Title:In Silico Investigation of Signal Peptide Sequences to Enhance Secretion of CD44 Nanobodies Expressed in Escherichia coli
Volume: 22
Issue: 9
Author(s): Soudabeh Kavousipour, Shiva Mohammadi, Ebrahim Eftekhar, Mahdi Barazesh*Mohammad H. Morowvat
Affiliation:
- School of Paramedical, Gerash University of Medical Sciences, Gerash,Iran
Keywords:
CD44, E. coli, in silico cloning, physicochemical properties, secretory production, SignalP software.
Abstract:
Background: The selection of a suitable signal peptide that can direct recombinant proteins
from the cytoplasm to the extracellular space is an important criterion affecting the production of recombinant
proteins in Escherichia coli, a widely used host. Nanobodies are currently attracting the attention
of scientists as antibody alternatives due to their specific properties and feasibility of production
in E. coli.
Objective: CD44 nanobodies constitute a potent therapeutic agent that can block CD44/HA interaction
in cancer and inflammatory diseases. This molecule may also function as a drug against cancer cells
and has been produced previously in E. coli without a signal peptide sequence. The goal of this project
was to find a suitable signal peptide to direct CD44 nanobody extracellular secretion in E. coli that will
potentially lead to optimization of experimental methods and facilitate downstream steps such as purification.
Methods: We analyzed 40 E. coli derived signal peptides retrieved from the Signal Peptide database
and selected the best candidate signal peptides according to relevant criteria including signal peptide
probability, stability, and physicochemical features, which were evaluated using signalP software version
4.1 and the ProtParam tool, respectively.
Results: In this in silico study, suitable candidate signal peptide(s) for CD44 nanobody secretory expression
were identified. CSGA, TRBC, YTFQ, NIKA, and DGAL were selected as appropriate signal
peptides with acceptable D-scores, and appropriate physicochemical and structural properties. Following
further analysis, TRBC was selected as the best signal peptide to direct CD44 nanobody expression
to the extracellular space of E. coli.
Conclusion: The selected signal peptide, TRBC is the most suitable to promote high-level secretory
production of CD44 nanobodies in E. coli and potentially will be useful for scaling up CD44 nanobody
production in experimental research as well as in other CD44 nanobody applications. However, experimental
work is needed to confirm the data.