Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.77 kDa 
• Atom Count: 634 
• Modelled Residue Count: 88 
• Deposited Residue Count: 120 
• Unique protein chains: 1

2MK0

Structure of the PSCD4-domain of the cell wall protein pleuralin-1 from the diatom Cylindrotheca fusiformis

• PDB DOI: 10.2210/pdb2MK0/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Cylindrotheca fusiformis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2014-01-22 Released: 2015-02-25 
• Deposition Author(s): De Sanctis, S., Wenzler, M., Kroeger, N., Malloni, W.M., Sumper, M., Deutzmann, R., Zadravec, P., Brunner, E., Kremer, W., Kalbitzer, S.H.R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 2000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

PSCD Domains of Pleuralin-1 from the Diatom Cylindrotheca fusiformis: NMR Structures and Interactions with Other Biosilica-Associated Proteins.

De Sanctis, S., Wenzler, M., Kroger, N., Malloni, W.M., Sumper, M., Deutzmann, R., Zadravec, P., Brunner, E., Kremer, W., Kalbitzer, H.R.

(2016) Structure 24: 1178-1191

• PubMed: 27320836 
• DOI: 10.1016/j.str.2016.04.021
• Primary Citation of Related Structures:  
  2MK0, 2NBI


• PubMed Abstract: 
  

Diatoms are eukaryotic unicellular algae characterized by silica cell walls and associated with three unique protein families, the pleuralins, frustulins, and silaffins. The NMR structure of the PSCD4 domain of pleuralin-1 from Cylindrotheca fusiformis contains only three short helical elements and is stabilized by five unique disulfide bridges. PSCD4 contains two binding sites for Ca(2+) ions with millimolar affinity. NMR-based interaction studies show an interaction of the domain with native silaffin-1A as well as with α-frustulins. The interaction sites of the two proteins mapped on the PSCD4 structure are contiguous and show only a small overlap. A plausible functional role of pleuralin could be to bind simultaneously silaffin-1A located inside the cell wall and α-frustulin coating the cell wall, thus connecting the interfaces between hypotheca and epitheca at the girdle bands. Restrained molecular dynamics calculations suggest a bead-chain-like structure of the central part of pleuralin-1.

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Related Citations: 

• 1H, 13C and 15N sequence-specific resonance assignment of the PSCD4 domain of diatom cell wall protein pleuralin-1 [etter].
  Wenzler, M., Brunner, E., Kroger, N., Lehmann, G., Sumper, M., Kalbitze, H.R.
  (2001) J Biomol NMR 20: 191

• Characterization of a 200-kDa diatom protein that is specifically associated with a silica-based substructure of the cell wall.
  Kroger, N., Lehmann, G., Rachel, R., Sumper, M.
  (1997) Eur J Biochem 250: 99

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Organizational Affiliation: 

Institute of Biophysics und Physical Biochemistry, Centre of Magnetic Resonance in Chemistry and Biomedicine, University of Regensburg, 93040 Regensburg, Germany. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEP200 protein	A	120	Cylindrotheca fusiformis	Mutation(s): 0  Gene Names: hepA
UniProt
Find proteins for O22015 (Cylindrotheca fusiformis) Explore O22015  Go to UniProtKB:  O22015

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 2000 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2MK0 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-01-22 
• Released Date: 2015-02-25 
Deposition Author(s): De Sanctis, S., Wenzler, M., Kroeger, N., Malloni, W.M., Sumper, M., Deutzmann, R., Zadravec, P., Brunner, E., Kremer, W., Kalbitzer, S.H.R.

Revision History  

• Version 1.0: 2015-02-25
  Type: Initial release
  
• Version 1.1: 2016-12-14
  Changes: Database references