6YMF

Crystal structure of serine hydroxymethyltransferase from Aphanothece halophytica in the PLP-Serine external aldimine state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.130 
  • R-Value Work: 0.106 
  • R-Value Observed: 0.107 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural and kinetic properties of serine hydroxymethyltransferase from the halophytic cyanobacterium Aphanothece halophytica provide a rationale for salt tolerance.

Nogues, I.Tramonti, A.Angelaccio, S.Ruszkowski, M.Sekula, B.Contestabile, R.

(2020) Int J Biol Macromol 159: 517-529

  • DOI: https://doi.org/10.1016/j.ijbiomac.2020.05.081
  • Primary Citation of Related Structures:  
    6YMD, 6YME, 6YMF

  • PubMed Abstract: 

    Serine hydroxymethyltransferase (SHMT) is a pyridoxal 5'-phosphate-dependent enzyme that plays a pivotal role in cellular one‑carbon metabolism. In plants and cyanobacteria, this enzyme is also involved in photorespiration and confers salt tolerance, as in the case of SHMT from the halophilic cyanobacterium Aphanothece halophytica (AhSHMT). We have characterized the catalytic properties of AhSHMT in different salt and pH conditions. Although the kinetic properties of AhSHMT correlate with those of the mesophilic orthologue from Escherichia coli, AhSHMT appears more catalytically efficient, especially in presence of salt. Our studies also reveal substrate inhibition, previously unobserved in AhSHMT. Furthermore, addition of the osmoprotectant glycine betaine under salt conditions has a distinct positive effect on AhSHMT activity. The crystal structures of AhSHMT in three forms, as internal aldimine, as external aldimine with the l-serine substrate, and as a covalent complex with malonate, give structural insights on the possible role of specific amino acid residues implicated in the halophilic features of AhSHMT. Importantly, we observed that overexpression of the gene encoding SHMT, independently from its origin, increases the capability of E. coli to grow in high salt conditions, suggesting that the catalytic activity of this enzyme in itself plays a fundamental role in salt tolerance.


  • Organizational Affiliation

    Istituto di Ricerca sugli Ecosistemi Terrestri, Consiglio Nazionale delle Ricerche, Monterotondo, Italy.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine hydroxymethyltransferase447Aphanothece halophyticaMutation(s): 0 
Gene Names: glyrAglyA
EC: 2.1.2.1
UniProt
Find proteins for I7H6W6 (Aphanothece halophytica)
Explore I7H6W6 
Go to UniProtKB:  I7H6W6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupI7H6W6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PLS (Subject of Investigation/LOI)
Query on PLS

Download Ideal Coordinates CCD File 
E [auth A][3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL]-SERINE
C11 H17 N2 O8 P
ODVKKQWXKRZJLG-VIFPVBQESA-N
1PE
Query on 1PE

Download Ideal Coordinates CCD File 
G [auth A]PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A]
C [auth A]
D [auth A]
F [auth A]
H [auth A]
B [auth A],
C [auth A],
D [auth A],
F [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.130 
  • R-Value Work: 0.106 
  • R-Value Observed: 0.107 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.888α = 90
b = 93.888β = 90
c = 134.683γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesIntramural Research Program

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-03
    Type: Initial release
  • Version 1.1: 2020-06-10
    Changes: Database references
  • Version 1.2: 2020-06-17
    Changes: Data collection
  • Version 1.3: 2024-01-24
    Changes: Data collection, Database references, Refinement description