Difference between revisions of "Part:BBa K4221016"

Latest revision as of 06:44, 11 October 2022

mOrange-TEVlinker-BslA(42-181aa)

Sequence and Features

Assembly Compatibility:

10
INCOMPATIBLE WITH RFC[10]
Illegal EcoRI site found at 43
Illegal SpeI site found at 619
12
INCOMPATIBLE WITH RFC[12]
Illegal EcoRI site found at 43
Illegal SpeI site found at 619
21
INCOMPATIBLE WITH RFC[21]
Illegal EcoRI site found at 43
23
INCOMPATIBLE WITH RFC[23]
Illegal EcoRI site found at 43
Illegal SpeI site found at 619
25
INCOMPATIBLE WITH RFC[25]
Illegal EcoRI site found at 43
Illegal SpeI site found at 619
1000
COMPATIBLE WITH RFC[1000]

Usage

Aqueous two-phase separation (ATPS) is a liquid-liquid fractionation technique effectively used for protein separation and purification[1]. When a protein fuses with a hydrophobin, the hydrophobin changes the hydrophobicity of the protein, which causes the protein to aggregate into the surfactants.

Our team is trying to improve traditional ATPS by incorporating a continuous-flow system and replacing fungal hydrophobins with BslA. Using mOrange[2] as target protein can visually observe fluorescent protein (mHoneydew,target protein) showing orange fluorescence in the process of protein expression and two-phase extraction, so as to determine the separation and purification effect.

In the process of protein purification by ATPs, we can use the amphiphilicity of BslA to change the hydrophilicity of fluorescent protein, so that fluorescent protein can only show fluorescence in the organic phase/aqueous phase, so as to achieve a high-efficiency and low-cost protein purification method.

Biology

Conventional Orange FPs are mainly derived from two parental proteins: Kusabira-Orange (KO) and DsRed. KO was originally isolated from stony coral Fungiaconcinna, which provides bright orange fluorescence to proteins by introducing 10 amino acid residues at its N terminus. Shaner et al. improved mHoneydew and mOrange on the basis of mRFP1, a single molecule variant of DsRed.[3]

BslA is a structurally defined bacterial hydrophobin that was found in the biofilm of Bacillus subtilis. It helps the assembling of TasA (an exopolysaccharide and an amyloid fiber-forming protein), the component of the biofilm matrix. BslA is composed of an Ig-type fold with the addition of an unusual, extremely hydrophobic “cap” region. The central hydrophobic residues of the cap are essential to allow a hydrophobic, nonwetting biofilm to form as they control the surface activity of the BslA protein.[4]

Design Consideration

The construct was cloned into a PET28a plasmid and transformed into BL21 (DE3) E. coli.

The construction includes:

mOrange is fused with BslA with a TEVlinker（GAAAACCTGTACTTCCAGGGTTCTGGT）

Reference

[1] E Mustalahti, M Saloheimo, J J. JoensuuIntracellular protein production in Trichodermareesei (Hypocreajecorina) with hydrophobin fusion technology[J]. New Biotechnology, 2013(30)

[2]Aijia J, Xibin N. Construction and Expression of Prokaryotic Expression Vector pET28a-EGFP[J]. JOURNAL OF MICROBIOLOGY, 2011, 31(4):69-73.

[3]Peng W, He P, Shi D, etal. Advances in the research and applications of orange fluorescent protein[J]. Journal of Biotechnology, 2020, 36(6):1060−1068.

[4]: “BslA is a self-assembling bacterial hydrophobin that coats the Bacillus subtilis biofilm.” Proceedings of the National Academy of Sciences of the United States of America vol. 110,33 (2013): 13600-5. doi:10.1073/pnas.1306390110

@@ Line 28: / Line 28: @@
 ===Design Consideration===
-The construct was cloned into a PET28a plasmid and transformed into mOrange-PET28a [2]
+The construct was cloned into a PET28a plasmid and transformed into BL21 (DE3) E. coli.
 The construction includes:
 mOrange is fused with BslA with a TEVlinker（GAAAACCTGTACTTCCAGGGTTCTGGT）
-===Protein Expression===
-[[File:figure-6 a .png|500px]]<br>
-'''Figure 1.'''
-(a) SDS-PAGE of pET28a-mOrange-GSlinker-BsIA transformed into BL21 expressing strains. Induction time: 12h
-M: GoldBand Plus 3-color Regular Range Protein Marker(8-180 kDa), 1,3,5,7,9,11: Before induction 2,4,6,8,10,12: After induction; 2: 37℃ 0.1mM IPTG,4: 16℃ 0.1mM IPTG,6: 37℃ 0.3mM IPTG,8: 16℃ 0.3mM IPTG,10: 37℃ 0.5mM IPTG,12: 16℃ 0.5mM IPTG
-[[File:figure-6 b .png|500px]]<br>
-'''Figure 1.'''
-(b) 1: 37℃ Before induction 2-4: After induction; 2: 37℃ 0.1mM IPTG, 3: 37℃ 0.3mM IPTG, 4: 37℃ 0.5mM IPTG, 5-7: 16℃ Before induction 8-10: After induction; 8: 16℃ 0.1mM IPTG, 9: 16℃ 0.3mM IPTG, 10: 16℃ 0.5mM IPTG,
-[[File:figure-7 a .png|500px]]<br>
-'''Figure 2.'''
-(a) SDS-PAGE of pET28a-mOrange-GSlinker-BsIA transformed into Rosetta expressing strains. Induction time: 12h
-M: GoldBand Plus 3-color Regular Range Protein Marker(8-180 kDa), 1,3,5,7,9,11: Before induction 2,4,6,8,10,12: After induction; 2: 37℃ 0.1mM IPTG,4: 16℃ 0.1mM IPTG,6: 37℃ 0.3mM IPTG,8: 16℃ 0.3mM IPTG,10: 37℃ 0.5mM IPTG,12: 16℃ 0.5mM IPTG
-[[File:figure-7 b .png|500px]]<br>
-'''Figure 2.'''
-(b) 1: 37℃ Before induction 2-4: After induction; 2: 37℃ 0.1mM IPTG, 3: 37℃ 0.3mM IPTG, 4: 37℃ 0.5mM IPTG, 5-7: 16℃ Before induction 8-10: After induction; 8: 16℃ 0.1mM IPTG, 9: 16℃ 0.3mM IPTG, 10: 16℃ 0.5mM IPTG,
-===Detection of fusion protein function===
-After the cells of the recombinant strains were induced, centrifuged, and sonicated, the soluble proteins expressed by the strains were all in the supernatant, We used a comparative experiment to add different droplets to the hydrophobic material and observe the water contact Angle.
-[[File:figure-8 .png|500px]]<br>
-'''Figure 3.'''Water contact angle.
-===Aqueous two-phase separation (ATPS) Testing===
-We used 1×PBS as a blank control, we added isobutanol to the protein supernatant, shaken and let stand for a few minutes until the two phases were clearly separated.
-[[File:figure-9 b .png|500px]]<br>
-'''Figure 4.''' ATPS testing.
 ===Reference===