6CKH

Manduca sexta Peptidoglycan Recognition Protein-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

The three-dimensional structure and recognition mechanism of Manduca sexta peptidoglycan recognition protein-1.

Hu, Y.Cao, X.Li, X.Wang, Y.Boons, G.J.Deng, J.Jiang, H.

(2019) Insect Biochem Mol Biol 108: 44-52

  • DOI: 10.1016/j.ibmb.2019.03.001
  • Primary Citation of Related Structures:  
    6CKH

  • PubMed Abstract: 
  • Peptidoglycan recognition proteins (PGRPs) recognize bacteria through their unique cell wall constituent, peptidoglycans (PGs). PGRPs are conserved from insects to mammals and all function in antibacterial defense. In the tobacco hornworm Manduca sexta, PGRP1 and microbe binding protein (MBP) interact with PGs and hemolymph protease-14 precursor (proHP14) to yield active HP14 ...

    Peptidoglycan recognition proteins (PGRPs) recognize bacteria through their unique cell wall constituent, peptidoglycans (PGs). PGRPs are conserved from insects to mammals and all function in antibacterial defense. In the tobacco hornworm Manduca sexta, PGRP1 and microbe binding protein (MBP) interact with PGs and hemolymph protease-14 precursor (proHP14) to yield active HP14. HP14 triggers a serine protease network that produces active phenoloxidase (PO), Spätzle, and other cytokines to stimulate immune responses. PGRP1 binds preferentially to diaminopimelic acid (DAP)-PGs of Gram-negative bacteria and Gram-positive Bacillus and Clostridium species than Lys-PGs of other Gram-positive bacteria. In this study, we synthesized DAP- and Lys-muramyl pentapeptide (MPP) and monitored their associations with M. sexta PGRP1 by surface plasmon resonance. The K d values (0.57 μM for DAP-MPP and 45.6 μM for Lys-MPP) agree with the differential recognition of DAP- and Lys-PGs. To reveal its structural basis, we produced the PGRP1 in insect cells and determined its structure at a resolution of 2.1 Å. The protein adopts a fold similar to those from other PGRPs with a classical L-shaped PG-binding groove. A unique loop lining the shallow groove suggests a different ligand-binding mechanism. In summary, this study provided new insights into the PG recognition by PGRPs, a critical first step that initiates the serine protease cascade.


    Organizational Affiliation

    Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, 74078, USA. Electronic address: haobo.jiang@okstate.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Peptidoglycan-recognition proteinA180Manduca sextaMutation(s): 0 
UniProt
Find proteins for Q86RS6 (Manduca sexta)
Explore Q86RS6 
Go to UniProtKB:  Q86RS6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.734α = 90
b = 46.469β = 103.05
c = 62.363γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2018-02-28 
  • Released Date: 2019-06-05 
  • Deposition Author(s): Hu, Y.

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-05
    Type: Initial release