Affinity-based capture and identification of protein effectors of the growth regulator ppGpp
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Koch Inst. for Cancer Research
- 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)
- 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
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