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Published 3 September 2001. doi:10.1083/jcb.200102034
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© The Rockefeller University Press, 0021-9525/2001/9/1081 $5.00
The Journal of Cell Biology, Volume 154, Number 5, September 3, 2001 1081-1088

Article

 A novel fibronectin binding site required for fibronectin fibril growth during matrix assembly

Jan L. Sechler, Hongwei Rao, Anne Marie Cumiskey, Irbert Vega-Colón, Michael S. Smith, Takatoshi Murata and Jean E. Schwarzbauer

Department of Molecular Biology, Princeton University, Princeton, NJ 08544

Address correspondence to Jean E. Schwarzbauer, Princeton University, Department of Molecular Biology, Princeton, NJ 08544-1014. Tel.: (609) 258-2893. Fax: (609) 258-1035. E-mail: jschwarzbauer{at}molbio.princeton.edu

Fibronectin (FN) assembly into a fibrillar extracellular matrix is a stepwise process requiring participation from multiple FN domains. Fibril formation is regulated in part by segments within the first seven type III repeats (III1–7). To define the specific function(s) of this region, recombinant FNs (recFNs) containing an overlapping set of deletions were tested for the ability to assemble into fibrils. Surprisingly, recFN lacking type III repeat III1 (FN{Delta}III1), which contains a cryptic FN binding site and has been suggested to be essential for fibril assembly, formed a matrix identical in all respects to a native FN matrix. Similarly, displacement of the cell binding domain in repeats III9–10 to a position close to the NH2-terminal assembly domain, as well as a large deletion spanning repeats III4–7, had no effect on assembly. In contrast, two deletions that included repeat III2, {Delta}III1–2 and {Delta}III2–5, caused significant reductions in fibril elongation, although binding of FN to the cell surface and initiation of assembly still proceeded. Using individual repeats in binding assays, we show that III2 but not III1 contains an FN binding site. Thus, these results pinpoint repeat III2 as an important module for FN–FN interactions during fibril growth.

Key Words: fibronectin; matrix assembly; type III repeats; RGD sequence; self-association


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