6IM1

Crystal structure of a highly thermostable carbonic anhydrase from Persephonella marina EX-H1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 

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Literature

Crystal Structure of a Highly Thermostable alpha-Carbonic Anhydrase from Persephonella marina EX-H1.

Kim, S.Sung, J.Yeon, J.Choi, S.H.Jin, M.S.

(2019) Mol Cells 42: 460-469

  • DOI: 10.14348/molcells.2019.0029
  • Primary Citation of Related Structures:  
    6IM3, 6IM1, 6IM0

  • PubMed Abstract: 
  • Bacterial α-type carbonic anhydrase (α-CA) is a zinc metalloenzyme that catalyzes the reversible and extremely rapid interconversion of carbon dioxide to bicarbonate. In this study, we report the first crystal structure of a hyperthermostable α-CA from Persephonella marina EXH1 ( pm CA) in the absence and presence of competitive inhibitor, acetazolamide ...

    Bacterial α-type carbonic anhydrase (α-CA) is a zinc metalloenzyme that catalyzes the reversible and extremely rapid interconversion of carbon dioxide to bicarbonate. In this study, we report the first crystal structure of a hyperthermostable α-CA from Persephonella marina EXH1 ( pm CA) in the absence and presence of competitive inhibitor, acetazolamide. The structure reveals a compactly folded pm CA homodimer in which each monomer consists of a 10-stranded β-sheet in the center. The catalytic zinc ion is coordinated by three highly conserved histidine residues with an exchangeable fourth ligand (a water molecule, a bicarbonate anion, or the sulfonamide group of acetazolamide). Together with an intramolecular disulfide bond, extensive interfacial networks of hydrogen bonds, ionic and hydrophobic interactions stabilize the dimeric structure and are likely responsible for the high thermal stability. We also identified novel binding sites for calcium ions at the crystallographic interface, which serve as molecular glue linking negatively charged and otherwise repulsive surfaces. Furthermore, this large negatively charged patch appears to further increase the thermostability at alkaline pH range via favorable charge-charge interactions between pm CA and solvent molecules. These findings may assist development of novel α-CAs with improved thermal and/or alkaline stability for applications such as CO 2 capture and sequestration.


    Organizational Affiliation

    School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carbonic anhydrase (Carbonate dehydratase)A, B, C, D, E, F243Persephonella marina EX-H1Mutation(s): 0 
Gene Names: PERMA_1443
EC: 4.2.1.1
UniProt
Find proteins for C0QRB5 (Persephonella marina (strain DSM 14350 / EX-H1))
Explore C0QRB5 
Go to UniProtKB:  C0QRB5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PG4 (Subject of Investigation/LOI)
Query on PG4

Download Ideal Coordinates CCD File 
CA [auth E], EA [auth F], K [auth A], T [auth B]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
ZN (Subject of Investigation/LOI)
Query on ZN

Download Ideal Coordinates CCD File 
BA [auth E], DA [auth F], G [auth A], O [auth B], W [auth C], X [auth D]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA (Subject of Investigation/LOI)
Query on CA

Download Ideal Coordinates CCD File 
AA [auth D] , H [auth A] , I [auth A] , J [auth A] , L [auth A] , M [auth A] , N [auth A] , P [auth B] , 
AA [auth D],  H [auth A],  I [auth A],  J [auth A],  L [auth A],  M [auth A],  N [auth A],  P [auth B],  Q [auth B],  R [auth B],  S [auth B],  U [auth B],  V [auth B],  Y [auth D],  Z [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.924α = 90
b = 120.068β = 90
c = 124.067γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Research Foundation (Korea)Korea, Republic OfNRF-2017R1A2B4003278

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-17
    Type: Initial release
  • Version 2.0: 2019-07-31
    Changes: Atomic model, Data collection, Derived calculations