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These scaffolds can be used for the generation of libraries of mutants from which high-affinity binders can be selected.
This strategy merges evolutionary tinkering with rational engineering - nature generates a library of mutants, from which man selects the ones that work and can provide us with desired substances.
We compared the viability of wild-type E. coli MC4100relA+ to the viability of mutants from which each of the five TA gene pairs had been deleted individually.
Then, we performed transposon mutagenesis and obtained ca. 16,500 kanamycin resistant mutants from which we selected 23 that displayed a stable R phenotype both in vitro and in mice, as judged by the crystal violet test, lack of reactivity with anti O-PS antibodies and phage typing.
Interestingly, H2A mutants from which serines 10 and 15 were removed displayed larger nuclear volumes.
In this technique, the introduction of random mutations into the nucleotide sequences results in a pool of mutants from which proteins with improved function can be selected.
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This strain was obtained by evolving a mutant from which araC has been deleted, and in which genes required for pentose metabolism are constitutively expressed.
It was confirmed that the desired fusion protein (OmpA::FLAG) was expressed and destined to the outer membrane (OM) of the E. coli mutant from which the OMVs carrying OmpA::FLAG are released during growth.
A crystal of the HEPD-Y98F mutant, from which the His6 tag had been removed with thrombin, was obtained as previously reported for wild-type HEPD.
In all three cases, the single site mutation completely recapitulated the fluorescence phenotype of the EMS-mutant from which it was identified.
We further generated a SOCS6 mutant, from which the SOCS box was deleted (SOCS6-ΔSB), and showed that SOCS6-ΔSB failed to target to mitochondria or induce mitochondrial fragmentation.
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