4GA7

Crystal structure of human serpinB1 mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 

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:  
    4GA7, 4GAW

  • 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. Granzyme H (GzmH) is constitutively expressed in NK cells and induces target cell death; however, how GzmH activity is regulated remains elusive ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Leukocyte elastase inhibitorA, B389Homo sapiensMutation(s): 2 
Gene Names: SERPINB1ELANH2MNEIPI2
UniProt & NIH Common Fund Data Resources
Find proteins for P30740 (Homo sapiens)
Explore P30740 
Go to UniProtKB:  P30740
PHAROS:  P30740
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.339α = 90
b = 67.339β = 90
c = 180.288γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

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