Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 48877.61 
• Atom Count: 3423 
• Residue Count: 456 
• Unique protein chains: 1

1DSU

HUMAN FACTOR D, COMPLEMENT ACTIVATING ENZYME

• DOI: 10.2210/pdb1DSU/pdb

• Classification: HYDROLASE (SERINE PROTEASE)
• Organism(s): Homo sapiens


• Deposited: 1995-09-15 Released: 1996-08-17 
• Deposition Author(s): Narayana, S.V.L., Volanakis, J.E., Delucas, L.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.203 
• R-Value Work: 0.188 

Literature

Structure of human factor D. A complement system protein at 2.0 A resolution.

Narayana, S.V., Carson, M., el-Kabbani, O., Kilpatrick, J.M., Moore, D., Chen, X., Bugg, C.E., Volanakis, J.E., DeLucas, L.J.

(1994) J.Mol.Biol. 235: 695-708

• PubMed: 8289289 


• PubMed Abstract: 
  

Factor D, an essential enzyme for the activation of the alternative pathway of the complement system, belongs to the serine protease superfamily. The crystal structure of the enzyme was solved by a combination of multiple isomorphous replacement and molecular replacement methods. The present model was refined to an R-factor of 18.8% using 23,681 observed reflections between 7.5 and 2.0 A resolution, with a root-mean-square deviation from standard bond lengths of 0.016 A. The two non-crystallographically related molecules in the triclinic unit cell have distinctive active site conformations. The protein has the general structural fold of a serine protease, but there are several unique amino acid substitutions resulting in significant alterations in the critical loops responsible for catalysis and substrate specificity in serine proteases. Factor D is the first complement serine protease whose three-dimensional structure has been determined.

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Related Citations: 

• Crystallization and Preliminary X-Ray Investigation of Factor D of Human Complement
  Narayana, S.V.,Kilpatrick, J.M.,El-Kabbani, O.,Babu, Y.S.,Bugg, C.E.,Volanakis, J.E.,Delucas, L.J.
  (1991) J.Mol.Biol. 219: 1




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
FACTOR D	A, B	228	Homo sapiens	Mutation(s): 0  Gene Names: CFD (DF, PFD) EC: 3.4.21.46
Find proteins for P00746 (Homo sapiens) Go to Gene View: CFD Go to UniProtKB:  P00746

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.203 
• R-Value Work: 0.188 
• Space Group: P 1

Unit Cell:

Length (Å)	Angle (°)
a = 40.990	α = 101.26
b = 65.020	β = 109.89
c = 40.360	γ = 74.32

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
XENGEN	data reduction
XENGEN	data collection
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-09-15 
• Released Date: 1996-08-17 
• Deposition Author(s): Narayana, S.V.L., Volanakis, J.E., Delucas, L.J.

Revision History 

• Version 1.0: 1996-08-17
  Type: Initial release
• Version 1.1: 2008-03-25
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance