Molecular interaction between natural IgG and ficolin - Mechanistic insights on adaptive-innate immune crosstalk

Saswati Panda, Jing Zhang, Lifeng Yang, Ganesh S. Anand, Jeak L. Ding

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Recently, we found that natural IgG (nIgG; a non-specific immunoglobulin of adaptive immunity) is not quiescent, but plays a crucial role in immediate immune defense by collaborating with ficolin (an innate immune protein). However, how the nIgG and ficolin interplay and what factors control the complex formation during infection is unknown. Here, we found that mild acidosis and hypocalcaemia induced by infection- inflammation condition increased the nIgG:ficolin complex formation. Hydrogen-deuterium exchange mass spectrometry delineated the binding interfaces to the CH2-CH3 region of nIgG Fc and P-subdomain of ficolin FBG domain. Infection condition exposes novel binding sites. Site-directed mutagenesis and surface plasmon resonance analyses of peptides, derived from nIgG and ficolin, defined the interacting residues between the proteins. These results provide mechanistic insights on the interaction between two molecules representing the adaptive and innate immune pathways, prompting potential development of immunomodulatory/prophylactic peptides tunable to prevailing infection conditions.

Original languageEnglish (US)
Article number3675
JournalScientific reports
Volume4
DOIs
StatePublished - Apr 1 2015

All Science Journal Classification (ASJC) codes

  • General

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