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Hyper-truncated Asn...
Hyper-truncated Asn355- And Asn391-glycans modulate the activity of neutrophil granule myeloperoxidase
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- Tjondro, Harry C. (author)
- Macquarie University
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- Ugonotti, Julian (author)
- Macquarie University
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- Kawahara, Rebeca (author)
- Macquarie University
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show more...
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- Chatterjee, Sayantani (author)
- Macquarie University
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- Chen, Siyun (author)
- University Of Oxford
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- Soltermann, Fabian (author)
- University Of Oxford
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- Hinneburg, Hannes (author)
- Macquarie University
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- Parker, Benjamin L. (author)
- University of Melbourne
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- Venkatakrishnan, Vignes (author)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för reumatologi och inflammationsforskning,Institute of Medicine, Department of Rheumatology and Inflammation Research
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- Loke, Ian (author)
- Cordlife Group
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- Dieckmann, Regis (author)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för reumatologi och inflammationsforskning,Institute of Medicine, Department of Rheumatology and Inflammation Research
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- Grant, Oliver C. (author)
- University of Georgia
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- Bylund, Johan, 1975 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för odontologi,Institute of Odontology
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- Rodger, Alison (author)
- Macquarie University
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- Woods, Robert J. (author)
- University of Georgia
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- Karlsson-Bengtsson, Anna, 1967 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för reumatologi och inflammationsforskning,Institute of Medicine, Department of Rheumatology and Inflammation Research
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- Struwe, Weston B. (author)
- University Of Oxford
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- Thaysen-Andersen, Morten (author)
- Macquarie University
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(creator_code:org_t)
- 2021
- 2021
- English.
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In: Journal of Biological Chemistry. - 0021-9258 .- 1083-351X. ; 296
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Abstract
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- Myeloperoxidase (MPO) plays essential roles in neutrophil-mediated immunity via the generation of reactive oxidation products. Complex carbohydrates decorate MPO at discrete sites, but their functional relevance remains elusive. To this end, we have characterised the structure–biosynthesis–activity relationship of neutrophil MPO (nMPO). Mass spectrometry demonstrated that nMPO carries both characteristic under-processed and hyper-truncated glycans. Occlusion of the Asn355/Asn391-glycosylation sites and the Asn323-/Asn483-glycans, located in the MPO dimerisation zone, was found to affect the local glycan processing, thereby providing a molecular basis of the site-specific nMPO glycosylation. Native mass spectrometry, mass photometry and glycopeptide profiling revealed significant molecular complexity of diprotomeric nMPO arising from heterogeneous glycosylation, oxidation, chlorination and polypeptide truncation variants and a previously unreported low-abundance monoprotomer. Longitudinal profiling of maturing, mature, granule-separated and pathogen-stimulated neutrophils demonstrated that nMPO is dynamically expressed during granulopoiesis, unevenly distributed across granules and degranulated upon activation. We also show that proMPO-to-MPO maturation occurs during early/mid-stage granulopoiesis. While similar global MPO glycosylation was observed across conditions, the conserved Asn355-/Asn391-sites displayed elevated glycan hyper-truncation, which correlated with higher enzyme activities of MPO in distinct granule populations. Enzymatic trimming of the Asn355-/Asn391-glycans recapitulated the activity gain and showed that nMPO carrying hyper-truncated glycans at these positions exhibits increased thermal stability, polypeptide accessibility and ceruloplasmin-mediated inhibition potential relative to native nMPO. Finally, molecular modelling revealed that hyper-truncated Asn355-glycans positioned in the MPO-ceruloplasmin interface are critical for uninterrupted inhibition. Here, through an innovative and comprehensive approach, we report novel functional roles of MPO glycans, providing new insight into neutrophil-mediated immunity.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Andra medicinska och farmaceutiska grundvetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Other Basic Medicine (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medicinal Chemistry (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Annan medicin och hälsovetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Other Medical and Health Sciences (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine (hsv//eng)
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- By the author/editor
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Tjondro, Harry C ...
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Ugonotti, Julian
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Kawahara, Rebeca
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Chatterjee, Saya ...
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Chen, Siyun
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Soltermann, Fabi ...
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show more...
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Hinneburg, Hanne ...
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Parker, Benjamin ...
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Venkatakrishnan, ...
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Loke, Ian
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Dieckmann, Regis
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Grant, Oliver C.
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Bylund, Johan, 1 ...
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Rodger, Alison
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Woods, Robert J.
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Karlsson-Bengtss ...
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Struwe, Weston B ...
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Thaysen-Andersen ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Biochemistry and ...
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Basic Medicine
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and Other Basic Medi ...
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Basic Medicine
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and Medicinal Chemis ...
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Other Medical an ...
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Basic Medicine
- Articles in the publication
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Journal of Biolo ...
- By the university
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Chalmers University of Technology
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University of Gothenburg