2CMH

Crystal Structure of Spermidine Synthase from Helicobacter Pylori


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal Structure of Helicobacter Pylori Spermidine Synthase: A Rossmann-Like Fold with a Distinct Active Site

Lu, P.-K.Tsai, J.-Y.Chien, H.Y.Huang, H.Chu, C.-H.Sun, Y.-J.

(2007) Proteins 67: 743

  • DOI: https://doi.org/10.1002/prot.21315
  • Primary Citation of Related Structures:  
    2CMG, 2CMH

  • PubMed Abstract: 

    Spermidine synthase (putrescine aminopropyltransferase, PAPT) catalyzes the transfer of the aminopropyl group from decarboxylated S-adenosylmethionine to putrescine during spermidine biosynthesis. Helicobacter pylori PAPT (HpPAPT) has a low sequence identity with other PAPTs and lacks the signature sequence found in other PAPTs. The crystal structure of HpPAPT, determined by multiwavelength anomalous dispersion, revealed an N-terminal beta-stranded domain and a C-terminal Rossmann-like domain. Structural comparison with other PAPTs showed that HpPAPT has a unique binding pocket between two domains, numerous non-conserved residues, a less acidic electrostatic surface potential, and a large buried space within the structure. HpPAPT lacks the gatekeeping loop that facilitates substrate binding in other PAPTs. PAPTs are essential for bacterial cell viability; thus, HpPAPT may be a potential antimicrobial drug target for H. pylori owing to its characteristic PAPT sequence and distinct conformation.


  • Organizational Affiliation

    Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SPERMIDINE SYNTHASE
A, B, C
262Helicobacter pylori 26695Mutation(s): 0 
EC: 2.5.1.16
UniProt
Find proteins for O25503 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore O25503 
Go to UniProtKB:  O25503
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO25503
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.526α = 90
b = 126.468β = 90
c = 143.948γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-08
    Type: Initial release
  • Version 1.1: 2013-11-20
    Changes: Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Version format compliance