PNC-27 Reconstitution Chart (Every Vial Size)

Overview of PNC-27 in Laboratory Research

PNC-27 is a synthetic membrane-active peptide studied extensively in preclinical oncology models for its unique mechanism of membrane interaction. Structurally comprising an HDM-2-binding domain coupled to a transmembrane-penetrating leader sequence, PNC-27 has gained significant attention in laboratory settings evaluating targeted cellular lysis.

In vitro data indicate that PNC-27 selectively binds membrane-bound HDM-2 expressed on cancer cell lines. Upon binding, the peptide induces transmembrane pore formation, leading to rapid cell membrane disruption and necrosis. Crucially, preclinical evidence demonstrates that this necrogenic process occurs independently of the p53 tumor suppressor pathway. To maintain exact concentration thresholds during assay preparation, researchers must consult reliable reconstitution parameters across all all-peptides cataloged for cell culture research.

PNC-27 Reconstitution Mathematics & Universal Formula

Achieving exact target concentrations requires a standard volumetric conversion. The mathematical relationship governing peptide reconstitution relies on total peptide mass divided by total diluent volume added to the lyophilized vial.

The standard formula for concentration is: Concentration (mg/mL) = Total Mass of Peptide (mg) ÷ Volume of Diluent Added (mL). To determine the mass delivered per sub-milliliter aliquot (e.g., 0.1 mL or 10 units on a standard volumetric laboratory syringe), multiply the final concentration (mg/mL) by 0.1 mL.

Researchers using interactive tools can streamline these volumetric steps with the PX1 reconstitution-calculator, which automates conversions across diverse vial sizes and reconstituting solvents.

PNC-27 Reconstitution Chart: Concentration Matrix

The following matrix outlines resulting concentrations across standard mass offerings (2 mg, 5 mg, and 10 mg vials) paired with typical diluent volumes. Use this table as an immediate reference for benchtop assay preparations.

| Vial Mass | Diluent Volume | Resulting Concentration (mg/mL) | Peptide Mass per 0.1 mL (100 µL) | |---|---|---|---| | 2 mg | 1.0 mL | 2.0 mg/mL | 0.20 mg (200 µg) | | 2 mg | 2.0 mL | 1.0 mg/mL | 0.10 mg (100 µg) | | 5 mg | 1.0 mL | 5.0 mg/mL | 0.50 mg (500 µg) | | 5 mg | 2.0 mL | 2.5 mg/mL | 0.25 mg (250 µg) | | 5 mg | 2.5 mL | 2.0 mg/mL | 0.20 mg (200 µg) | | 5 mg | 5.0 mL | 1.0 mg/mL | 0.10 mg (100 µg) | | 10 mg | 1.0 mL | 10.0 mg/mL | 1.00 mg (1000 µg) | | 10 mg | 2.0 mL | 5.0 mg/mL | 0.50 mg (500 µg) | | 10 mg | 2.5 mL | 4.0 mg/mL | 0.40 mg (400 µg) | | 10 mg | 5.0 mL | 2.0 mg/mL | 0.20 mg (200 µg) |

This lookup reference allows researchers to rapidly adjust pipette volumes during microplate loading without risking stoichiometry errors.

Worked Reconstitution Examples for Benchtop Protocols

Example A: A researcher requires a 2.5 mg/mL solution using a 5 mg vial of lyophilized PNC-27. Following the universal equation, 5 mg divided by 2.5 mg/mL yields 2.0 mL. Adding 2.0 mL of sterile diluent to the 5 mg vial yields a 2.5 mg/mL working solution, delivering 0.25 mg (250 µg) per 0.1 mL aliquot.

Example B: A high-throughput screening protocol requires a final concentration of 4.0 mg/mL using a 10 mg vial of PNC-27. Dividing 10 mg by 4.0 mg/mL dictates a diluent volume of 2.5 mL. Reconstitution with 2.5 mL of solvent provides 4.0 mg/mL, corresponding to 0.40 mg (400 µg) per 0.1 mL aliquot.

Solvent Selection & Chemical Compatibility

Choosing the appropriate diluent depends on the intended analytical assay. Bacteriostatic Water containing 0.9% benzyl alcohol is commonly used for multi-dose laboratory sampling due to its antimicrobial properties, extending solution stability under refrigeration.

Sterile Water for Injection (SWFI) or sterile physiological saline (0.9% NaCl) may be selected for short-term in vitro cellular assays where benzyl alcohol could interfere with membrane integrity dynamics. For specialized biophysical analyses, such as circular dichroism or nuclear magnetic resonance (NMR), low-ionic-strength buffers or dimethyl sulfoxide (DMSO) stock solutions may be utilized under controlled pH parameters.

Step-by-Step Laboratory Reconstitution Protocol

1. Prepare a clean, aseptic workspace inside a laminar flow hood or biological safety cabinet. Sanitize the workspace surface and all reagent containers with 70% isopropyl alcohol.

2. Remove the protective flip-off cap from the lyophilized PNC-27 vial and sanitize the rubber stopper with an alcohol swab. Allow it to air-dry completely.

3. Using a sterile syringe equipped with a suitable gauge needle, draw the exact pre-calculated volume of diluent (e.g., Bacteriostatic Water).

4. Insert the needle into the vial at a 45-degree angle, directing the stream of solvent down the glass wall of the vial. Avoid spraying directly onto the lyophilized powder cake to minimize foam formation.

5. Allow the diluent to naturally saturate the powder cake. Gently swirl the vial in a circular motion until the peptide is fully dissolved. Do not shake vigorously, as mechanical shear stress can cause protein denaturation or aggregation.

6. Inspect the reconstituted solution visually under clear lighting. The final liquid should be clear, colorless, and free of visible particulate matter prior to experimental use.

PNC-27 Mechanism of Action & Preclinical Evidence

Preclinical studies suggest that PNC-27 exerts its cytotoxic effects via physical membrane perturbation rather than receptor-mediated apoptotic pathways. The peptide possesses an amphipathic alpha-helical domain that specifically targets HDM-2 protein expressed on the outer cell membranes of transformed cells.

In vitro assays demonstrate that upon binding to membrane HDM-2, PNC-27 oligomerizes and forms transmembrane pores. This rapid pore formation results in loss of membrane potential, cellular swelling, and subsequent non-apoptotic necrosis. Because this mechanism acts independently of wild-type p53 status, PNC-27 is frequently studied in p53-mutant or p53-null cancer models to assess broad-spectrum membrane-disruptive activity.

Comparative Analysis: PNC-27 vs. Related Research Compounds

Within the domain of targeted research peptides, PNC-27 is often evaluated alongside structural analogs and alternative membrane-active peptides to compare mechanisms of action, cell selectivity, and biophysical properties.

For instance, researchers frequently contrast PNC-27 with PNC-28, another HDM-2 binding peptide derived from a similar structural motif that exhibits comparable pore-forming properties in solid tumor models. While PNC-27 targets membrane-bound HDM-2, other laboratory compounds such as BPC-157 target intracellular signaling pathways involved in tissue repair and angiogenesis, and MT-2 acts as a selective melanocortin receptor agonist. Comparing these distinct classes highlights the specific utility of PNC-27 as a specialized membrane-disruptive research tool.

PX1 Research Quality Control & Analytical Verification

Precise reconstitution calculations must be backed by absolute material purity. Every batch of PNC-27 supplied by PX1 Research undergoes stringent quality verification in ISO 17025 accredited analytical facilities.

We verify peptide identity and sequence purity via High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS). Each lot is tested for bacterial endotoxins using limulus amebocyte lysate (LAL) assays to ensure total endotoxin levels remain below strict laboratory research standards. Researchers can inspect batch-specific documentation at any time on our dedicated coa page, or establish institutional supply lines via our wholesale laboratory portal.

Storage, Handling, and Degradation Mitigation

Lyophilized PNC-27 should be stored at -20°C in a desiccated environment away from direct light. Under these conditions, the dry peptide powder remains stable for up to 24 months from the date of manufacture.

Once reconstituted with bacteriostatic diluent, the liquid solution should be stored at 2°C to 8°C and utilized within 28 days. Avoid repeated freeze-thaw cycles of reconstituted liquid solutions, as freeze-thaw stress accelerates peptide chain degradation and loss of functional concentration. For long-term storage of working aliquots, freeze liquid solutions at -80°C in single-use polypropylene microtubes.