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Title: Affinity-based capture and identification of protein effectors of the growth regulator ppGpp

Journal Article · · Nature Chemical Biology
 [1]; ORCiD logo [1];  [1];  [2];  [1];  [3]; ORCiD logo [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Koch Inst. for Cancer Research
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Koch Inst. for Cancer Research; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Environmental Health Sciences; Broad Inst. of Harvard and MIT, Cambridge, MA (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Howard Hughes Medical Inst.

The nucleotide ppGpp is a highly conserved regulatory molecule in bacteria that helps tune growth rate to nutrient availability. Despite decades of study, how ppGpp regulates growth remains poorly understood. Here, we developed and validated a capture-compound mass spectrometry approach that identified >50 putative ppGpp targets in Escherichia coli. These targets control many key cellular processes and include 13 enzymes required for nucleotide synthesis. We demonstrated that ppGpp inhibits the de novo synthesis of all purine nucleotides by directly targeting the enzyme PurF. By solving a structure of PurF bound to ppGpp, we designed a mutation that ablates ppGpp-based regulation, leading to dysregulation of purine-nucleotide synthesis following ppGpp accumulation. Collectively, our results provide new insights into ppGpp-based growth control and a nearly comprehensive set of targets for future exploration. Furthermore, the capture compounds developed should also enable the rapid identification of ppGpp targets in any species, including pathogens.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-06CH11357; NSF-0070319; R01GM082899
OSTI ID:
1569903
Journal Information:
Nature Chemical Biology, Vol. 15, Issue 2; ISSN 1552-4450
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 104 works
Citation information provided by
Web of Science

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Cited By (11)

Crystal Structure of the Chloroplastic Glutamine Phosphoribosylpyrophosphate Amidotransferase GPRAT2 From Arabidopsis thaliana journal February 2020
Magic spot nucleotides: tunable target-specific chemoenzymatic synthesis journal January 2019
The Stringent Response Inhibits DNA Replication Initiation in E. coli by Modulating Supercoiling of oriC journal July 2019
Bacterial Longevity Requires Protein Synthesis and a Stringent Response journal October 2019
The Ps and Qs of alarmone synthesis in Staphylococcus aureus journal October 2019
How the initiating ribosome copes with ppGpp to translate mRNAs journal January 2020
Characterization of Autoinducer-3 Structure and Biosynthesis in E. coli journal January 2020
Evolution of (p)ppGpp-HPRT regulation through diversification of an allosteric oligomeric interaction journal September 2019
The Link between Purine Metabolism and Production of Antibiotics in Streptomyces journal June 2019
Genome-wide effects on Escherichia coli transcription from ppGpp binding to its two sites on RNA polymerase journal April 2019
Inorganic Polyphosphate Accumulation in Escherichia coli Is Regulated by DksA but Not by (p)ppGpp journal February 2019