2XVY

Cobalt chelatase CbiK (periplasmic) from Desulvobrio vulgaris Hildenborough (co-crystallised with cobalt and SHC)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Desulfovibrio vulgaris CbiK(P) cobaltochelatase: evolution of a haem binding protein orchestrated by the incorporation of two histidine residues.

Lobo, S.A.Videira, M.A.Pacheco, I.Wass, M.N.Warren, M.J.Teixeira, M.Matias, P.M.Romao, C.V.Saraiva, L.M.

(2017) Environ. Microbiol. 19: 106-118

  • DOI: 10.1111/1462-2920.13479

  • PubMed Abstract: 
  • The sulfate-reducing bacteria of the Desulfovibrio genus make three distinct modified tetrapyrroles, haem, sirohaem and adenosylcobamide, where sirohydrochlorin acts as the last common biosynthetic intermediate along the branched tetrapyrrole pathway ...

    The sulfate-reducing bacteria of the Desulfovibrio genus make three distinct modified tetrapyrroles, haem, sirohaem and adenosylcobamide, where sirohydrochlorin acts as the last common biosynthetic intermediate along the branched tetrapyrrole pathway. Intriguingly, D. vulgaris encodes two sirohydrochlorin chelatases, CbiK P and CbiK C , that insert cobalt/iron into the tetrapyrrole macrocycle but are thought to be distinctly located in the periplasm and cytoplasm respectively. Fusing GFP onto the C-terminus of CbiK P confirmed that the protein is transported to the periplasm. The structure-function relationship of CbiK P was studied by constructing eleven site-directed mutants and determining their chelatase activities, oligomeric status and haem binding abilities. Residues His154 and His216 were identified as essential for metal-chelation of sirohydrochlorin. The tetrameric form of the protein is stabilized by Arg54 and Glu76, which form hydrogen bonds between two subunits. His96 is responsible for the binding of two haem groups within the main central cavity of the tetramer. Unexpectedly, CbiK P is shown to bind two additional haem groups through interaction with His103. Thus, although still retaining cobaltochelatase activity, the presence of His96 and His103 in CbiK P , which are absent from all other known bacterial cobaltochelatases, has evolved CbiK P a new function as a haem binding protein permitting it to act as a potential haem chaperone or transporter.


    Organizational Affiliation

    Instituto de Tecnologia Química e Biológica NOVA, Avenida da República (EAN), Oeiras, 2780-157, Portugal.,iBET, Instituto de Biologia Experimental e Tecnológica, Apartado 12, Oeiras, 2781-901, Portugal.,School of Biosciences, University of Kent, Giles Lane, Canterbury, Kent, CT2 7NJ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHELATASE, PUTATIVE
A
269Desulfovibrio vulgaris (strain Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303)Mutation(s): 0 
Gene Names: cbiKp
EC: 4.99.1.3
Find proteins for Q72EC8 (Desulfovibrio vulgaris (strain Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303))
Go to UniProtKB:  Q72EC8
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
PER
Query on PER

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A
PEROXIDE ION
O2
ANAIPYUSIMHBEL-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

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A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CO
Query on CO

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A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.172 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 120.810α = 90.00
b = 120.810β = 90.00
c = 119.710γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-16
    Type: Initial release
  • Version 1.1: 2017-01-25
    Type: Database references
  • Version 1.2: 2017-03-01
    Type: Database references