate binding mode suggests a possible inhibitory role for this loop.


    Organizational Affiliation

    Biotechnologisch-Biomedizinisches Zentrum, Fakultät für Chemie und Mineralogie der Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TARTRATE-RESISTANT ACID PHOSPHATASE TYPE 5
X
304Homo sapiensMutation(s): 0 
Gene Names: ACP5
EC: 3.1.3.2
Find proteins for P13686 (Homo sapiens)
Go to Gene View: ACP5
Go to UniProtKB:  P13686
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
X
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
X
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
FE2
Query on FE2

Download SDF File 
Download CCD File 
X
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.181 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 94.756α = 90.00
b = 94.756β = 90.00
c = 144.007γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-24
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2019-07-24
    Type: Data collection