Part:BBa_K4365008

Signal peptide of HYPI from Aspergillus fumigatus

HYPI is a protein found in Aspergillus fumigatus and belongs to a family of highly secreted proteins called hydrophobins. The signal peptide from the protein led to no turboRFPJosé Juan Almagro Armenteros et al. (2019) SignalP 5.0 improves signal peptide predictions using deep neural networks Nature Biotechnology, 37, 420-423, doi: 10.1038/s41587-019-0036-z ! turboRFP secretion |- style="text-align:center;" |sp1 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365006 BBa_K4365006] || MPGI || Magnaporthe grisea || 0.9562 || '''Yes''' |- style="text-align:center;" |sp2 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365007 BBa_K4365007] || RodA || Aspergillus nidulans || 0.9553 || '''Yes''' |- style="text-align:center;" |sp3 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365008 BBa_K4365008] || HYPI || Aspergillus fumigatus || 0.9703 || No |- style="text-align:center;" |sp4 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365009 BBa_K4365009] || SsgA || Metarhizium anisopliae || 0.9126 || No |- style="text-align:center;" |sp5 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365010 BBa_K4365010] || HCF-4 || Cladosporium fulvum || 0.9126 || '''Yes''' |- style="text-align:center;" |sp6 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365025 BBa_K4365025] || HCF-5 || Cladosporium fulvum || 0.9234 || NA |- style="text-align:center;" |sp7 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365026 BBa_K4365026] || CCG-2 || Neurospora crassa || 0.9566 || NA |- style="text-align:center;" |sp8 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365011 BBa_K4365011] || HCF-1 || Cladosporium fulvum || 0.6850 || '''Yes''' |- style="text-align:center;" |sp9 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365027 BBa_K4365027] || HCF-2 || Cladosporium fulvum || 0.8144 || NA |- style="text-align:center;" |sp10 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365012 BBa_K4365012] || HCF-3 || Cladosporium fulvum || 0.7934 || No |- style="text-align:center;" |sp11 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365013 BBa_K4365013] || SC3 || Schizophyllum commune || 0.6327 || No |- style="text-align:center;" |sp12 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365014 BBa_K4365014] || ABH3 || Agaricus bisporus || 0.9458 || '''Yes''' |- style="text-align:center;" |sp13 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365028 BBa_K4365028] || COH1 || Coprinus cinereus || 0.8545 || NA |- style="text-align:center;" |sp14 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365015 BBa_K4365015] || FBH1 || Pleurotus ostreatus || 0.3367 || '''Yes''' |- style="text-align:center;" |sp15 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365016 BBa_K4365016] || Aa-PRI2 || Agrocybe aegerita || 0.6356 || '''Yes''' |- style="text-align:center;" |sp16 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365033 BBa_K4365033] || Hyd-Pt1 || Pisolithus tinctorius || 0.8352 || NA |- style="text-align:center;" |sp17 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365017 BBa_K4365017] || HFBI || Trichoderma reesei || 0.9851 || '''Yes''' |- style="text-align:center;" |sp18 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365018 BBa_K4365018] || HFBII || Trichoderma reesei || 0.6862 || '''Yes''' |- style="text-align:center;" |sp19 || [https://parts.igem.org/wiki/index.php?title=Part:BBa_K4365019 BBa_K4365019] || α-mating factor || Saccharomyces cerevisiae || 0.9988 || '''Yes''' |}
Sequence and Features BBa_K4365008 SequenceAndFeatures ===Usage and Biology=== Secretion signal peptides can be fused to a protein to direct it through the secretory pathway out of the cell Alberts, B. (2015) Molecular Biology of the Cell. 6th Edition, Garland Science, Taylor and Francis Group, New York.. Such secretion of recombinant proteins facilitates the protein purification process and the removal of GMOs Kirsten Kottmeier, Kai Ostermann, Thomas Bley, Gerhard Rödel (2011) Hydrophobin signal sequence mediates efficient secretion of recombinant proteins in Pichia pastoris, Appl Microbiol Biotechnol 91, pages133–141, https://doi.org/10.1007/s00253-011-3246-y. However, commonly used signal sequences like the ''S. cerevisiae'' alpha-factor prepro-peptide K4365019 and the HSP150, are very long ^[1]^[2] which makes their use in genetic constructs limited. K4365008 as a part of the collection of signal peptides represents a shorter sequence that could be inserted into the gene of interest simply by PCR and could display higher secretion efficiency.

The sequences of the hydrophobic signal peptide was collected from literature ^[3] and was extracted via analysis of their sequence using the SignalP - 5.0 signal peptide predictor tool ^[4].

Identified sequence was codon-optimized for S. cerevisiae using the codon optimization tool on GenScript. Then it was synthesized by IDT as a gBlock together with a flexible glycine linker (K4365005) and the turboRFP gene (K4365020) ^[5].

Hydrophobins

Hydrophobins are a group of small (~100 amino acids) proteins that are expressed in ascomycetes and basidiomycetes, which are very efficiently secreted ^[1].

After secretion from the fungus, they can assemble on the cell walls to form a hydrophobic coating. For this reason, the functions of hydrophobins are related to cell surface activity. For example, they can cover hyphae so the surface tension can be lowered and the hyphae can breach the water/air interface, thus escaping from the aqueous environment and growing into the aerial hyphae ^[6]. They also mediate the adhesion of the hyphae to hydrophobic surfaces such as in the case of pathogen-host interaction or symbiosis, as observed in lichens and in ectomycorrhizae (the symbiotic relationship between a fungal symbiont and the roots of a plant) ^[6]. Hydrophobins also form a hydrophobic sheath to protect the surface of conidia, spores, and caps of fungi against wetting and desiccation ^[6].

Signal peptide secretion screening

Signal peptide siquence was cloned together with turboRFP K4365020 into the level 1 shuttle plasmid K4365022 (Figure 1).

Figure 1: fusion protein used for the secretion assays composed of a signal peptide, a flexible linker, and the turboRFP fluorescent protein. Created with Biorender.com.

After the transformation with the shuttle plasmid, the yeast colonies were grown on W0 medium plates supplemented with histidine, leucine, and methionine and were used for secretion assays in flasks and in a 48-well plate. The α-mating factor pre-pro signal peptide K4365019 was used as a positive control as it has been shown to be able to secrete proteins ^[7]. A turboRFP without signal peptide was employed as a negative control to account for the amount of free turboRFP present in the media due to cell lysis.

Secretion measurement protocols:

The first secretion experiment was conducted in flasks and showed (Figure 2A) that cell lysis was low as indicated by the low fluorescence of the negative control. In order to have consistent results and ensure confidence we set up biological triplicates. For this, turboRFP secretion was measured using 48-well plate approach. Cells with induced expression were pipetted into the wells of the plate and grown overnight. Starting at 1 hour after induction, samples were taken and the growth rate was monitored by measuring turbidity (NTU) and the development of fluorescence in the supernatant was measured on a plate reader.

Despite the fact that K4365008 exhibited increased turboRFP secretion when measured using flasks a more sensitive approach showed that signal from K4365008 was on the level of cell lysis (Figure 2). Thus, this indicates that combination of K4365008 with turboRFP is not optimal for turboRFP secretion in S. cerevisiae.

Figure 2: A secretion by signal peptides in flasks. B secretion assay in 48-well plate with an initial cell density of 1 OD. The canonical α-mating factor pre-pro signal peptide ^[7] (dark grey + control) was used as a positive control as it has been shown to be able to secrete proteins. A turboRFP without signal peptide was employed as a negative control to account for cell lysis (light grey, - control). The signal corresponding to K4365008 is depicted as a dashed line. Error bars represent mean ± SD.

References

↑ Cite error: Invalid <ref> tag; no text was provided for refs named 1kirsten
↑ Russo P, Kalkkinen N, Sareneva H, Paakkola J, Makarow M. A heat shock gene from Saccharomyces cerevisiae encoding a secretory glycoprotein. Proc Natl Acad Sci U S A. 1992 May 1;89(9):3671-5. doi: 10.1073/pnas.89.9.3671. Erratum in: Proc Natl Acad Sci U S A. 1992 Sep 15;89(18):8857. PMID: 1570286; PMCID: PMC525552.
↑ M. Parta, Y. Chang et al. (1994) HYPI, a Hydrophobin Gene from Aspergllus fumigatus, Complements the rodletless Phenotype in Aspergillus nidulans, Infection and Immunity Vol.62, No.10 doi: 10.1128/iai.62.10.4389-4395.1994
↑ José Juan Almagro Armenteros et al. (2019) SignalP 5.0 improves signal peptide predictions using deep neural networks Nature Biotechnology, 37, 420-423, doi: 10.1038/s41587-019-0036-z
↑ Merzlyak, E., Goedhart, J., Shcherbo, D. et al. (2007) Bright monomeric red fluorescent protein with an extended fluorescence lifetime. Nat Methods 4, 555–557 (2007). https://doi.org/10.1038/nmeth1062
↑ ^6.0 ^6.1 ^6.2 Khalesi, M., Gebruers, K. & Derdelinckx, G. (2015) Recent Advances in Fungal Hydrophobin Towards Using in Industry, Protein J, 34, 243–255 . https://doi.org/10.1007/s10930-015-9621-2
↑ ^7.0 ^7.1 Peñas M. M. et al. (1998) Identification, characterization, and In situ detection of a fruit-body-specific hydrophobin of Pleurotus ostreatus, Appl Environ Microbiol. 64(10):4028-34. doi: 10.1128/AEM.64.10.4028-4034.1998. PMID: 9758836; PMCID: PMC106595.

[1kirsten] Cite error: Invalid <ref> tag; no text was provided for refs named 1kirsten

[2] Russo P, Kalkkinen N, Sareneva H, Paakkola J, Makarow M. A heat shock gene from Saccharomyces cerevisiae encoding a secretory glycoprotein. Proc Natl Acad Sci U S A. 1992 May 1;89(9):3671-5. doi: 10.1073/pnas.89.9.3671. Erratum in: Proc Natl Acad Sci U S A. 1992 Sep 15;89(18):8857. PMID: 1570286; PMCID: PMC525552.

[3] M. Parta, Y. Chang et al. (1994) HYPI, a Hydrophobin Gene from Aspergllus fumigatus, Complements the rodletless Phenotype in Aspergillus nidulans, Infection and Immunity Vol.62, No.10 doi: 10.1128/iai.62.10.4389-4395.1994

[4] José Juan Almagro Armenteros et al. (2019) SignalP 5.0 improves signal peptide predictions using deep neural networks Nature Biotechnology, 37, 420-423, doi: 10.1038/s41587-019-0036-z

[5] Merzlyak, E., Goedhart, J., Shcherbo, D. et al. (2007) Bright monomeric red fluorescent protein with an extended fluorescence lifetime. Nat Methods 4, 555–557 (2007). https://doi.org/10.1038/nmeth1062

[5khal-6] 6.0 ^6.1 ^6.2 Khalesi, M., Gebruers, K. & Derdelinckx, G. (2015) Recent Advances in Fungal Hydrophobin Towards Using in Industry, Protein J, 34, 243–255 . https://doi.org/10.1007/s10930-015-9621-2

[19penas-7] 7.0 ^7.1 Peñas M. M. et al. (1998) Identification, characterization, and In situ detection of a fruit-body-specific hydrophobin of Pleurotus ostreatus, Appl Environ Microbiol. 64(10):4028-34. doi: 10.1128/AEM.64.10.4028-4034.1998. PMID: 9758836; PMCID: PMC106595.

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