Simple Protein pI
Estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve.
Description
Estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve.
Simple Protein pI is a focused biology tool that estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use Simple Protein pI
Use Simple Protein pI when you need to estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve. Enter Acidic residues and Basic residues using the definitions and units below so the result can be reproduced.
- Acidic residues
- An integer count or setting greater than or equal to 0.
- Basic residues
- An integer count or setting greater than or equal to 0.
How Simple Protein pI calculates the result
The published tool contract uses this rule: Estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve.
- Isoelectric point estimate
- The calculated isoelectric point estimate.
Limitations of Simple Protein pI
The output is an estimate tied to the stated model and coefficients; it is not a direct measurement and should retain that label when reported.
Alternative or Complementary measurements
Retain the original Acidic residues and Basic residues values and their units alongside the result. Protein MW From Length is useful when you instead need to estimate protein molecular weight from residue count using the mean residue mass of 110 daltons. PER Calculator provides another view by helping you compute the protein efficiency ratio as weight gain in grams divided by protein consumed in grams; the ratio is signed and cannot fall below minus one.
References
-
Isoelectric point — Wikipedia contributors
Similar or alternative tools
- Protein MW From Length
Estimate protein molecular weight from residue count using the mean residue mass of 110 daltons.
- PER Calculator
Compute the protein efficiency ratio as weight gain in grams divided by protein consumed in grams; the ratio is signed and cannot fall below minus one.
- Bradford Protein Conc
Convert a Bradford assay A595 reading into protein concentration using the slope of the standard curve.