4N6M

Crystal structure of human cystatin E/M produced in LEXSY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and mechanism of an aspartimide-dependent Peptide ligase in human legumain.

Dall, E.Fegg, J.C.Briza, P.Brandstetter, H.

(2015) Angew.Chem.Int.Ed.Engl. 54: 2917-2921

  • DOI: 10.1002/anie.201409135
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Peptide ligases expand the repertoire of genetically encoded protein architectures by synthesizing new peptide bonds, energetically driven by ATP or NTPs. Here, we report the discovery of a genuine ligase activity in human legumain (AEP) which has im ...

    Peptide ligases expand the repertoire of genetically encoded protein architectures by synthesizing new peptide bonds, energetically driven by ATP or NTPs. Here, we report the discovery of a genuine ligase activity in human legumain (AEP) which has important roles in immunity and tumor progression that were believed to be due to its established cysteine protease activity. Defying dogma, the ligase reaction is independent of the catalytic cysteine but exploits an endogenous energy reservoir that results from the conversion of a conserved aspartate to a metastable aspartimide. Legumain's dual protease-ligase activities are pH- and thus localization controlled, dominating at acidic and neutral pH, respectively. Their relevance includes reversible on-off switching of cystatin inhibitors and enzyme (in)activation, and may affect the generation of three-dimensional MHC epitopes. The aspartate-aspartimide (succinimide) pair represents a new paradigm of coupling endergonic reactions in ATP-scarce environments.


    Organizational Affiliation

    Department of Molecular Biology, University of Salzburg, 5020 Salzburg (Austria).




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cystatin-M
A, B
132Homo sapiensMutation(s): 0 
Gene Names: CST6
Find proteins for Q15828 (Homo sapiens)
Go to Gene View: CST6
Go to UniProtKB:  Q15828
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.261 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.710α = 90.00
b = 82.630β = 112.81
c = 43.490γ = 90.00
Software Package:
Software NamePurpose
MxCuBEdata collection
iMOSFLMdata reduction
PHASERphasing
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-18
    Type: Initial release
  • Version 1.1: 2015-03-11
    Type: Database references