1DLE

FACTOR B SERINE PROTEASE DOMAIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

New structural motifs on the chymotrypsin fold and their potential roles in complement factor B.

Jing, H.Xu, Y.Carson, M.Moore, D.Macon, K.J.Volanakis, J.E.Narayana, S.V.

(2000) EMBO J. 19: 164-173

  • DOI: 10.1093/emboj/19.2.164

  • PubMed Abstract: 
  • Factor B and C2 are two central enzymes for complement activation. They are multidomain serine proteases and require cofactor binding for full expression of proteolytic activities. We present a 2.1 A crystal structure of the serine protease domain of ...

    Factor B and C2 are two central enzymes for complement activation. They are multidomain serine proteases and require cofactor binding for full expression of proteolytic activities. We present a 2.1 A crystal structure of the serine protease domain of factor B. It shows a number of structural motifs novel to the chymotrypsin fold, which by sequence homology are probably present in C2 as well. These motifs distribute characteristically on the protein surface. Six loops surround the active site, four of which shape substrate-binding pockets. Three loops next to the oxyanion hole, which typically mediate zymogen activation, are much shorter or absent. Three insertions including the linker to the preceding domain bulge from the side opposite to the active site. The catalytic triad and non-specific substrate-binding site display active conformations, but the oxyanion hole displays a zymogen-like conformation. The bottom of the S1 pocket has a negative charge at residue 226 instead of the typical 189 position. These unique structural features may play different roles in domain-domain interaction, cofactor binding and substrate binding.


    Organizational Affiliation

    Center for Macromolecular Crystallography, School of Optometry, University of Alabama at Birmingham, 35294, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
COMPLEMENT FACTOR B
A, B
298Homo sapiensMutation(s): 0 
Gene Names: CFB (BF, BFD)
EC: 3.4.21.47
Find proteins for P00751 (Homo sapiens)
Go to Gene View: CFB
Go to UniProtKB:  P00751
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 51.643α = 90.00
b = 74.259β = 95.55
c = 73.258γ = 90.00
Software Package:
Software NamePurpose
DMMultimodel building
DENZOdata reduction
XTALVIEWrefinement
AMoREphasing
CNSrefinement
SCALEPACKdata scaling
MLPHAREphasing
DMMultiphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-12-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description