4GA7

Crystal structure of human serpinB1 mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Identification of SERPINB1 as a physiological inhibitor of human granzyme H

Wang, L.Li, Q.Wu, L.Liu, S.Zhang, Y.Yang, X.Zhu, P.Zhang, H.Zhang, K.Lou, J.Liu, P.Tong, L.Sun, F.Fan, Z.

(2013) J.Immunol. 190: 1319-1330

  • DOI: 10.4049/jimmunol.1202542
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The granzyme/perforin pathway is a major mechanism for cytotoxic lymphocytes to eliminate virus-infected and tumor cells. The balance between activation and inhibition of the proteolytic cascade must be tightly controlled to avoid self damage. Granzy ...

    The granzyme/perforin pathway is a major mechanism for cytotoxic lymphocytes to eliminate virus-infected and tumor cells. The balance between activation and inhibition of the proteolytic cascade must be tightly controlled to avoid self damage. Granzyme H (GzmH) is constitutively expressed in NK cells and induces target cell death; however, how GzmH activity is regulated remains elusive. We reported earlier the crystal structures of inactive D102N-GzmH alone and in complex with its synthetic substrate and inhibitor, as well as defined the mechanisms of substrate recognition and enzymatic activation. In this study, we identified SERPINB1 as a potent intracellular inhibitor for GzmH. Upon cleavage of the reactive center loop at Phe(343), SERPINB1 forms an SDS-stable covalent complex with GzmH. SERPINB1 overexpression suppresses GzmH- or LAK cell-mediated cytotoxicity. We determined the crystal structures of active GzmH and SERPINB1 (LM-DD mutant) in the native conformation to 3.0- and 2.9-Å resolution, respectively. Molecular modeling reveals the possible conformational changes in GzmH for the suicide inhibition. Our findings provide new insights into the inhibitory mechanism of SERPINB1 against human GzmH.


    Organizational Affiliation

    Chinese Academy of Sciences Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Leukocyte elastase inhibitor
A, B
389Homo sapiensMutation(s): 2 
Gene Names: SERPINB1 (ELANH2, MNEI, PI2)
Find proteins for P30740 (Homo sapiens)
Go to Gene View: SERPINB1
Go to UniProtKB:  P30740
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 67.339α = 90.00
b = 67.339β = 90.00
c = 180.288γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
ADSCdata collection
REFMACrefinement
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-16
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Database references