FliC encodes the major flagellar protein of E. coli and is thus fundamental to motility.
Figure 1 shows this biobrick used in conjunction with various promoters and ribosome binding sites to restore swimming in fliC knockout strains. This data is also shown as a histogram in Figure 2. These show that, with an appropriate promoter and RBS, this biobrick can restore swimming to almost wild-type levels.
We sequenced our fliC biobrick and found that it had the expected sequence, identical to fliC of the sequenced E. coli strain MG1655 at all positions except for the changes we had made to remove three PstI sites and one SpeI site. However, there were two coding differences between our biobrick and a previous fliC biobrick in the parts registry K777109. These differences are due to different source strains (We used MG1655 genomic DNA, they used E. coli strain K-12 substr. DH10B). It is unclear if these nonsynonymous changes alter flagella formation.
Flic Motility Swarm Assay
Figure 1: FliC Swarm Motility Assays.
(A) DS941, (B) DS941 ΔfliC,
(C) DS941 ΔfliC + pSB1C3 fliC (no promoter), (D) DS941 ΔfliC + J23100 (mutant promoter) fliC,
(E) DS941 ΔfliC + J23116-fliC(1), (F) DS941 ΔfliC + J23116-fliC(2),
(G) DS941 ΔfliC + J23106-fliC(1), (H) DS941 ΔfliC + J23106-fliC(2)
Flic Motility Histogram
Figure 2 - FliC Motility Histogram The promoters indicated in the histogram were used to drive the fliC biobrick K1463600 with the RBS B0034. Plasmids containing these constructs were used to complement a chromosomal fliC mutation. The diameter of swimming in a 16 hour swarm assay at 37 degrees is shown. The error bars indicate the range or results obtained in two repeats of the experiment. The strong J23100 promoter in this result contained a mutation rendering it inactive see K1463604.
For more information on the biobrick and methods used go to http://2014.igem.org/wiki/index.php?title=Team:Glasgow/Project/Mobility_Proteins#motA
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21INCOMPATIBLE WITH RFCIllegal BamHI site found at 1224
- 23COMPATIBLE WITH RFC
- 25INCOMPATIBLE WITH RFCIllegal AgeI site found at 301
Illegal AgeI site found at 709
- 1000COMPATIBLE WITH RFC
|Protein data table for BioBrick BBa_K1463600 automatically created by the BioBrick-AutoAnnotator version 1.0|
|Nucleotide sequence in RFC 10: (underlined part encodes the protein)|
ATGGCACAA ... CTCCAGGGTTAA
ORF from nucleotide position 1 to 1494 (excluding stop-codon)
|Amino acid sequence: (RFC 25 scars in shown in bold, other sequence features underlined; both given below)|
|Sequence features: (with their position in the amino acid sequence, see the list of supported features)|
|Amino acid composition:|
|Amino acid counting|
|Plot for hydrophobicity, charge, predicted secondary structure, solvent accessability, transmembrane helices and disulfid bridges|
|Alignments (obtained from PredictProtein.org)|
|Predictions (obtained from PredictProtein.org)|
|Subcellular Localization (reliability in brackets)|
|Gene Ontology (reliability in brackets)|
| The BioBrick-AutoAnnotator was created by TU-Munich 2013 iGEM team. For more information please see the documentation.|
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