Team:Stanford-Brown/Biomining/Harvesting

From 2012.igem.org

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We inserted the following metal-binding sequences into the FliC disposable region:
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We inserted the following metal-binding sequences into the FliC disposable region. Nucleotide sequences were obtained by reverse translating peptide sequences with codons optimized for E. coli.
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"HTTC" (Cu+2)
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{| class="wikitable" style="text-align: left;"
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!colspan="3"|Metal Ion-Binding Peptides
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|-
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|Peptide Name
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|Binds to
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|Sequences
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|-
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|rowspan="2"|HTTC
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|rowspan="2"|Cu 2+
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|'''Peptide''': HNLGMNHDLQGERPYVTEGC
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|'''Nucleotide''': CATAACCTGGGCATGAACCATGATCTGCAGGGCGAACGCCCGTATGTGACCGAAGGCTGC
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HNLGMNHDLQGERPYVTEGC
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|}
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-->CATAACCTGGGCATGAACCATGATCTGCAGGGCGAACGCCCGTATGTGACCGAAGGCTGC
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"HypB1" (Cu+1)
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"HTTC" (binds Cu 2+ ions)
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peptide sequence: HNLGMNHDLQGERPYVTEGC
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nucleotide sequence: CATAACCTGGGCATGAACCATGATCTGCAGGGCGAACGCCCGTATGTGACCGAAGGCTGC
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"HypB1" (binds Cu 1+ ions)
CTTCGCG
CTTCGCG
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-->TGCACCACCTGCGGCTGCGGC
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nucleotide sequence: TGCACCACCTGCGGCTGCGGC
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"HypB2" (Cu+1)
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"HypB2" (binds Cu 1+ ions)
MCTTCGCGEG
MCTTCGCGEG
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-->ATGTGCACCACCTGCGGCTGCGGCGAAGGC
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nucleotide sequence: ATGTGCACCACCTGCGGCTGCGGCGAAGGC
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HTTC4 - inserted fully
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HTTC6 - close to perfect insertion (couple of bases off)
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HTTC8 - inserted fully
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HTTC9 - inserted fully
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HTTC10 - close to perfect insertion
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HypB14 - inserted fully
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HypB24 - inserted fully
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HypB24 - inserted fully
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Undergoing metal-binding assays now and flagella imaging on SEM.
Undergoing metal-binding assays now and flagella imaging on SEM.

Revision as of 05:32, 3 October 2012


Harvesting

The FliC gene codes for flagellin, a protein that arranges itself in a hollow cylinder to form the filament of a bacterial flagellum. The N and C termini of flagellin and alpha-helices flanking the termini form the inner core of the filament cylinder (Bergman). The central portion, or “dispensable region,” forms the outer surface of the filament, and is highly variable.

iGEM Team Slovenia 2008 used the FliC gene to design a chimeric fusion protein expressing the antigenic segment of H. pylori on E. coli flagella (BBa_K133038). Our team wanted to use the same flagellar expression mechanism to express metal binding sequences, and our part is an improvement on the Slovenian biobrick. In the process, we designed the FliC gene with a multiple cloning site (MCS) in the dispensable region so that any iGEM team can insert a protein to be expressed in the dispensable region.


Engineered MCS FliC:

FliC construct.001.jpg


Biobricks used: Promoter J23100, RBS B0030, Terminator B0015


We inserted the following metal-binding sequences into the FliC disposable region. Nucleotide sequences were obtained by reverse translating peptide sequences with codons optimized for E. coli.

Metal Ion-Binding Peptides
Peptide Name Binds to Sequences
HTTC Cu 2+ Peptide: HNLGMNHDLQGERPYVTEGC Nucleotide: CATAACCTGGGCATGAACCATGATCTGCAGGGCGAACGCCCGTATGTGACCGAAGGCTGC

"HTTC" (binds Cu 2+ ions)

peptide sequence: HNLGMNHDLQGERPYVTEGC nucleotide sequence: CATAACCTGGGCATGAACCATGATCTGCAGGGCGAACGCCCGTATGTGACCGAAGGCTGC

"HypB1" (binds Cu 1+ ions)

CTTCGCG nucleotide sequence: TGCACCACCTGCGGCTGCGGC

"HypB2" (binds Cu 1+ ions)

MCTTCGCGEG nucleotide sequence: ATGTGCACCACCTGCGGCTGCGGCGAAGGC

Undergoing metal-binding assays now and flagella imaging on SEM.


CITATIONS

Molly A. Bergman,Lisa A. Cummings,Robert C. Alaniz,Laura Mayeda,Ivana Fellnerova,Brad T. Cookson. CD4+-T-Cell Responses Generated during Murine Salmonella enterica Serovar Typhimurium Infection Are Directed towards Multiple Epitopes within the Natural Antigen FliC. 2005 Infect Immun. 73(11): 7226–7235

E.Coli FliC gene: http://biocyc.org/ECOLI/sequence-rc?type=GENE&object=EG10321

Kouichi Kuroda and Mitsuyoshi Ueda. Molecular design of the microbial cell surface toward the recovery of metal ions. Current Opinion in Biotechnology 2011, 22:427–433

Benita Westerlund-Wikstro ̈m, Jarna Tanskanen, Ritva Virkola, Jo ̈rg Hacker, Martin Lindberg, Mikael Skurnik and Timo K.Korhonen. Functional expression of adhesive peptides on flagellin (Section - Purification of Chimeric Flagella) Protein Engineering vol.10 no.11 pp.1319-1326, 1997

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