3BX1

Complex between the Barley alpha-Amylase/Subtilisin Inhibitor and the subtilisin Savinase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Structural and Mutational Analyses of the Interaction between the Barley alpha-Amylase/Subtilisin Inhibitor and the Subtilisin Savinase Reveal a Novel Mode of Inhibition

Micheelsen, P.O., Vevodova, J., De Maria, L., Ostergaard, P.R., Friis, E.P., Wilson, K., Skjot, M.

(2008) J Mol Biol 380: 681-690

  • DOI: https://doi.org/10.1016/j.jmb.2008.05.034
  • Primary Citation of Related Structures:  
    3BX1

  • PubMed Abstract: 

    • Subtilisins represent a large class of microbial serine proteases. To date, there are three-dimensional structures of proteinaceous inhibitors from three families in complex with subtilisins in the Protein Data Bank. All interact with subtilisin via an exposed loop covering six interacting residues ...

    Subtilisins represent a large class of microbial serine proteases. To date, there are three-dimensional structures of proteinaceous inhibitors from three families in complex with subtilisins in the Protein Data Bank. All interact with subtilisin via an exposed loop covering six interacting residues. Here we present the crystal structure of the complex between the Bacillus lentus subtilisin Savinase and the barley alpha-amylase/subtilisin inhibitor (BASI). This is the first reported structure of a cereal Kunitz-P family inhibitor in complex with a subtilisin. Structural analysis revealed that BASI inhibits Savinase in a novel way, as the interacting loop is shorter than loops previously reported. Mutational analysis showed that Thr88 is crucial for the inhibition, as it stabilises the interacting loop through intramolecular interactions with the BASI backbone.

    Organizational Affiliation: 

    Research and Development, Novozymes A/S, Krogshøjvej 36, 2880 Bagsvaerd, Denmark. pnmi@novozymes.com



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Subtilisin Savinase
A, B
269N/AMutation(s): 0 
EC: 3.4.21.62
UniProt
Find proteins for P29600 (Lederbergia lenta)
Explore P29600 
Go to UniProtKB:  P29600
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29600
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-amylase/subtilisin inhibitorC [auth D],
D [auth C]		181Hordeum vulgareMutation(s): 0 
UniProt
Find proteins for P07596 (Hordeum vulgare)
Explore P07596 
Go to UniProtKB:  P07596
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07596
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
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CA [auth D],
E [auth A],
GA [auth C],
T [auth B]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
CL
Query on CL
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DA [auth D]
EA [auth D]
F [auth A]
FA [auth D]
G [auth A]
DA [auth D],
EA [auth D],
F [auth A],
FA [auth D],
G [auth A],
H [auth A],
HA [auth C],
I [auth A],
IA [auth C],
J [auth A],
JA [auth C],
K [auth A],
KA [auth C],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
NA
Query on NA
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AA [auth B]
BA [auth B]
LA [auth C]
Q [auth A]
R [auth A]
AA [auth B],
BA [auth B],
LA [auth C],
Q [auth A],
R [auth A],
S [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.637α = 90
b = 100.637β = 90
c = 216.242γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-07-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance