Optimizing prolyl hydroxylation for functional recombinant collagen in Escherichia coli

Area of Science:

• Biochemistry
• Biomaterials Science

Background:

• Collagen is a vital extracellular matrix protein with broad applications.
• Recombinant collagen production in E. coli is cost-effective but lacks crucial post-translational modifications like proline hydroxylation.
• Prolyl hydroxylases (e.g., BaP4H, DsP4H, L593) show potential for modifying recombinant collagen in E. coli.

Purpose of the Study:

• To investigate the structural and functional impact of recombinant human type III collagen modified by different prolyl hydroxylases.
• To determine proline hydroxylation levels, sites, and their correlation with collagen triple helix stability and biological function.

Main Methods:

• Expression of recombinant human type III collagen in E. coli.
• Modification using prolyl hydroxylases (BaP4H, DsP4H, L593).
• Analysis of proline hydroxylation percentage and sites, circular dichroism spectra, and cell adhesion assays.

Main Results:

• L593 enzyme resulted in the highest proline hydroxylation percentage.
• Proline hydroxylation was linked to triple helix formation but not necessarily stability.
• Recombinant collagen modified by BaP4H and L593 showed significantly enhanced cell adhesion, correlated with triple helix structure.

Conclusions:

• Prolyl hydroxylase modification, particularly with L593, improves recombinant collagen properties.
• Enhanced proline hydroxylation positively impacts cell adhesion through triple helix structure.
• Findings support improved industrial production and functional applications of recombinant collagen.