A novel secreted, cell-surface glycoprotein containing multiple epidermal growth factor-like repeats and one CUB domain is highly expressed in primary osteoblasts and bones.

The Journal of Biological Chemistry
Bo-Tsung WuRuey-Bing Yang

Abstract

We have previously identified a novel family of secreted, cell-surface proteins expressed in human vascular endothelium. To date, two family members have been described, sharing a characteristic domain structure including an amino-terminal signal peptide followed by multiple copies of epidermal growth factor (EGF)-like repeats, a spacer region, and one CUB domain at the carboxyl terminus. Thus, this family was termed SCUBE for signal peptide-CUB-EGF-like domain containing proteins. Here we described the identification and characterization of one additional member of the SCUBE family named SCUBE3 in humans, sharing an overall 60% protein identity and a similar domain structure with other family members. Real-time quantitative reverse transcriptase-PCR and Northern blot analyses revealed that this gene is highly expressed in primary osteoblasts and the long bones (humerus and femur), followed by a low level of expression in human umbilical vein endothelial cells and in heart. When overexpressed in human embryonic kidney 293T cells, the recombinant hSCUBE3 protein is a secreted glycoprotein that can form oligomers tethered to the cell surface. Interestingly, the secreted hSCUBE3 protein can be further proteolytically processed by ...Continue Reading

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