Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3371
Number of amino acids:28
Molecular Weight:3108.56 Da
Theoretical pI:8.17


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)27.14%
Cysteine CYS (C)13.57%
Glutamic Acid GLU (E)13.57%
Aspartic Acid ASP (D)00%
Glycine GLY (G)27.14%
Phynylalanine PHE (F)27.14%
Isoleucine ILE (I)00%
Histidine HIS (H)27.14%
Lysine LYS (K)27.14%
Methionine MET (M)00%
Leucine LEU (L)414.29%
Asparagine ASN (N)310.71%
Glutamine GLN (Q)00%
Proline PRO (P)13.57%
Serine SER (S)310.71%
Arginine ARG (R)00%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)310.71%
Tyrosine TYR (Y)27.14%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC143
HydrogenH215
NitrogenN37
OxygenO39
SulphurS1

FormulaC143H215N37O39S1
Total Number of Atoms:435


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):1
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.959,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.959,   assuming all CYS residues are reduced
Aromaticity:0.143

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 34.95

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[39.29, 32.14, 25.00]

Amino acids in helix: V, I, Y, F, W, L || Amino acids in turn: N, P, G, S || Amino acids in sheet: E, M, A, L
Aliphatic index:93.9286
Grand average of hydropathicity (GRAVY):0.14