Part:BBa_J61000

chloramphenicol resistance cassette

Chloramphenicol resistance gene including its native promoter and ribosome binding site. Confers resistance to 25 ug/mL chloramphenicol.

ApE file:{pSB1A2-Bca1016}

This part belongs to a family useful for the construction of transposons and knockin cassettes.

FRT The FRT sequence is the recombination substrate for Flp recombinase. Like the Cre/Lox system, sequences flanked by FRT sites oriented in the same direction get excised by expression of Flp. Cassettes flanked by FRT allow the introduction of selectable markers into the genome followed by subsequent removal by the recombinase.

Tn5 The two Tn5 elements are the substrates for the Tnp transposase in both orientations. Sequences flanked by the two Tn5 elements (in opposing orientation) are mobilizable elements. In the presence of Tnp, they are excised from their plasmid and introduced randomly into the genome or plasmids present in the cell.

Tnp The gene for a high-activity mutant of Tn5 transposase.

OriTr Special strains of E. coli with remnants of the RP4 plasmid, including Rlambda (part ) and BW20767, can transfer plasmids with oriTr (part J01003) to diverse species of bacteria.

OriTf Special strains of E. coli with remanants of the F plasmid, such as J23055, can transfer plasmids with oriTf (part J01002) to other E. coli.

R6K A conditional origin of transfer requiring the pir gene expressed in trans.

Construction of Transposon Plasmids
Transposition mutagenesis is usually carried out by mating a donor strain containing a transposon on a plasmid into a recipient strain. The plasmid with the transposon and transposase transfers to the recipient strain, the transposon is excised from the plasmid, and inserts randomly into the genome. A selectable marker in the transposon and in the recipient strain allows selection of cells receiving the transposon over both the donor and recipient strain.

Construction of the transposon donor strain requires a conjugative donor strain harboring a plasmid with the following elements:

A conjugative origin of transfer

A conditional origin of replication, usually R6K, so that the plasmids cannot replicate within the recipient strain (so no second origin of replication)

A transposon containing a selectable marker flanked by Tn5 ends

The transposase gene

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
COMPATIBLE WITH RFC[12]
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
COMPATIBLE WITH RFC[25]
1000
COMPATIBLE WITH RFC[1000]

Functional Parameters

o_h	-NA-
protein	chloramphenicol acetyl transferase
rbs	-NA-
tag	-NA-

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 part exhibited a significant burden. Users should be aware that BioBricks with a burden of >20-30% may be susceptible to mutating to become less functional or nonfunctional as an evolutionary consequence of this fitness cost. This risk increases as they used for more bacterial cell divisions or in larger cultures. Users should be especially careful when combining multiple burdensome parts, as plasmids with a total burden of >40% are expected to mutate so quickly that they become unclonable. Refer to any one of the BBa_K3174002 - BBa_K3174007 pages for more information on the methods 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.