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Updated: Jul 5, 2026

Differentiation of Functional Osteoclasts from Human Peripheral Blood CD14+ Monocytes
Published on: January 27, 2023
Structure-function of the TNF receptor-like cysteine-rich domain of osteoprotegerin
Joon Shin1, Young-Mee Kim, Song-Zhe Li
1Department of Biochemistry and Protein Network Research Center, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea.
Abstract:
Osteoprotegerin (OPG) is a soluble decoy receptor that inhibits osteoclastogenesis and is closely associated with bone resorption processes. We have designed and determined the solution structures of potent OPG analogue peptides, derived from sequences of the cysteine-rich domain of OPG. The inhibitory effects of the peptides on osteoclastogenesis are dose-dependent (10(-6) M-10(-4) M), and the activity of the linear peptide at 10(-4) M is ten-fold higher than that of the cyclic OPG peptide. Both linear and cyclic peptides have a beta-turn-like conformation and the cyclic peptide has a rigid conformation, suggesting that structural flexibility is an important factor for receptor binding. Based on structural and biochemical information about RANKL and the OPG peptides, we suggest that complex formation between the peptide and RANKL is mediated by both hydrophobic and hydrogen bonding interactions. These results provide structural insights that should aid in the design of peptidyl-mimetic inhibitors for treating metabolic bone diseases caused by abnormal osteoclast recruitment.
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