EnCor Biotechnology

Mouse Monoclonal Antibody to Green Fluorescent Protein (GFP) Cat# MCA-6H12

$250.00
Description

      The MCA-6H12 antibody was made against a recombinant GFP construct originating from an Aequoria species which was engineered to improve spectral properties and prevent oligomerization (10). This form of GFP, referred to as AcGFP, is 94% identical to the eGFP developed by Tsien and coworkers and is the form of GFP inserted in the Clontech/Takara pAcGFP and related expression vectors. The antibody is strongly inhibited from binding to AcGFP by the peptide YLLPDNHYLSTQSALSKDNP and to a much lesser degree by the peptide SKDNPEKRDHMIYFGFVTAA. This suggests that the major determinant of antibody binding is the SKDNP and sequence N-terminal to this peptide. This region is amino acids 209-213 of GFP and corresponds to a turn between two β-strands of the β barrel GFP structure. This region is conserved in GFP variants and distinct from the homologous sequence seen in other fluorescent proteins, see see here. We also supply the immunogen for this and our other GFP antibodies, PROT-AcGFP. The antibody can be used to verify the expression, size and stability of both AcGFP and eGFP fusion proteins in western blotting experiments and to amplify GFP signals for ICC and IHC of transgenic animals. We also supply rabbit, chicken and goat polyclonal antibodies to this protein, RPCA-GFP, CPCA-GFP and GPCA-GFP.

 Collections:
Volume: 100µL of 1mg/mL
Volume: 100µL of 1mg/mL
Immunofluorescent analysis of transfected HEK293 cells with a GFP-construct showing endogenous fluorescence in green and stained with mouse mAb to GFP, MCA-6H12, dilution 1:1,000 in red. The blue is Hoechst staining of nuclear DNA. Top left shows endogenous fluoescence. top right shows antibody staining in transfected cells. Bottom image shows both channels, cells appear yellowish due to superimposition of two signals. The surrounding untransfected cells are controls showing only nuclear DNA staining, expressing no GFP and being unreactive with the antibody.
Western blot analysis of HEK293 cell lysates using mouse mAb to GFP, MCA-6H12, dilution 1:2,000, in green: Lane [1] protein molecular weight standard, [2] HEK293 control extract from untransfected cells, [3] HEK293 cells transfected with pCI-Neo-mod vector expressing acGFP. [4] with pCI-Neo-mod vector expressing mCherry protein, and [5] HEK293 cells transfected with pCI-Neo-mod vector expressing tdTomato protein. MCA-6H12 only recognizes acGFP and does not recognize mCherry ot tdTomato.

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Name: GFP, mouse monoclonal, Cat# MCA-6H12
Immunogen: The prot-r-AcGFP recombinant protein purified from E. coli. The epitope is dependent on amino acids 209-213 of eGFP, a region conserved in several GFP isoferms and the Clontech and other GFP vectors
HGNC Name: N.A.
UniProt: Q6YGZ0
Molecular Weight: ~27kDa
Host: Mouse
Isotype: IgG1 κ
Species Cross-Reactivity: AcGFP, eGFP, not mCherry
RRID: AB_2572316
Format: Purified antibody at 1mg/mL in 50% PBS, 50% glycerol plus 5mM NaN3
Applications: WB, IF/ICC, IHC
Recommended Dilutions: WB: 1:1,000-5,000. IF/IC: 1:1,000-5,000. IHC: 1-5,000-1:10,000.
Storage: Stable at 4°C for one year, for longer term store at -20°C

      The green fluorescent protein (GFP) is a 27kDa protein isolated originally from the jellyfish Aequoria victoria. It has an endogenous fluorochrome activity with excitation maximum at 395nm and emission maximum at 509nm, which is similar to that of fluorescein (1,2). The GFP gene was sequenced and the origin of the fluorochrome by autocatalytic activity of certain amino acids was discovered (3,4). Much interest in GFP was generated when it was shown that fluorescence develops rapidly when the protein is expressed and requires only molecular oxygen and no other cofactors. As a result GFP can be expressed in fluorescent form in essentially any prokaryotic or eukaryotic cell (5). GFP has been engineered to produce a vast number of variously colored mutants including blue, cyan and yellow protein derivatives, BFP, CFP and YFP (6-9). GFP and other fluorescent proteins derived from other Cnidarians (jellyfish, coral and medusa) are widely used as tracers in transfection and transgenic experiments to monitor gene expression and protein localization in vivo and in in vitro. The crystal structure of GFP was determined (7) which allowed amino acid modifications to improve spectral properties and prevent multimerization (8,9). The discovery GFP was the basis of the 2008 Nobel prize in chemistry, specifically “for the discovery and development of the green fluorescent protein, GFP”.

      The MCA-6H12antibody was made against a recombinant GFP construct originating from an Aequoria species which was engineered to improve spectral properties and prevent oligomerization (10). This form of GFP, referred to as AcGFP, is 94% identical to the eGFP developed by Tsien and coworkers and is the form of GFP inserted in the Clontech/Takara pAcGFP and related expression vectors. We also supply the immunogen, PROT-AcGFP. The antibody can be used to verify the expression, size and stability of both AcGFP and eGFP fusion proteins in western blotting experiments and to amplify GFP signals in tissues of transgenic animals. We also supply another mouse monoclonal antibody and rabbit, chicken, goat polyclonal antibodies to this protein, MCA-3B11, RPCA-GFP, CPCA-GFP and GPCA-GFP.



Chromogenic Immunostaining of a 4% PFA fixed paraffin embedded mouse brain section with mouse mAb to GFP, MCA-6H12, dilution 1:5,000, detected with DAB chromogen (brown) using the Vector Labs ImmPRESS method and reagents with citrate buffer retrieval. The GFP was expressed using a lentiviral expression vector. Hematoxylin (blue) was used as the counterstain. MCA-6H12 specifically detected GFP positive cells in the cerebellum as expected for this model. Mouse select image for larger view.

We used AcGFP used as immunogen for this antibody. The core of the epitope for MCA-6H12 is shown in bold and red below, the protein sequence was taken from AY233272, download here

    1 MVSKGAELFT GIVPILIELN GDVNGHKFSV SGEGEGDATY GKLTLKFICT TGKLPVPWPT
   61 LVTTLSYGVQ CFSRYPDHMK QHDFFKSAMP EGYIQERTIF FEDDGNYKSR AEVKFEGDTL
  121 VNRIELTGTD FKEDGNILGN KMEYNYNAHN VYIMTDKAKN GIKVNFKIRH NIEDGSVQLA
  181 DHYQQNTPIG DGPVLLPDNH YLSTQSALSK DPNEKRDHMI YFGFVTAAAI THGMDELYK

This construct is available as PROT-r-AcGFP

1. Shimomura O, Johnson FH, Saiga Y. Extraction, purification and properties of aequorin, a bioluminescent protein from the luminous hydromedusan, Aequorea. J. Cell. Comp. Physiol. 3:223–39 (1962).
2. Shimomura, O. Structure of the chromophore of Aequorea green fluorescent protein. FEBS Lett. 104:220–2 (1979).
3. Prasher DC, et al. Primary structure of the Aequorea victoria green-fluorescent protein. Gene 111:229-33 (1992).
4. Cody CW, et al. Chemical structure of the hexapeptide chromophore of the Aequorea green-fluorescent protein. Biochem. 32:1212-8 (1993).
5. Chalfie M, et al. Green Fluorescent protein as a marker for gene expression. Science 263:802-5 (1994).
6. Heim R, Prasher DC, Tsien RY. Wavelength mutations and post-translational autoxidation of green fluorescent protein. PNAS 91:12501-04 (1994).
7. Ormo M, et al. Crystal structure of the Aequorea victoria green fluorescent protein. Science 273:1392-95 (1996).
8. Tsien RY. The green fluorescent protein. Annu. Rev. Biochem. 67:509-44 (1998).
9. Zacharias DA, Violin JD, Newton AC, Tsien RY. Partitioning of lipid-modified monomeric GFPs into membrane microdomains of live cells. Science 296:913-6 (2002).
10. Gurskaya NG, et al. A colourless green fluorescent protein homologue from the non-fluorescent hydromedusa Aequorea coerulescens and its fluorescent mutants. Biochem. J. 373:403-8 (2003).

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