2LLA

NMR solution structure ensemble of domain 11 of the echidna M6P/IGF2R receptor

• PDB DOI: https://doi.org/10.2210/pdb2LLA/pdb
• BMRB: 17287

• Classification: TRANSPORT PROTEIN
• Organism(s): Tachyglossus aculeatus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-11-05 Released: 2012-11-07 
• Deposition Author(s): Strickland, M., Crump, M.P., Williams, C., Rezgui, D., Ellis, R.Z., Hoppe, H., Frago, S., Prince, S.N., Zaccheo, O.J., Forbes, B.E., Jones, E., Hassan, A.Z., Wattana-Amorn, P.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: STRUCTURES WITH THE LOWEST ENER 

Literature

An exon splice enhancer primes IGF2:IGF2R binding site structure and function evolution.

Williams, C., Hoppe, H.J., Rezgui, D., Strickland, M., Forbes, B.E., Grutzner, F., Frago, S., Ellis, R.Z., Wattana-Amorn, P., Prince, S.N., Zaccheo, O.J., Nolan, C.M., Mungall, A.J., Jones, E.Y., Crump, M.P., Hassan, A.B.

(2012) Science 338: 1209-1213

• PubMed: 23197533 
• DOI: https://doi.org/10.1126/science.1228633
• Primary Citation of Related Structures:  
  2L29, 2L2A, 2L2G, 2LLA


• PubMed Abstract: 
  

  Placental development and genomic imprinting coevolved with parental conflict over resource distribution to mammalian offspring. The imprinted genes IGF2 and IGF2R code for the growth promoter insulin-like growth factor 2 (IGF2) and its inhibitor, mannose 6-phosphate (M6P)/IGF2 receptor (IGF2R), respectively. M6P/IGF2R of birds and fish do not recognize IGF2. In monotremes, which lack imprinting, IGF2 specifically bound M6P/IGF2R via a hydrophobic CD loop. We show that the DNA coding the CD loop in monotremes functions as an exon splice enhancer (ESE) and that structural evolution of binding site loops (AB, HI, FG) improved therian IGF2 affinity. We propose that ESE evolution led to the fortuitous acquisition of IGF2 binding by M6P/IGF2R that drew IGF2R into parental conflict; subsequent imprinting may then have accelerated affinity maturation.

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Organizational Affiliation: 

Department of Organic and Biological Chemistry, School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 15.3 kDa 
• Atom Count: 1,070 
• Modelled Residue Count: 140 
• Deposited Residue Count: 140 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Mannose-6-phosphate/insulin-like growth factor II receptor	A	140	Tachyglossus aculeatus	Mutation(s): 0  Gene Names: igf2r, m6p/igf2r
UniProt
Find proteins for Q95LC7 (Tachyglossus aculeatus) Explore Q95LC7  Go to UniProtKB:  Q95LC7

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: STRUCTURES WITH THE LOWEST ENER 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-11-07 
Deposition Author(s): Strickland, M., Crump, M.P., Williams, C., Rezgui, D., Ellis, R.Z., Hoppe, H., Frago, S., Prince, S.N., Zaccheo, O.J., Forbes, B.E., Jones, E., Hassan, A.Z., Wattana-Amorn, P.

Revision History  

• Version 1.0: 2012-11-07
  Type: Initial release
  
• Version 1.1: 2012-12-12
  Changes: Database references
• Version 1.2: 2024-10-16
  Changes: Data collection, Database references, Structure summary