Fibrillin-1 - P35555 (FBN1_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Structural component of the 10-12 nm diameter microfibrils of the extracellular matrix, which conveys both structural and regulatory properties to load-bearing connective tissues (PubMed:1860873, PubMed:15062093). Fibrillin-1-containing microfibrils provide long-term force bearing structural support. In tissues such as the lung, blood vessels and skin, microfibrils form the periphery of the elastic fiber, acting as a scaffold for the deposition of elastin. In addition, microfibrils can occur as elastin-independent networks in tissues such as the ciliary zonule, tendon, cornea and glomerulus where they provide tensile strength and have anchoring roles. Fibrillin-1 also plays a key role in tissue homeostasis through specific interactions with growth factors, such as the bone morphogenetic proteins (BMPs), growth and differentiation factors (GDFs) and latent transforming growth factor-beta-binding proteins (LTBPs), cell-surface integrins and other extracellular matrix protein and proteoglycan components (PubMed:27026396). Regulates osteoblast maturation by controlling TGF-beta bioavailability and calibrating TGF-beta and BMP levels, respectively (By similarity). Negatively regulates osteoclastogenesis by binding and sequestering an osteoclast differentiation and activation factor TNFSF11. This leads to disruption of TNFSF11-induced Ca(2+) signaling and impairment of TNFSF11-mediated nuclear translocation and activation of transcription factor NFATC1 which regulates genes important for osteoclast differentiation and function (PubMed:24039232). Mediates cell adhesion via its binding to cell surface receptors integrins ITGAV:ITGB3 and ITGA5:ITGB1 (PubMed:12807887, PubMed:17158881). Binds heparin and this interaction has an important role in the assembly of microfibrils (PubMed:11461921). UniProt
Pathway Maps
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Subunit Structure
Interacts with COL16A1 (PubMed:15165854). Interacts with integrin alpha-V/beta-3 (PubMed:15062093). Interacts with ADAMTS10; this interaction promotes microfibril assembly (PubMed:21402694). Interacts with THSD4; this interaction promotes fibril formation (By similarity). Interacts (via N-terminal domain) with FBLN2, FBLN4 and FBLN5 (PubMed:15790312, PubMed:17255108). Interacts with ELN (PubMed:15790312). Forms a ternary complex with ELN and FBLN2 or FBLN5 and a significant interaction with ELN seen only in the presence of FBLN2 or FBLN5 (PubMed:17255108). Interacts (via N-terminal domain) with LTBP2 (via C-terminal domain) in a Ca(+2)-dependent manner (PubMed:17293099). Interacts (via N-terminal domain) with LTBP1 (via C-terminal domain) (PubMed:17293099). Interacts with integrins ITGA5:ITGB1, ITGAV:ITGB3 and ITGAV:ITGB6 (PubMed:17158881, PubMed:12807887). Interacts (via N-terminal domain) with BMP2, BMP4, BMP7, BMP10 and GDF5 (PubMed:18339631). Interacts (via N-terminal domain) with MFAP2 and MFAP5 (PubMed:15131124). Interacts with ADAMTSL5 (PubMed:23010571). Interacts with MFAP4 (PubMed:26601954). Interacts (via N-terminal domain) with TNFSF11 in a Ca(+2)-dependent manner (PubMed:24039232). UniProt
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