Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 11.54 kDa 
• Atom Count: 812 
• Modelled Residue Count: 106 
• Deposited Residue Count: 106 
• Unique protein chains: 1

2M19

Solution structure of the Haloferax volcanii HVO 2177 protein

• DOI: 10.2210/pdb2M19/pdb
• BMRB: 18850

• Classification: PROTEIN BINDING
• Organism(s): Haloferax volcanii DS2
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2012-11-21 Released: 2013-08-07 
• Deposition Author(s): Li, Y., Maciejewski, M.W., Martin, J., Jin, K., Zhang, Y., Lu, M., Maupin-Furlow, J.A., Hao, B.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

Crystal structure of the ubiquitin-like small archaeal modifier protein 2 from Haloferax volcanii.

Li, Y., Maciejewski, M.W., Martin, J., Jin, K., Zhang, Y., Maupin-Furlow, J.A., Hao, B.

(2013) Protein Sci 22: 1206-1217

• PubMed: 23821306 
• DOI: 10.1002/pro.2305
• Primary Citation of Related Structures:  
  2M19, 4HRS


• PubMed Abstract: 
  

The discovery of ubiquitin-like small archaeal modifier protein 2 (SAMP2) that forms covalent polymeric chains in Haloferax volcanii has generated tremendous interest in the function and regulation of this protein. At present, it remains unclear whether the Hfx. volcanii modifier protein SAMP1 has such polyubiquitinating-like activity. Although SAMP1 and SAMP2 use the same conjugation machinery to modify their target proteins, each can impart distinct functional consequences. To better understand the mechanism of SAMP2 conjugation, we have sought to characterize the biophysical and structural properties of the protein from Hfx. volcanii. SAMP2 is only partially structured under mesohalic solution conditions and adopts a well-folded compact conformation in the presence of 2.5M of NaCl. Its 2.3-Å-resolution crystal structure reveals a characteristic α/β central core domain and a unique β-hinge motif. This motif anchors an unusual C-terminal extension comprising the diglycine tail as well as two lysine residues that can potentially serve to interlink SAMP2 moieties. Mutational alternation of the structural malleability of this β-hinge motif essentially abolishes the conjugation activity of SAMP2 in vivo. In addition, NMR structural studies of the putative ubiquitin-like protein HVO_2177 from Hfx. volcanii show that like SAMP1, HVO_2177 forms a classic β-grasp fold in a salt-independent manner. These results provide insights into the structure-function relationship of sampylating proteins of fundamental importance in post-translational protein modification and environmental cues in Archaea.

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Organizational Affiliation: 

Department of Molecular, Microbial, and Structural Biology, University of Connecticut Health Center, Farmington, Connecticut, 06030.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Molybdopterin converting factor subunit 1	A	106	Haloferax volcanii DS2	Mutation(s): 0  Gene Names: HVO_2177, samp3
UniProt
Find proteins for D4GVB0 (Haloferax volcanii (strain ATCC 29605 / DSM 3757 / JCM 8879 / NBRC 14742 / NCIMB 2012 / VKM B-1768 / DS2)) Explore D4GVB0  Go to UniProtKB:  D4GVB0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 
• OLDERADO: 2M19 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-11-21 
• Released Date: 2013-08-07 
Deposition Author(s): Li, Y., Maciejewski, M.W., Martin, J., Jin, K., Zhang, Y., Lu, M., Maupin-Furlow, J.A., Hao, B.

Revision History  

• Version 1.0: 2013-08-07
  Type: Initial release
  
• Version 1.1: 2013-08-21
  Changes: Database references
• Version 1.2: 2013-10-02
  Changes: Database references