2XRC

Human complement factor I

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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Literature

Structural Basis for Complement Factor I Control and its Disease-Associated Sequence Polymorphisms.

Roversi, P., Johnson, S., Caesar, J.J., Mclean, F., Leath, K.J., Tsiftsoglou, S.A., Morgan, B.P., Harris, C.L., Sim, R.B., Lea, S.M.

(2011) Proc Natl Acad Sci U S A 108: 12839

  • DOI: 10.1073/pnas.1102167108
  • Primary Citation of Related Structures:  
    2XRC

  • PubMed Abstract: 

    • The complement system is a key component of innate and adaptive immune responses. Complement regulation is critical for prevention and control of disease. We have determined the crystal structure of the complement regulatory enzyme human factor I (fI). FI is in a proteolytically inactive form, demonstrating that it circulates in a zymogen-like state despite being fully processed to the mature sequence ...

    The complement system is a key component of innate and adaptive immune responses. Complement regulation is critical for prevention and control of disease. We have determined the crystal structure of the complement regulatory enzyme human factor I (fI). FI is in a proteolytically inactive form, demonstrating that it circulates in a zymogen-like state despite being fully processed to the mature sequence. Mapping of functional data from mutants of fI onto the structure suggests that this inactive form is maintained by the noncatalytic heavy-chain allosterically modulating activity of the light chain. Once the ternary complex of fI, a cofactor and a substrate is formed, the allosteric inhibition is released, and fI is oriented for cleavage. In addition to explaining how circulating fI is limited to cleaving only C3b/C4b, our model explains the molecular basis of disease-associated polymorphisms in fI and its cofactors.

    Organizational Affiliation: 

    Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HUMAN COMPLEMENT FACTOR IA, B, C, D565Homo sapiensMutation(s): 0 
Gene Names: CFI, IF
EC: 3.4.21.45
UniProt & NIH Common Fund Data Resources
Find proteins for P05156 (Homo sapiens)
Explore P05156 
Go to UniProtKB:  P05156
PHAROS:  P05156
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05156
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
AA [auth C],
DA [auth D],
EA [auth D],
FA [auth D],
G [auth A],
AA [auth C],
DA [auth D],
EA [auth D],
FA [auth D],
G [auth A],
GA [auth D],
H [auth A],
HA [auth D],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
W [auth C],
X [auth C],
Y [auth C],
Z [auth C]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
BA [auth D],
CA [auth D],
E [auth A],
F [auth A],
M [auth B],
BA [auth D],
CA [auth D],
E [auth A],
F [auth A],
M [auth B],
N [auth B],
U [auth C],
V [auth C]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.317α = 89.98
b = 234.721β = 90.18
c = 40.3γ = 90.03
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-07-13
    Type: Initial release
  • Version 1.1: 2011-08-17
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Other, Structure summary