2JYS

Solution structure of Simian Foamy Virus (mac) protease


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.1 of the entry. See complete history


Literature

The solution structure of the simian foamy virus protease reveals a monomeric protein

Hartl, M.J.Woehrl, B.M.Roesch, P.Schweimer, K.

(2008) J Mol Biol 381: 141-149

  • DOI: 10.1016/j.jmb.2008.05.064
  • Primary Citation of Related Structures:  
    2JYS

  • PubMed Abstract: 
  • In contrast to orthoretroviruses, foamy viruses (FVs) express their Pol polyprotein from a separate pol-specific transcript. Only the integrase domain is cleaved off, leading to a protease-reverse transcriptase (PR-RT) protein. We purified the separate PR domain (PRshort) of simian FV from macaques by expressing the recombinant gene in Escherichia coli ...

    In contrast to orthoretroviruses, foamy viruses (FVs) express their Pol polyprotein from a separate pol-specific transcript. Only the integrase domain is cleaved off, leading to a protease-reverse transcriptase (PR-RT) protein. We purified the separate PR domain (PRshort) of simian FV from macaques by expressing the recombinant gene in Escherichia coli. Sedimentation analyses and size exclusion chromatography indicate that PRshort is a stable monomer in solution. This allowed us to determine the structure of the PRshort monomer using 1426 experimental restraints derived from NMR spectroscopy. The superposition of 20 conformers resulted in a backbone atom rmsd of 0.55 A for residues Gln8-Leu93. Although the overall folds are similar, the macaque simian FV PRshort reveals significant differences in the dimerization interface relative to other retroviral PRs, such as HIV-1 (human immunodeficiency virus type 1) PR, which appear to be rather stable dimers. Especially the flap region and the N- and C-termini of PRshort are highly flexible. Neglecting these regions, the backbone atom rmsd drops to 0.32 A, highlighting the good definition of the central part of the protein. To exclude that the monomeric state of PRshort is due to cleaving off the RT, we purified the complete PR-RT and performed size exclusion chromatography. Our data show that PR-RT is also monomeric. We thus conclude adoption of a monomeric state of PR-RT to be a regulatory mechanism to inhibit PR activity before virus assembly in order to reduce packaging problems. Dimerization might therefore be triggered by additional viral or cellular factors.


    Organizational Affiliation

    Lehrstuhl für Struktur und Chemie der Biopolymere, Universität Bayreuth, 95440 Bayreuth, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protease/Reverse transcriptaseA107Macaque simian foamy virusMutation(s): 0 
Gene Names: pol
EC: 3.4.23 (PDB Primary Data), 2.7.7.49 (UniProt), 2.7.7.7 (UniProt), 3.1.26.4 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P23074 (Simian foamy virus type 1)
Explore P23074 
Go to UniProtKB:  P23074
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2JYS Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-06-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance