5INW

Structure of reaction loop cleaved lamprey angiotensinogen

  • Classification: HORMONE
  • Organism(s): Lampetra fluviatilis
  • Expression System: Escherichia coli
  • Mutation(s): Yes 

  • Deposited: 2016-03-08 Released: 2016-10-05 
  • Deposition Author(s): Wei, H., Zhou, A.
  • Funding Organization(s): National Basic Research Program of China, National Natural Science Foundation of China, Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Shanghai PuJiang Program, and Innovation Program of Shanghai Municipal Education Commission

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Heparin Binds Lamprey Angiotensinogen and Promotes Thrombin Inhibition through a Template Mechanism

Wei, H.Cai, H.Wu, J.Wei, Z.Zhang, F.Huang, X.Ma, L.Feng, L.Zhang, R.Wang, Y.Ragg, H.Zheng, Y.Zhou, A.

(2016) J Biol Chem 291: 24900-24911

  • DOI: 10.1074/jbc.M116.725895
  • Primary Citation of Related Structures:  
    5INW

  • PubMed Abstract: 
  • Lamprey angiotensinogen (l-ANT) is a hormone carrier in the regulation of blood pressure, but it is also a heparin-dependent thrombin inhibitor in lamprey blood coagulation system. The detailed mechanisms on how angiotensin is carried by l-ANT and how heparin binds l-ANT and mediates thrombin inhibition are unclear ...

    Lamprey angiotensinogen (l-ANT) is a hormone carrier in the regulation of blood pressure, but it is also a heparin-dependent thrombin inhibitor in lamprey blood coagulation system. The detailed mechanisms on how angiotensin is carried by l-ANT and how heparin binds l-ANT and mediates thrombin inhibition are unclear. Here we have solved the crystal structure of cleaved l-ANT at 2.7 Å resolution and characterized its properties in heparin binding and protease inhibition. The structure reveals that l-ANT has a conserved serpin fold with a labile N-terminal angiotensin peptide and undergoes a typical stressed-to-relaxed conformational change when the reactive center loop is cleaved. Heparin binds l-ANT tightly with a dissociation constant of ∼10 nm involving ∼8 monosaccharides and ∼6 ionic interactions. The heparin binding site is located in an extensive positively charged surface area around helix D involving residues Lys-148, Lys-151, Arg-155, and Arg-380. Although l-ANT by itself is a poor thrombin inhibitor with a second order rate constant of 500 m -1 s -1 , its interaction with thrombin is accelerated 90-fold by high molecular weight heparin following a bell-shaped dose-dependent curve. Short heparin chains of 6-20 monosaccharide units are insufficient to promote thrombin inhibition. Furthermore, an l-ANT mutant with the P1 Ile mutated to Arg inhibits thrombin nearly 1500-fold faster than the wild type, which is further accelerated by high molecular weight heparin. Taken together, these results suggest that heparin binds l-ANT at a conserved heparin binding site around helix D and promotes the interaction between l-ANT and thrombin through a template mechanism conserved in vertebrates.


    Organizational Affiliation

    From the Hongqiao International Institute of Medicine, Shanghai Tongren Hospital/Faculty of Basic Medicine, Chemical Biology Division of Shanghai Universities E-Institutes, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China and aiwuzhou@gmail.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative angiotensinogenA, B421Lampetra fluviatilisMutation(s): 1 
Gene Names: agt
UniProt
Find proteins for C0MNC6 (Lampetra fluviatilis)
Explore C0MNC6 
Go to UniProtKB:  C0MNC6
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
C-terminal peptide of Putative angiotensinogenC, D35Lampetra fluviatilisMutation(s): 0 
Gene Names: agt
UniProt
Find proteins for C0MNC6 (Lampetra fluviatilis)
Explore C0MNC6 
Go to UniProtKB:  C0MNC6
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
E [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.4α = 90
b = 119.36β = 90
c = 141.59γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-03-08 
  • Released Date: 2016-10-05 
  • Deposition Author(s): Wei, H., Zhou, A.

Funding OrganizationLocationGrant Number
National Basic Research Program of ChinaChina2014CB910304
National Natural Science Foundation of ChinaChina31370727
National Natural Science Foundation of ChinaChina31170724
Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Shanghai PuJiang Program, and Innovation Program of Shanghai Municipal Education CommissionChina12ZZ113

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-05
    Type: Initial release
  • Version 1.1: 2016-10-19
    Changes: Database references
  • Version 1.2: 2016-12-07
    Changes: Database references