Abstract:
:Comparative phosphoproteomics of Mycobacterium tuberculosis (Mtb)- and Mycobacterium bovis BCG (BCG)-infected macrophages could be instrumental in understanding the characteristic post-translational modifications of host proteins and their subsequent involvement in determining Mtb pathogenesis. To identify proteins acquiring a distinct phosphorylation status, herein, we compared the phosphorylation profile of macrophages upon exposure to Mtb and BCG. We observed a significant dephosphorylation of proteins following Mtb infection relative to those with uninfected or BCG-infected cells. A comprehensive tandem mass tag mass spectrometry (MS) approach detected ∼10% phosphosites on a variety of host proteins that are modulated in response to infection. Interestingly, the innate immune-enhancing interferon (IFN)-stimulated genes were identified as a class of proteins differentially phosphorylated during infection, including the cytosolic RNA sensor RIG-I, which has been implicated in the immune response to bacterial infection. We show that Mtb infection results in the activation of RIG-I in primary human macrophages. Studies using RIG-I knockout macrophages reveal that the Mtb-mediated activation of RIG-I promotes IFN-β, IL-1α, and IL-1β levels, dampens autophagy, and facilitates intracellular Mtb survival. To our knowledge, this is the first study providing exhaustive information on relative and quantitative changes in the global phosphoproteome profile of host macrophages that can be further explored in designing novel anti-TB drug targets. The peptide identification and MS/MS spectra have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifier PXD013171.
journal_name
J Proteome Resjournal_title
Journal of proteome researchauthors
Choudhary E,Bullen CK,Goel R,Singh AK,Praharaj M,Thakur P,Dhiman R,Bishai WR,Agarwal Ndoi
10.1021/acs.jproteome.9b00895subject
Has Abstractpub_date
2020-06-05 00:00:00pages
2316-2336issue
6eissn
1535-3893issn
1535-3907journal_volume
19pub_type
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