Spider Silk 1x Subunit "W" with Met (ATG) start codon
Spider silk subunit native sequence; contains one elasticity domain and one strength domain, and Met (ATG) start codon on 5’ end.
IMPORTANT NOTE: This part uses Assembly Standard #23 (Silver Fusion) scar sites, which the sequence data below and on composite parts using this part will not reflect this scar sequence (it shows Assembly Standard #10 scars).
Usage and Biology
The sequence for this subunit was derived from the 2E silk subunit from Brooks et al. (2008), which is based on the native sequence of the MaSp2 silk gene in Argiope aurantia. See part BBa_K844002 for additional sequence details. This part contains an added Met (ATG) codon at the 5’ end and is designed for use as the first subunit in a longer spider silk construct. This part should be followed by numerous repeats of the BBa_K844002 silk subunit, and the silk coding region should end with a BBa_K844000 part, which contains a 10-Histidine tag and a double stop codon (TAATAA)
The silk subunit contains four main domains: two elasticity domain, a linker domain, and a strength domain. The elasticity domains contains sequences coding for beta-helices and beta-spiral in the protein; these structures increase the elasticity of the spider silk. The linker domain joins the strength and elasticity domains together. The strength domain will form beta-sheets and strengthen the silk fibers by cross-linking silk strands.
BBa_K844002 – The “U” silk subunit with 1 elasticity domain and one strength domain without any added Met (ATG) codons.
Brooks AE, Stricker SM, Joshi SB, Kamerzell TJ, Middaugh CR, and Lewis RV. 2008. Properties of synthetic spider silk fibers based on Argiope aurantia MaSp2. Biomacromolecules 9:1506–10.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21COMPATIBLE WITH RFC
- 23COMPATIBLE WITH RFC
- 25Illegal NgoMIV site found at 22
- 1000COMPATIBLE WITH RFC
Functional Parameters: Austin_UTexas
Burden Imposed by this Part:
Burden is the percent reduction in the growth rate of E. coli cells transformed with a plasmid containing this BioBrick (± values are 95% confidence limits). This BioBrick did not exhibit a burden that was significantly greater than zero (i.e., it appears to have little to no impact on growth). Therefore, users can depend on this part to remain stable for many bacterial cell divisions and in large culture volumes. Refer to any one of the BBa_K3174002 - BBa_K3174007 pages for more information on the methods, an explanation of the sources of burden, and other conclusions from a large-scale measurement project conducted by the 2019 Austin_UTexas team.
This functional parameter was added by the 2020 Austin_UTexas team.