6EOT

DPP8 - SLRFLYEG, space group 19

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Structures and mechanism of dipeptidyl peptidases 8 and 9, important players in cellular homeostasis and cancer.

Ross, B., Krapp, S., Augustin, M., Kierfersauer, R., Arciniega, M., Geiss-Friedlander, R., Huber, R.

(2018) Proc. Natl. Acad. Sci. U.S.A. 115: E1437-E1445

  • DOI: 10.1073/pnas.1717565115
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Dipeptidyl peptidases 8 and 9 are intracellular N-terminal dipeptidyl peptidases (preferentially postproline) associated with pathophysiological roles in immune response and cancer biology. While the DPP family member DPP4 is extensively characterize ...

    Dipeptidyl peptidases 8 and 9 are intracellular N-terminal dipeptidyl peptidases (preferentially postproline) associated with pathophysiological roles in immune response and cancer biology. While the DPP family member DPP4 is extensively characterized in molecular terms as a validated therapeutic target of type II diabetes, experimental 3D structures and ligand-/substrate-binding modes of DPP8 and DPP9 have not been reported. In this study we describe crystal and molecular structures of human DPP8 (2.5 Å) and DPP9 (3.0 Å) unliganded and complexed with a noncanonical substrate and a small molecule inhibitor, respectively. Similar to DPP4, DPP8 and DPP9 molecules consist of one β-propeller and α/β hydrolase domain, forming a functional homodimer. However, they differ extensively in the ligand binding site structure. In intriguing contrast to DPP4, where liganded and unliganded forms are closely similar, ligand binding to DPP8/9 induces an extensive rearrangement at the active site through a disorder-order transition of a 26-residue loop segment, which partially folds into an α-helix (R-helix), including R160/133, a key residue for substrate binding. As vestiges of this helix are also seen in one of the copies of the unliganded form, conformational selection may contributes to ligand binding. Molecular dynamics simulations support increased flexibility of the R-helix in the unliganded state. Consistently, enzyme kinetics assays reveal a cooperative allosteric mechanism. DPP8 and DPP9 are closely similar and display few opportunities for targeted ligand design. However, extensive differences from DPP4 provide multiple cues for specific inhibitor design and development of the DPP family members as therapeutic targets or antitargets.

    Organizational Affiliation: 

    Max Planck Institut für Biochemie, D-82152 Martinsried, Germany; ross@biochem.mpg.de huber@biochem.mpg.de.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dipeptidyl peptidase 8
A, B, D, G, I, K
898Homo sapiensMutation(s): 0 
Gene Names: DPP8 (DPRP1)
EC: 3.4.14.5
Find proteins for Q6V1X1 (Homo sapiens)
Go to Gene View: DPP8
Go to UniProtKB:  Q6V1X1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SER-LEU-ARG-PHE-LEU-TYR-GLU-GLY
F, C, E, H, J, L
8Homo sapiensMutation(s): 0 
Gene Names: SUMO1 (SMT3C, SMT3H3, UBL1)
Find proteins for P63165 (Homo sapiens)
Go to Gene View: SUMO1
Go to UniProtKB:  P63165
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 148.159α = 90.00
b = 264.675β = 90.00
c = 268.937γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2017-10-10 
  • Released Date: 2018-02-07 
  • Deposition Author(s): Ross, B.R., Huber, R.

Revision History 

  • Version 1.0: 2018-02-07
    Type: Initial release
  • Version 1.1: 2018-02-14
    Type: Database references
  • Version 1.2: 2018-02-28
    Type: Database references