6I44

Allosteric activation of human prekallikrein by apple domain disc rotation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.36 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

wwPDB Validation   3D Report Full Report



Literature

Plasma kallikrein structure reveals apple domain disc rotated conformation compared to factor XI.

Li, C.Voos, K.M.Pathak, M.Hall, G.McCrae, K.R.Dreveny, I.Li, R.Emsley, J.

(2019) J Thromb Haemost 17: 759-770

  • DOI: 10.1111/jth.14418
  • Primary Citation of Related Structures:  
    6I58, 6I44

  • PubMed Abstract: 
  • Essentials Zymogen PK is activated to PKa and cleaves substrates kininogen and FXII contributing to bradykinin generation. Monomeric PKa and dimeric homologue FXI utilize the N-terminal apple domains to recruit substrates. A high-resolution 1.3 Å structu ...

    Essentials Zymogen PK is activated to PKa and cleaves substrates kininogen and FXII contributing to bradykinin generation. Monomeric PKa and dimeric homologue FXI utilize the N-terminal apple domains to recruit substrates. A high-resolution 1.3 Å structure of full-length PKa reveals an active conformation of the protease and apple domains. The PKa protease and four-apple domain disc organization is 180° rotated compared to FXI. SUMMARY: Background Plasma prekallikrein (PK) and factor XI (FXI) are apple domain-containing serine proteases that when activated to PKa and FXIa cleave substrates kininogen, factor XII, and factor IX, respectively, directing plasma coagulation, bradykinin release, inflammation, and thrombosis pathways. Objective To investigate the three-dimensional structure of full-length PKa and perform a comparison with FXI. Methods A series of recombinant full-length PKa and FXI constructs and variants were developed and the crystal structures determined. Results and conclusions A 1.3 Å structure of full-length PKa reveals the protease domain positioned above a disc-shaped assemblage of four apple domains in an active conformation. A comparison with the homologous FXI structure reveals the intramolecular disulfide and structural differences in the apple 4 domain that prevents dimer formation in PK as opposed to FXI. Two latchlike loops (LL1 and LL2) extend from the PKa protease domain to form interactions with the apple 1 and apple 3 domains, respectively. A major unexpected difference in the PKa structure compared to FXI is the 180° disc rotation of the apple domains relative to the protease domain. This results in a switched configuration of the latch loops such that LL2 interacts and buries portions of the apple 3 domain in the FXI zymogen whereas in PKa LL2 interacts with the apple 1 domain. Hydrogen-deuterium exchange mass spectrometry on plasma purified human PK and PKa determined that regions of the apple 3 domain have increased surface exposure in PKa compared to the zymogen PK, suggesting conformational change upon activation.


    Related Citations: 
    • Crystal structure of the factor XI zymogen reveals a pathway for transactivation.
      Papagrigoriou, E., McEwan, P.A., Walsh, P.N., Emsley, J.
      (2006) Nat Struct Mol Biol 13: 557

    Organizational Affiliation

    Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Plasma kallikrein A627Homo sapiensMutation(s): 0 
Gene Names: KLKB1KLK3
EC: 3.4.21.34
Find proteins for P03952 (Homo sapiens)
Explore P03952 
Go to UniProtKB:  P03952
NIH Common Fund Data Resources
PHAROS:  P03952
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 12 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PE4
Query on PE4

Download Ideal Coordinates CCD File 
A
2-{2-[2-(2-{2-[2-(2-ETHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL
C16 H34 O8
PJWQOENWHPEPKI-UHFFFAOYSA-N
 Ligand Interaction
BAM
Query on BAM

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A
BENZAMIDINE
C7 H9 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-O
 Ligand Interaction
MPD
Query on MPD

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A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
PEG
Query on PEG

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A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
SER
Query on SER

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A
SERINE
C3 H7 N O3
MTCFGRXMJLQNBG-REOHCLBHSA-N
 Ligand Interaction
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
GLY
Query on GLY

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A
GLYCINE
C2 H5 N O2
DHMQDGOQFOQNFH-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
FMT
Query on FMT

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A
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.36 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.611α = 90
b = 129.633β = 90
c = 55.84γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
autoPROCdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
British Heart FoundationUnited KingdomRG/12/9/29775

Revision History 

  • Version 1.0: 2019-03-06
    Type: Initial release
  • Version 1.1: 2019-05-08
    Changes: Data collection, Database references
  • Version 1.2: 2020-07-08
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Refinement description, Structure summary