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ASPN Q9BXN1

Asporin (牙周膜相关蛋白 1) (PLAP-1)

蛋白质信息 (UniProt)

Asporin (牙周膜相关蛋白 1) (PLAP-1)

Q9BXN1

功能描述

负向调节牙周膜(PDL)分化和矿化,以确保牙周膜不发生骨化,并维持牙齿支持系统的稳态。通过阻止BMP2与BMPR1B/BMP type-1B receptor结合,抑制BMP2诱导的牙周膜细胞细胞分化,从而抑制BMP依赖的SMAD蛋白激活(By similarity)。关节软骨中TGF-beta的关键调节因子,在软骨稳态和骨关节炎(OA)发病机制中起重要作用。通过阻断细胞表面的TGF-beta/受体相互作用并抑制典型的TGF-beta/Smad信号,负向调节关节软骨中的软骨形成。结合钙并在成骨细胞驱动的胶原生物矿化活动中发挥作用。 {ECO:0000250, ECO:0000269|PubMed:17827158, ECO:0000269|PubMed:19589127}。

组织特异性

Higher levels in osteoarthritic articular cartilage, aorta, uterus. Moderate expression in small intestine, heart, liver, bladder, ovary, stomach, and in the adrenal, thyroid, and mammary glands. Low expression in trachea, bone marrow, and lung. Colocalizes with TGFB1 in chondrocytes within osteoarthritic (OA) lesions of articular cartilage.

亚细胞定位

Secreted, extracellular space, extracellular matrix

关键词

Biomineralization Calcium Direct protein sequencing Disulfide bond Extracellular matrix Glycoprotein Leucine-rich repeat Proteomics identification Reference proteome Repeat