Peroxidasin-mediated bromine enrichment of basement membranes

Cuiwen He, Wenxin Song, Thomas A. Weston, Caitlyn Tran, Ira Kurtz, Jonathan E. Zuckerman, Paul Guagliardo, Jeffrey H. Miner, Sergey V. Ivanov, Jeremy Bougoure, Billy G. Hudson, Selene Colon, Paul A. Voziyan, Gautam Bhave, Loren G. Fong, Stephen G. Young, Haibo Jiang

Research output: Contribution to journalArticle

Abstract

Bromine and peroxidasin (an extracellular peroxidase) are essential for generating sulfilimine cross-links between a methionine and a hydroxylysine within collagen IV, a basement membrane protein. The sulfilimine cross-links increase the structural integrity of basement membranes. The formation of sulfilimine cross-links depends on the ability of peroxidasin to use bromide and hydrogen peroxide substrates to produce hypobromous acid (HOBr). Once a sulfilimine cross-link is created, bromide is released into the extracellular space and becomes available for reutilization. Whether the HOBr generated by peroxidasin is used very selectively for creating sulfilimine cross-links or whether it also causes oxidative damage to bystander molecules (e.g., generating bromotyrosine residues in basement membrane proteins) is unclear. To examine this issue, we used nanoscale secondary ion mass spectrometry (NanoSIMS) imaging to define the distribution of bromine in mammalian tissues. We observed striking enrichment of bromine (79Br, 81Br) in basement membranes of normal human and mouse kidneys. In peroxidasin knockout mice, bromine enrichment of basement membranes of kidneys was reduced by ∼85%. Proteomic studies revealed bromination of tyrosine-1485 in the NC1 domain of α2 collagen IV from kidneys of wild-type mice; the same tyrosine was brominated in collagen IV from human kidney. Bromination of tyrosine-1485 was reduced by >90% in kidneys of peroxidasin knockout mice. Thus, in addition to promoting sulfilimine cross-links in collagen IV, peroxidasin can also brominate a bystander tyrosine. Also, the fact that bromine enrichment is largely confined to basement membranes implies that peroxidasin activity is largely restricted to basement membranes in mammalian tissues.

Original languageEnglish
Pages (from-to)15827-15836
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number27
DOIs
StatePublished - Jul 7 2020

Keywords

  • Bromine
  • Bromotyrosine
  • Collagen IV
  • NanoSIMS imaging
  • Sulfilimine cross-links

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  • Cite this

    He, C., Song, W., Weston, T. A., Tran, C., Kurtz, I., Zuckerman, J. E., Guagliardo, P., Miner, J. H., Ivanov, S. V., Bougoure, J., Hudson, B. G., Colon, S., Voziyan, P. A., Bhave, G., Fong, L. G., Young, S. G., & Jiang, H. (2020). Peroxidasin-mediated bromine enrichment of basement membranes. Proceedings of the National Academy of Sciences of the United States of America, 117(27), 15827-15836. https://doi.org/10.1073/pnas.2007749117