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2015 ; 10
(9
): e0136778
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English Wikipedia
A Robust and Versatile Method of Combinatorial Chemical Synthesis of Gene
Libraries via Hierarchical Assembly of Partially Randomized Modules
#MMPMID26355961
Popova B
; Schubert S
; Bulla I
; Buchwald D
; Kramer W
PLoS One
2015[]; 10
(9
): e0136778
PMID26355961
show ga
A major challenge in gene library generation is to guarantee a large functional
size and diversity that significantly increases the chances of selecting
different functional protein variants. The use of trinucleotides mixtures for
controlled randomization results in superior library diversity and offers the
ability to specify the type and distribution of the amino acids at each position.
Here we describe the generation of a high diversity gene library using tHisF of
the hyperthermophile Thermotoga maritima as a scaffold. Combining various
rational criteria with contingency, we targeted 26 selected codons of the thisF
gene sequence for randomization at a controlled level. We have developed a novel
method of creating full-length gene libraries by combinatorial assembly of
smaller sub-libraries. Full-length libraries of high diversity can easily be
assembled on demand from smaller and much less diverse sub-libraries, which
circumvent the notoriously troublesome long-term archivation and repeated
proliferation of high diversity ensembles of phages or plasmids. We developed a
generally applicable software tool for sequence analysis of mutated gene
sequences that provides efficient assistance for analysis of library diversity.
Finally, practical utility of the library was demonstrated in principle by
assessment of the conformational stability of library members and isolating
protein variants with HisF activity from it. Our approach integrates a number of
features of nucleic acids synthetic chemistry, biochemistry and molecular
genetics to a coherent, flexible and robust method of combinatorial gene
synthesis.