Recombinant E. coli Methionine Aminopeptidase/METAP, CF

• Reactivity: Ec
• Applications: Enzyme Activity
• Format: Carrier-Free

Recombinant E. coli Methionine Aminopeptidase/METAP, CF Summary

• Details of Functionality: Measure by its ability to remove methionine from a fluorogenic peptide substrate H-Met-Gly-Pro-AMC (Catalog # ES017). The resulting GP-AMC is cleaved by Recombinant Human DPPIV/CD26 (Catalog # 9168-SE). The specific activity is >0.5 pmol/min/µg, as measured under the described conditions. See Activity Assay Protocol on www.RnDSystems.com.
• Source: E. coli-derived e. coli Methionine Aminopeptidase protein
  Ala2-Glu264, with a C-terminal 10-His tag
• Accession #: NP_414710
• N-terminal Sequence: Ala2
• Protein/Peptide Type: Recombinant Enzymes
• Gene: map
• Purity: >85%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining
• Endotoxin Note: <1.0 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

• Dilutions:
  • Enzyme Activity
• Theoretical MW: 31 kDa.
  Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
• SDS-PAGE: 36 kDa, reducing conditions

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 6 months from date of receipt, -70 °C as supplied.
  • 3 months, -70 °C under sterile conditions after opening.
• Buffer: Supplied as a 0.2 μm filtered solution in Tris, NaCl and Glycerol.
• Purity: >85%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining
• Assay Procedure:
  • Activation Buffer: 50 mM HEPES, 0.1 mM CoCl₂, 0.1 M NaCl, pH 7.5
  • Assay Buffer: 25 mM Tris, pH 8.0
  • Recombinant E. coli Methionine Aminopeptidase (reMAP) (Catalog # 1628-ZN)
  • Recombinant Human DPPIV/CD26 (rhDPPIV) (Catalog # 9168-SE)
  • Substrate: H-Met-Gly-Pro-AMC (Catalog # ES017)
  • F16 Black Maxisorp Plate (Nunc Catalog # 475515)
  • Fluorescent Plate Reader (Model: SpectraMax Gemini EM by Molecular Devices) or equivalent
  1. Dilute reMAP to 40 µg/mL in Activation Buffer.
  2. Dilute Substrate to 200 µM in Activation Buffer.
  3. Mix 100 µL of 40 µg/mL reMAP with 100 µL 200 µM Substrate. Include a Substrate Blank containing 100 µL of Activation Buffer and 100 µL 200 µM Substrate.
  4. Incubate at 37 °C for 15 minutes.
  5. Stop the reaction by heating for 5 minutes at 95 to 100 °C.
  6. Place reactions on ice for 3 minutes, then spin briefly.
  7. Dilute rhDPPIV/CD26 to 2 µg/mL in Assay Buffer.
  8. Load 50 µL of reaction mixture into a plate and add 50 µL of 2 µg/mL rhDPPIV/CD26.
  9. Incubate plate with shaking for 10 minutes at room temperature.
  10. Read at excitation and emission wavelengths of 380 nm and 460 nm (top read), respectively in endpoint mode.
  11. Calculate specific activity:

      Specific Activity (pmol/min/µg) = (Adjusted Fluorescence* (RFU) x Conversion Factor** (pmol/RFU)) / (Incubation time (min) x amount of enzyme (µg))

      *Adjusted for Substrate Blank

      **Derived using calibration standard 7-Amino, 4-Methyl Coumarin (AMC) (Sigma, Catalog # A9891).

  Per Well:
  • reMAP: 1 µg
  • rhDPPIV/CD26: 0.100 µg
  • Substrate: 50 µM

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant E. coli Methionine Aminopeptidase/METAP, CF

• Methionine Aminopeptidase

Background

Methionine Aminopeptidase (METAP) carries out the important reaction of removing the initiator Met residue from nascent proteins. There are two types of METAP (1, 2). Type Ia and type IIa are found in eubacteria and archaea, respectively. Type Ib and type IIb are present in eukaryotes and contain additional N-terminal domains. As a metalloenzyme, METAP activity can be inhibited by EDTA. However, the exact identity of the metal ion remains to be uncovered since several metal ions including cobalt, zinc and iron have been suggested (3). 

1. Bradshaw, R.A. et al. (1998) Trends Biochem. Sci. 23:263.
2. Lowether, W.T. and B.W. Matthews (2000) Biochim. Biophys. Acta 1477:157.
3. Li, J-Y. et al. (2003) Biochem. Biophys. Res. Comm. 307:172.

Bioinformatics

• Gene Symbol: map
• Uniprot:
  • NP_414710()