Journal
JOURNAL OF PROTEOME RESEARCH
Volume 16, Issue 1, Pages 247-263Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jproteome.6b00685
Keywords
Mycobacterium tuberculosis; tuberculosis; microparticle; macrophage; N-glycosylation; LC-MS/MS; exoglycosidase; glycoproteome; proteomics; glycoprofiling; glycomics
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Funding
- Cancer Institute, NSW, Australia
- Macquarie University Research Development Grant (MQRDG)
- international Macquarie University Research Scholarship (iMQRES)
- Australian Cystic Fibrosis postgraduate studentship
- NHMRC Centre for Research Excellence in Tuberculosis Control [APP1043225]
- NHMRC [APP570771]
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Tuberculosis (TB) remains a prevalent and lethal infectious disease. The glycdbiology associated with Mycobacterium tuberculosis infection of frontline alveolar macrophages is still unresolved. Herein, we investigated the regulation of protein. N-glycosylation in human macrophages and their secreted microparticles (MPs) used for intercellular communication upon M. tb infection. LC-MS/MS-based proteomics and glycomics were performed to monitor the regulation of glycosylation enzymes and receptors and the N-glycome in in vitro-differentiated macrophages and in isolated MPs upon M. tb infection. Infection promoted a dramatic regulation of the macrophage proteome. Most notably, significant infection-dependent down-regulation (4-26 fold) of 11 lysosomal exoglycosidases, e.g., beta-galactosidase, beta-hexosaminidases and alpha-/beta-mannosidases, was observed. Relative weak infection-driven transcriptional regulation of these exoglycosidases and a stronger augmentation of the extracellular hexosaminidase activity demonstrated that the lysosome-centric changes may originate predominantly from infection-induced secretion of the lysosomal content. The macrophages showed heterogeneous N-glycan profiles and displayed:significant up-regulation of complex-type glycosylation and concomitant down-regulation of paucimannosylation upon infection: Complementary. intact N-glycopeptide analysis supported a subcellular-specific manipulation of the glycosylation machinery and altered glycosylation patterns of lysosomal N-glycoproteins within infected macrophages. Interestingly, the corresponding macrophage-derived MPs displayed unique N-glycome and proteome signatures supporting a preferential packaging from plasma membranes. The MPs were devoid of infection-dependent N-glycosylation signatures, but interestingly displayed increased levels of the glyco-initiating oligosaccharyltransferase complex and associated alpha-glucosidases that correlated with increased, formation, N-glycan precursor levels and N-glycan density of infected MPs. In conclusion, this system-wide study provides new insight into the host- and patliogen-driven N-glycoproteome manipulation of macrophages in TB.
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