The difficulty is
compounded by the fact that many components are involved in
the secretion process, and that successful secretion requires
favorable interaction of a target protein with multiple system
components and various host factors. Additionally, the vast
number of possible structures for a protein over a wide range
of applications, from therapeutics to biofuel production, limits
the development of a one-size-fits-all type of generalized
secretion method. All these difficulties contributed to the fact
that success in the past had to rely heavily on trial and error,
which is laborious, resource-consuming, and time-consuming.
Signal peptide could be considered as only one small part of
secretion machinery. Yet, as it is clear from this review, our
incomplete understanding about the interplay of at least three
factors in the secretion process (signal peptide, the target
protein, and the secretion system) renders any rational based
selection or modification signal peptide, almost a futile effort.
This accentuates the difficulty in secretion engineering when
additional membrane barrier is present as in the case of gramnegative
bacteria. Continued research and advance in the field
of protein secretion will make the engineering efforts more
predictable and more rational based
The difficulty iscompounded by the fact that many components are involved inthe secretion process, and that successful secretion requiresfavorable interaction of a target protein with multiple systemcomponents and various host factors. Additionally, the vastnumber of possible structures for a protein over a wide rangeof applications, from therapeutics to biofuel production, limitsthe development of a one-size-fits-all type of generalizedsecretion method. All these difficulties contributed to the factthat success in the past had to rely heavily on trial and error,which is laborious, resource-consuming, and time-consuming.Signal peptide could be considered as only one small part ofsecretion machinery. Yet, as it is clear from this review, ourincomplete understanding about the interplay of at least threefactors in the secretion process (signal peptide, the targetprotein, and the secretion system) renders any rational basedselection or modification signal peptide, almost a futile effort.This accentuates the difficulty in secretion engineering whenadditional membrane barrier is present as in the case of gramnegativebacteria. Continued research and advance in the fieldof protein secretion will make the engineering efforts morepredictable and more rational based
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