1G41 | pdb_00001g41

CRYSTAL STRUCTURE OF HSLU HAEMOPHILUS INFLUENZAE

• PDB DOI: https://doi.org/10.2210/pdb1G41/pdb

• Classification: CHAPERONE
• Organism(s): Haemophilus influenzae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2000-10-25 Released: 2000-11-22 
• Deposition Author(s): Trame, C.B., McKay, D.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.276 (Depositor), 0.236 (DCC) 
• R-Value Work: 
  0.264 (Depositor), 0.208 (DCC) 
• R-Value Observed: 
  0.264 (Depositor) 

Starting Model: experimental

Literature

Structure of Haemophilus influenzae HslU protein in crystals with one-dimensional disorder twinning.

Trame, C.B., McKay, D.B.

(2001) Acta Crystallogr D Biol Crystallogr 57: 1079-1090

• PubMed: 11468391 
• DOI: https://doi.org/10.1107/s0907444901007673
• Primary Citation Related Structures: 
  1G41, 1IM2


• PubMed Abstract: 
  

  The structure of the Haemophilus influenzae HslU protein, a molecular chaperone of the Clp/Hsp100 family, has been solved to 2.3 A by molecular replacement using a model of the homologous Escherichia coli protein. The crystals in which the structure was solved have an unusual twinning, or one-dimensional disorder, in which each successive crystal-packing layer is displaced laterally relative to the one below it. A model for the twinning and an algorithm for detwinning the data are described. It is known from other work that when the HslU hexamer binds its cognate protease HslV, the carboxy-terminal helices of HslU protomers distend and bind between HslV subunits. Comparison of HslU alone with its structure in the HslUV complex reveals several conserved amino-acid residues whose side-chain interactions differ between the two structures, suggesting that they may be part of a conformational switch that facilitates the release of the HslU carboxy-terminal helices when HslV binds.

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Organizational Affiliation: 
• Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C6  (Explore in 3D)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 49.96 kDa 
• Atom Count: 2,726 
• Modeled Residue Count: 334 
• Deposited Residue Count: 444 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT SHOCK PROTEIN HSLU	A	444	Haemophilus influenzae	Mutation(s): 0  Gene Names: HSLU
UniProt
Find proteins for P43773 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)) Explore P43773  Go to UniProtKB:  P43773

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	C [auth A]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
SO4	B [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.276 (Depositor), 0.236 (DCC) 
• R-Value Work:  0.264 (Depositor), 0.208 (DCC) 
• R-Value Observed: 0.264 (Depositor) 

Space Group: P 6 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 110.62	α = 90
b = 110.62	β = 90
c = 335.83	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-11-22 
Deposition Author(s): Trame, C.B., McKay, D.B.

Revision History  

• Version 1.0: 2000-11-22
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-09
  Changes: Data collection, Database references, Derived calculations, Refinement description