Salmonella enterica serovar Typhimurium chemoreceptor Tsr (taxis to serine and repellents) ligand-binding domain in complex with l-serine

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.242 

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Ligand Structure Quality Assessment 

This is version 1.1 of the entry. See complete history


Bacterial vampirism mediated through taxis to serum.

Glenn, S.J.Gentry-Lear, Z.Shavlik, M.Harms, M.J.Asaki, T.J.Baylink, A.

(2024) Elife 12

  • DOI: https://doi.org/10.7554/eLife.93178
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacteria of the family Enterobacteriaceae are associated with gastrointestinal (GI) bleeding and bacteremia and are a leading cause of death, from sepsis, for individuals with inflammatory bowel diseases. The bacterial behaviors and mechanisms underlying why these bacteria are prone to bloodstream entry remain poorly understood. Herein, we report that clinical isolates of non-typhoidal Salmonella enterica serovars, Escherichia coli , and Citrobacter koseri are rapidly attracted toward sources of human serum. To simulate GI bleeding, we utilized an injection-based microfluidics device and found that femtoliter volumes of human serum are sufficient to induce bacterial attraction to the serum source. This response is orchestrated through chemotaxis and the chemoattractant L-serine, an amino acid abundant in serum that is recognized through direct binding by the chemoreceptor Tsr. We report the first crystal structures of Salmonella Typhimurium Tsr in complex with L-serine and identify a conserved amino acid recognition motif for L-serine shared among Tsr orthologues. We find Tsr to be widely conserved among Enterobacteriaceae and numerous World Health Organization priority pathogens associated with bloodstream infections. Lastly, we find that Enterobacteriaceae use human serum as a source of nutrients for growth and that chemotaxis and the chemoreceptor Tsr provide a competitive advantage for migration into enterohemorrhagic lesions. We define this bacterial behavior of taxis toward serum, colonization of hemorrhagic lesions, and the consumption of serum nutrients as 'bacterial vampirism', which may relate to the proclivity of Enterobacteriaceae for bloodstream infections.

  • Organizational Affiliation

    Washington State University, Department of Veterinary Microbiology and Pathology, Pullman, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Methyl-accepting chemotaxis protein
A, B, C, D, E
156Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: DPS76_02420
Find proteins for A0A5W2VA06 (Salmonella typhimurium)
Explore A0A5W2VA06 
Go to UniProtKB:  A0A5W2VA06
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A5W2VA06
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SER (Subject of Investigation/LOI)
Query on SER

Download Ideal Coordinates CCD File 
H [auth A],
O [auth B],
S [auth C],
W [auth D],
Y [auth E]
C3 H7 N O3
Query on CL

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
M [auth B]
N [auth B]
Q [auth C]
F [auth A],
G [auth A],
M [auth B],
N [auth B],
Q [auth C],
R [auth C],
U [auth D],
V [auth D],
X [auth E]
Query on NA

Download Ideal Coordinates CCD File 
I [auth B]
J [auth B]
K [auth B]
L [auth B]
P [auth C]
I [auth B],
J [auth B],
K [auth B],
L [auth B],
P [auth C],
T [auth D]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.242 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.807α = 90
b = 75.231β = 116.47
c = 129.588γ = 90
Software Package:
Software NamePurpose
DIALSdata scaling
BOSdata collection
DIALSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States1K99AI148587
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United States4R00AI148587-03

Revision History  (Full details and data files)

  • Version 1.0: 2024-05-15
    Type: Initial release
  • Version 1.1: 2024-06-12
    Changes: Database references