Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 10.15 kDa 
• Atom Count: 777 
• Modelled Residue Count: 87 
• Deposited Residue Count: 87 
• Unique protein chains: 1

2W9Q

Crystal Structure of Potato Multicystatin-P212121

• DOI: 10.2210/pdb2W9Q/pdb

• Classification: HYDROLASE INHIBITOR
• Organism(s): Solanum tuberosum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-01-28 Released: 2010-02-02 
• Deposition Author(s): Nissen, M.S., Kumar, G.N., Youn, B., Knowles, D.B., Lam, K.S., Ballinger, W.J., Knowles, N.R., Kang, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.232 
• R-Value Work: 0.193 
• R-Value Observed: 0.193 

Literature

Characterization of Solanum Tuberosum Multicystatin and its Structural Comparison with Other Cystatins.

Nissen, M.S., Kumar, G.N., Youn, B., Knowles, D.B., Lam, K.S., Ballinger, W.J., Knowles, N.R., Kang, C.

(2009) Plant Cell 21: 861

• PubMed: 19304935 
• DOI: 10.1105/tpc.108.064717
• Primary Citation of Related Structures:  
  2W9P, 2W9Q


• PubMed Abstract: 
  

Potato (Solanum tuberosum) multicystatin (PMC) is a crystalline Cys protease inhibitor present in the subphellogen layer of potato tubers. It consists of eight tandem domains of similar size and sequence. Our in vitro results showed that the pH/PO(4)(-)-dependent oligomeric behavior of PMC was due to its multidomain nature and was not a characteristic of the individual domains. Using a single domain of PMC, which still maintains inhibitor activity, we identified a target protein of PMC, a putative Cys protease. In addition, our crystal structure of a representative repeating unit of PMC, PMC-2, showed structural similarity to both type I and type II cystatins. The N-terminal trunk, alpha-helix, and L2 region of PMC-2 were most similar to those of type I cystatins, while the conformation of L1 more closely resembled that of type II cystatins. The structure of PMC-2 was most similar to the intensely sweet protein monellin from Dioscorephyllum cumminisii (serendipity berry), despite a low level of sequence similarity. We present a model for the possible molecular organization of the eight inhibitory domains in crystalline PMC. The unique molecular properties of the oligomeric PMC crystal are discussed in relation to its potential function in regulating the activity of proteases in potato tubers.

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Organizational Affiliation: 

School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MULTICYSTATIN	A	87	Solanum tuberosum	Mutation(s): 0
Find proteins for P37842 (Solanum tuberosum) Explore P37842  Go to UniProtKB:  P37842

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.232 
• R-Value Work: 0.193 
• R-Value Observed: 0.193 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 25.46	α = 90
b = 54.53	β = 90
c = 79.15	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	refinement
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-01-28 
• Released Date: 2010-02-02 
Deposition Author(s): Nissen, M.S., Kumar, G.N., Youn, B., Knowles, D.B., Lam, K.S., Ballinger, W.J., Knowles, N.R., Kang, C.

Revision History  

• Version 1.0: 2010-02-02
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2019-09-04
  Changes: Data collection