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F3542 Sigma-Aldrich

Fibronectin Fragment III1-C human

recombinant, expressed in E. coli, lyophilized powder

Synonym: FF III1-C



Related Categories Application Index, Biochemicals and Reagents, Cell Biology, Cell Signaling Enzymes, Cell Signaling and Neuroscience,
Quality Level   200
biological source   human
recombinant   expressed in E. coli
form   lyophilized powder
quality   essentially salt free
mol wt   8-15 kDa
packaging   pkg of 0.5 mg
application(s)   cell culture | mammalian: suitable
surface coverage   0.45 μg/cm2
solubility   Tris-buffered saline: soluble 1.00-1.10 mg/mL, clear, colorless
shipped in   ambient
storage temp.   −20°C
Gene Information   human ... FN1(2335)


General description

Fibronectins are made of two subunits linked by disulfide bonds at the C terminal. In the extracellular matrix fibrils, fibronectins are further disulfide bonded into high molecular weight polymers. Fibronectin subunits vary in size between approximately 235 and 270 kD depending on tissue and species. Each subunit is made of repeating modules of three types: I, II, and III. There are 12 type I repeats, approximately 45 amino acids long, clustered in three groups, two adjacent type II repeats each 60 amino acids long, and 15-17 type III repeats each about 90 amino acids long. Type I and type II each contains two disulfide bonds, while type III lacks disulfide bonds. There are two free sulfhydryl groups per subunit at the type III repeat.

Recently a new region, type III1 repeat cloned from human placenta cDNA, was reported to participate in matrix formation. In an experiment employing antibodies for the analysisof fibronectin domains required for matrix assembly, the epitope that inhibited binding and insolubilization of labeled plasma fibronectin by fibroblasts, was identified on the type III1 and type I modules of fibronectin. This suggested a role for type III1 and type I in the mediation of fibronectin assembly. This finding was further supported by the ability of the 14 kDa fragment from the first two type III repeats of fibronectin to inhibit fibronectin matrix assembly.4 Recently recombinant fragment III1-C, modeled after the C-terminal two-thirds of the III1 repeat, was found to bind to fibronectin and induce spontaneous disulfide crosslinking of the fibronectin molecules into multimers, which resemble matrix fibrils


0.5 mg in glass bottle


Epithelial cells, mesenchymal cells, neuronal cells, fibroblasts, neural crest cells, endothelial cells

Biochem/physiol Actions

Promotes cross-linking of fibronectin to form matrix fibril-like multimers.


Package size based on protein content

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


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Animal cells and tissue culture techniques are constantly improved to optimize in vitro cell culture conditions. Extracellular Matrix (ECM) proteins coating, chemical or physical modification of the ...
Keywords: Adhesion, Angiogenesis, Apoptosis, Asymmetric synthesis, Cancer, Cell attachment, Cell culture, Cell proliferation, Coagulation, Endocrinology, Growth factors, Hormones

Fibronectin (FN)

Fibronectin (FN) is a multifunctional, extracellular matrix glycoprotein composed of two nearly identical disulfide bound polypeptides of molecular weight 220 kDa. Cellular fibronectin is structurall...
George Sitterley
BioFiles 2008, 3.8, 8.
Keywords: Adhesion, Cell culture, transformation

What is the Extracellular Matrix?

The extracellular matrix (ECM) is secreted by cells and surrounds them in tissues. It has long been understood to be the structural support for cells since its characteristics set the characteristics...
Keywords: Adhesion, Cell culture, Cellular processes, Epimerizations, Growth factors, Immobilization, Sulfations

Peer-Reviewed Papers


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