3W4U

Human zeta-2 beta-2-s hemoglobin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of fully liganded Hb zeta 2 beta 2(s) trapped in a tense conformation

Safo, M.K.Ko, T.-P.Abdulmalik, O.He, Z.Wang, A.H.Schreiter, E.R.Russell, J.E.

(2013) Acta Crystallogr.,Sect.D 69: 2061-2071

  • DOI: 10.1107/S0907444913019197

  • PubMed Abstract: 
  • A variant Hb ζ2β2(s) that is formed from sickle hemoglobin (Hb S; α2β2(s)) by exchanging adult α-globin with embryonic ζ-globin subunits shows promise as a therapeutic agent for sickle-cell disease (SCD). Hb ζ2β2(s) inhibits the polymerization of deo ...

    A variant Hb ζ2β2(s) that is formed from sickle hemoglobin (Hb S; α2β2(s)) by exchanging adult α-globin with embryonic ζ-globin subunits shows promise as a therapeutic agent for sickle-cell disease (SCD). Hb ζ2β2(s) inhibits the polymerization of deoxygenated Hb S in vitro and reverses characteristic features of SCD in vivo in mouse models of the disorder. When compared with either Hb S or with normal human adult Hb A (α2β2), Hb ζ2β2(s) exhibits atypical properties that include a high oxygen affinity, reduced cooperativity, a weak Bohr effect and blunted 2,3-diphosphoglycerate allostery. Here, the 1.95 Å resolution crystal structure of human Hb ζ2β2(s) that was expressed in complex transgenic knockout mice and purified from their erythrocytes is presented. When fully liganded with carbon monoxide, Hb ζ2β2(s) displays a central water cavity, a ζ1-β(s)2 (or ζ2-β(s)1) interface, intersubunit salt-bridge/hydrogen-bond interactions, C-terminal βHis146 salt-bridge interactions, and a β-cleft, that are highly unusual for a relaxed hemoglobin structure and are more typical of a tense conformation. These quaternary tense-like features contrast with the tertiary relaxed-like conformations of the ζ1β(s)1 dimer and the CD and FG corners, as well as the overall structures of the heme cavities. This crystallographic study provides insights into the altered oxygen-transport properties of Hb ζ2β2(s) and, moreover, decouples tertiary- and quaternary-structural events that are critical to Hb ligand binding and allosteric function.


    Organizational Affiliation

    Institute for Structural Biology and Drug Discovery, and the Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit zeta
A, C, E
142Homo sapiensGene Names: HBZ (HBZ2)
Find proteins for P02008 (Homo sapiens)
Go to Gene View: HBZ
Go to UniProtKB:  P02008
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit beta
B, D, F
146Homo sapiensMutations: E6V
Gene Names: HBB
Find proteins for P68871 (Homo sapiens)
Go to Gene View: HBB
Go to UniProtKB:  P68871
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B, C, D, E, F
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CMO
Query on CMO

Download SDF File 
Download CCD File 
A, B, C, D, E, F
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 115.540α = 90.00
b = 115.540β = 90.00
c = 140.900γ = 120.00
Software Package:
Software NamePurpose
d*TREKdata reduction
CNSrefinement
d*TREKdata scaling
CNSphasing
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-06
    Type: Initial release
  • Version 1.1: 2013-10-23
    Type: Database references