Part:BBa_K3190109
Xenopus laevis lutropin-choriogonadotropic hormone receptor LHCGR CDS with Linker-superfolder GF
Mammalian Luteinizing Hormones (LH) share structural similarity, functional equivalency, and bind the same receptor as Human chorionic gonadotropin (hCG); this suggests that Xenopus laevis lutropin-choriogonadotropic hormone receptor (XLLHCGR) may serve as a good alternative to Homo sapiens LHCGR for the detection of LH, as LH has been found to induce maturation of Xenopus oocytes in vitro (Wlizla et al., 2017). For this biobrick (XLLHCGR-Li-sfGFP), the C-terminal end of XLHCGR was fused with superfolder GFP (BBa_K3190205) using a linker (BBa_K3190206).
Usage and Biology
In our studies, XLHCGR-Li-sfGFP was used to examine expression and localization of XLHCGR (BBa_K3190107) in S. cerevisiae.
Chromosomal integration
XLHCGR-Li-sfGFP was integrated into the yeast chromosome, and correct insertion was verified using colony PCR.
Figure 1: Colony PCR of yeast transformed with XLHCGR-Li-sfGFP | Specific yeast genotyping primers were used for the PCR reaction. PCR products were separated by electrophoresis on 1% agarose gel. The sizes of the molecular weight standards are shown on the left. Lanes 1-8 correspond to individual colonies. Expected band sizes are of 1000 bp, indicating successful chromosomal integration. Band sizes of 1500 bp indicate unsuccessful chromosomal integration.
Expression of XLHCGR
Expression of the XLHCGR-Li-sfGFP was confirmed by performing western blot, using anti GFP antibody. The results are depicted below:
[INSERT WB IMAGE HERE]
Figure 2: Western blot of insoluble vs soluble cellular protein | Western blot was carried out using anti-GFP antibodies. Yeast expressing empty vectors and GFP was used as negative and positive control respectively. Two replicate yeast cultures were used for the western blot.
As expected, XLHCGR-sfGFP was predominantly found in the insoluble fraction, suggesting possible membrane localization. The existence of a small band in the soluble fraction indicates that the protein was very abundant in the respective cells. Similarly, the presence of GFP in the insoluble fraction can be attributed to very high expression levels.
Microscopy
To further verify expression of XLHCGR-Li-sfGFP, and examine intracellular localization of the receptor, confocal microscopy was performed.
Figure 3: Confocal microscopy of transformed yeast cells | A) Bright field empty vector. B) Fluorescence filter empty vector. C) Bright field XLHCGR-Li-sfGFP. D) Fluorescence filter XLHCGR-Li-sfGFP.
As expected, a clear fluorescent signal was seen in yeast expressing XLHCGR-Li-sfGFP (Fig. 3C and D) confirming expression of XLHCGR-Li-sfGFP. However, localization of the fluorescent signal (Fig. 3D) was not sufficient to conclude on the specific location of XLHCGR within the cell.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 428
Illegal BglII site found at 1682 - 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 2179
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