Abstract
Insects possess powerful immune systems that have evolved to defend against wounding and environmental pathogens such as bacteria, fungi, protozoans, and parasitoids. This surprising sophistication is accomplished through the activation of multiple immune pathways comprised of a large array of components, many of which have been identified and studied in detail using both genetic manipulations and traditional biochemical techniques. Recent advances indicate that certain pathways activate arrays of proteins that interact to form large functional complexes. Here we discuss three examples from multiple insects that exemplify such processes, including pathogen recognition, melanization, and coagulation. The functionality of each depends on integrating recognition with the recruitment of immune effectors capable of healing wounds and destroying pathogens. In both melanization and coagulation, protein interactions also appear to be essential for enzymatic activities tied to the formation of melanin and for the recruitment of hemocytes. The importance of these immune complexes is highlighted by the evolution of mechanisms in pathogens to disrupt their formation, an example of which is provided. While technically difficult to study, and not always readily amenable to dissection through genetics, modern mass spectrometry has become an indispensable tool in the study of these higher-order protein interactions. The formation of immune complexes should be viewed as an essential and emerging frontier in the study of insect immunity.
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Abbreviations
- PPO:
-
Prophenoloxidase
- PO:
-
Phenoloxidase
- MC:
-
Melanization complex
- IC:
-
Immune complex
- HP:
-
Hemolymph proteases
- PAP:
-
Phenoloxidase-activating protease
- SPH:
-
Serine protease homolog
- PTU:
-
Phenylthiourea
- KD:
-
Knockdown
- CLIP:
-
An arthropod-specific class of SPs and SPHs
- LPS:
-
Lipopolysaccharide
- Tyr:
-
Tyrosine
- DOPA:
-
Dihydroxyphenylalanine
- GFP:
-
Green fluorescent protein
- B-cad:
-
Biotin-cadaverine
- PSP:
-
Plasmatocyte spreading peptide
- ROS:
-
Reactive oxygen species
- AMP:
-
Antimicrobial peptide
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- PAMP:
-
Pathogen-associated molecular pattern
- DA:
-
Dopamine
- SFP:
-
Substrate-free plasma
- PRR:
-
Pattern recognition receptor
- CD:
-
N-terminal catalytic domain
- RD:
-
C-terminal repeat domain
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Clark, K.D. (2020). Insect Hemolymph Immune Complexes. In: Hoeger, U., Harris, J. (eds) Vertebrate and Invertebrate Respiratory Proteins, Lipoproteins and other Body Fluid Proteins. Subcellular Biochemistry, vol 94. Springer, Cham. https://doi.org/10.1007/978-3-030-41769-7_5
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