Abstract
Functionalized collagen-mimetic peptides (CMPs) have been widely used in the preparation of collagen-related biomaterials. Among the reported results, the induced noncovalent interactions between the implanted functional groups or moieties were frequently the key elements to promote the self-assembly of small CMPs. In this work, we designed and synthesized a series of glycosylated CMPs in which 4-O-[β-d-galactopyranosyl]-(2S,4R)-4-hydroxyproline (Hyp(Gal)) was incorporated to explore the effects of glycosylation on the stability and assembly of collagen triple helices. Circular dichroism measurements showed that glycosylation of hydroxyproline slightly destabilized the collagen triple helices, but did not reduce their refolding rate. Compared to non-glycosylated CMPs, the incorporation of Hyp(Gal) speeded up the assembly of CMPs, indicating that this modification could assist the self-assembly of CMPs into higher-order structures, such as fibrils. O-Galactosylation of hydroxyproline imposes contrary effects on the triple helix stability and the self-assembly rate of collagen triple helices, exhibiting a piece of important and useful information for designing collagen-related biomaterials. Our finding also suggests that instead of stabilizing the triple helical conformation of CMPs, installing additional forces between CMPs could be a crucial factor to promote the assembly of CMPs into large-scale constructs.
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Acknowledgments
This work was supported by the Taiwan Ministry of Science and Technology (MOST 104-2113-M-007-013, 105-2113-M-007-018) and National Tsing Hua University (105N501CE1). We are grateful to the National Center for High-performance Computing (NCHC) for computer time and facilities.
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Huang, PW., Chang, JM. & Horng, JC. Effects of glycosylated (2S,4R)-hydroxyproline on the stability and assembly of collagen triple helices. Amino Acids 48, 2765–2772 (2016). https://doi.org/10.1007/s00726-016-2312-2
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DOI: https://doi.org/10.1007/s00726-016-2312-2