Expression and characterization of recombinant murine lactoferrin

Area of Science:

• Biochemistry
• Immunology
• Molecular Biology

Background:

• Lactoferrin, an iron-binding glycoprotein, exhibits diverse functions in vitro, including iron homeostasis, antibacterial, and immune regulation.
• In vivo studies are limited by the lack of sufficient purified homospecies lactoferrin for animal models.
• Previous success in producing recombinant human lactoferrin provides a foundation for similar efforts.

Purpose of the Study:

• To produce recombinant murine lactoferrin using a similar expression strategy.
• To characterize the recombinant murine lactoferrin.
• To investigate species-specific differences in iron-binding properties between human and murine lactoferrin.

Main Methods:

• Production of recombinant murine lactoferrin via an Aspergillus expression system.
• Purification of recombinant murine lactoferrin to homogeneity.
• Characterization of size, immunoreactivity, N-terminal processing, glycosylation, and iron-binding properties.

Main Results:

• Recombinant murine lactoferrin was successfully produced, purified, and found to be similar to native murine lactoferrin in size and immunoreactivity.
• The recombinant protein exhibited correct N-terminal processing and glycosylation.
• While both human and murine lactoferrin bind iron in a 2:1 ratio, iron bound to murine lactoferrin was more acid-labile, indicating species-specific stability.

Conclusions:

• Recombinant murine lactoferrin production facilitates in vivo studies of lactoferrin's species-specific functions in mouse models.
• This advancement aids in understanding lactoferrin's role in iron homeostasis and immune responses.
• Demonstrated species-specific variation in iron-binding stability highlights the importance of using homospecies proteins in research.