Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.342 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

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This is version 1.2 of the entry. See complete history


Structure of alpha-lytic protease complexed with its pro region.

Sauter, N.K.Mau, T.Rader, S.D.Agard, D.A.

(1998) Nat Struct Biol 5: 945-950

  • DOI: https://doi.org/10.1038/2919
  • Primary Citation of Related Structures:  
    2PRO, 3PRO, 4PRO

  • PubMed Abstract: 

    While the majority of proteins fold rapidly and spontaneously to their native states, the extracellular bacterial protease alpha-lytic protease (alphaLP) has a t(1/2) for folding of approximately 2,000 years, corresponding to a folding barrier of 30 kcal mol(-1). AlphaLP is synthesized as a pro-enzyme where its pro region (Pro) acts as a foldase to stabilize the transition state for the folding reaction. Pro also functions as a potent folding catalyst when supplied as a separate polypeptide chain, accelerating the rate of alphaLP folding by a factor of 3 x 10(9). In the absence of Pro, alphaLP folds only partially to a stable molten globule-like intermediate state. Addition of Pro to this intermediate leads to rapid formation of native alphaLP. Here we report the crystal structures of Pro and of the non-covalent inhibitory complex between Pro and native alphaLP. The C-shaped Pro surrounds the C-terminal beta-barrel domain of the folded protease, forming a large complementary interface. Regions of extensive hydration in the interface explain how Pro binds tightly to the native state, yet even more tightly to the folding transition state. Based on structural and functional data we propose that a specific structural element in alphaLP is largely responsible for the folding barrier and suggest how Pro can overcome this barrier.

  • Organizational Affiliation

    Howard Hughes Medical Institute, University of California, San Francisco, 94143-0448, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
166Lysobacter enzymogenesMutation(s): 0 
Gene Names: alpha-LP
Find proteins for P00778 (Lysobacter enzymogenes)
Explore P00778 
Go to UniProtKB:  P00778
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00778
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.342 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.6α = 104
b = 54.7β = 102.5
c = 64γ = 91.9
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-27
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance