Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.01 kDa 
• Atom Count: 1468 
• Residue Count: 214 
• Unique protein chains: 1

2M0M

Structural Characterization of Minor Ampullate Spidroin Domains and their Distinct Roles in Fibroin Solubility and Fiber Formation

• DOI: 10.2210/pdb2M0M/pdb
• BMRB: 18811

• Classification: PROTEIN FIBRIL
• Organism(s): Trichonephila antipodiana
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-10-30 Released: 2013-03-27 
• Deposition Author(s): Yang, D., Gao, Z., Lin, Z., Huang, W., Lai, C., Fan, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Structural characterization of minor ampullate spidroin domains and their distinct roles in fibroin solubility and fiber formation

Gao, Z., Lin, Z., Huang, W., Lai, C.C., Fan, J.S., Yang, D.

(2013) PLoS One 8: e56142-e56142

• PubMed: 23418525 
• DOI: 10.1371/journal.pone.0056142
• Primary Citation of Related Structures:  
  2M0M


• PubMed Abstract: 
  

Spider silk is protein fibers with extraordinary mechanical properties. Up to now, it is still poorly understood how silk proteins are kept in a soluble form before spinning into fibers and how the protein molecules are aligned orderly to form fibers. Minor ampullate spidroin is one of the seven types of silk proteins, which consists of four types of domains: N-terminal domain, C-terminal domain (CTD), repetitive domain (RP) and linker domain (LK). Here we report the tertiary structure of CTD and secondary structures of RP and LK in aqueous solution, and their roles in protein stability, solubility and fiber formation. The stability and solubility of individual domains are dramatically different and can be explained by their distinct structures. For the tri-domain miniature fibroin, RP-LK-CTD(Mi), the three domains have no or weak interactions with one another at low protein concentrations (<1 mg/ml). The CTD in RP-LK-CTD(Mi) is very stable and soluble, but it cannot stabilize the entire protein against chemical and thermal denaturation while it can keep the entire tri-domain in a highly water-soluble state. In the presence of shear force, protein aggregation is greatly accelerated and the aggregation rate is determined by the stability of folded domains and solubility of the disordered domains. Only the tri-domain RP-LK-CTD(Mi) could form silk-like fibers, indicating that all three domains play distinct roles in fiber formation: LK as a nucleation site for assembly of protein molecules, RP for assistance of the assembly and CTD for regulating alignment of the assembled molecules.

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Organizational Affiliation: 

Department of Biological Sciences, National University of Singapore, Singapore.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Minor ampullate fibroin 1	A, B	107	Trichonephila antipodiana	Mutation(s): 0
Find proteins for Q2LC34 (Nephila antipodiana) Explore Q2LC34  Go to UniProtKB:  Q2LC34

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2M0M Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-10-30 
• Released Date: 2013-03-27 
Deposition Author(s): Yang, D., Gao, Z., Lin, Z., Huang, W., Lai, C., Fan, J.

Revision History 

• Version 1.0: 2013-03-27
  Type: Initial release