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Phos-FLAG is a phosphorylated FLAG peptide. Phos-FLAG can undergo a Staudinger-like linkage reaction with azide groups metabolized into cell surface glycans and organ glycoproteins, enabling quantitative analysis of the presence of cell surface azides. Phos-FLAG can detect azide-labeled glycans in isolated cell and organ lysates.

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Phos-FLAG

Phos-FLAG Chemical Structure

CAS No. : 403481-00-5

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Description

Phos-FLAG is a phosphorylated FLAG peptide. Phos-FLAG can undergo a Staudinger-like linkage reaction with azide groups metabolized into cell surface glycans and organ glycoproteins, enabling quantitative analysis of the presence of cell surface azides. Phos-FLAG can detect azide-labeled glycans in isolated cell and organ lysates[1].

In Vivo

Phos-Flag (250-500 μM; ex vivo incubation; 1-12 h; room temperature) mediates specific, detectable Staudinger ligation with metabolically introduced azides on mouse splenocyte and organ glycoproteins ex vivo, producing dose-dependent and tissue-specific labelling signals[1].
Phos-Flag (16 μmol; i.p.; single dose; 24 hours after final Ac4ManNAz injection) successfully mediates Staudinger ligation with metabolically introduced azides on mouse splenocytes in vivo, producing detectable cell-surface Flag epitopes with no observed toxicity[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Model: Es1^e/Es1^e mice (plasma esterase-deficient, male and female); B6D2F1 mice (wild-type, male and female)[1]
Dosage: 250 μM (ex vivo incubation for 1 h); 500 μM (ex vivo incubation for 6-12 h)
Administration: ex vivo incubation; 1 h (250 μM); 6-12 h (500 μM); room temperature
Result: Exhibited a dose-dependent increase in mean fluorescence intensity (MFI) in splenocytes from Ac4ManNAz-treated mice, with MFI values significantly higher than vehicle-treated controls.
Detected discrete labelled glycoprotein bands in heart, kidney, and liver lysates from Ac4ManNAz-treated mice, but not in brain or thymus homogenates.
Significantly reduced MFI after Phos-Flag labelling in sialidase-treated splenocytes from Ac4ManNAz-treated mice, confirming azide label presence on sialic acids.
Animal Model: C57BL/6 mice[1]
Dosage: 16 μmol
Administration: i.p.; single dose; 24 hours after final Ac4ManNAz injection
Result: Showed a significant increase in MFI in splenocytes from mice treated with both Ac4ManNAz and Phos-Flag relative to untreated mice or mice treated with only one agent.
Produced a larger MFI increase in ex vivo Phos-Flag treatment of splenocytes from mice given only Ac4ManNAz compared to ex vivo treatment of splenocytes from mice given both Ac4ManNAz and in vivo Phos-Flag, indicating significant in vivo Staudinger ligation of cell-surface azides.
Observed no adverse physiological effects in mice after administration.
Molecular Weight

1359.29

Formula

C62H75N10O23P

CAS No.
SMILES

O=C(OC)C(C=C1)=C(P(C2=CC=CC=C2)C3=CC=CC=C3)C=C1C(N[C@@H](CC(O)=O)C(N[C@@H](CC4=CC=C(C=C4)O)C(N[C@@H](CCCCN)C(N[C@@H](CC(O)=O)C(N[C@@H](CC(O)=O)C(N[C@@H](CC(O)=O)C(N[C@@H](CC(O)=O)C(N[C@@H](CCCCN)C(O)=O)=O)=O)=O)=O)=O)=O)=O)=O

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Room temperature in continental US; may vary elsewhere.

Storage

Please store the product under the recommended conditions in the Certificate of Analysis.

Purity & Documentation
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Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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Phos-FLAG
Cat. No.:
HY-P11710
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