Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1517
Number of amino acids:94
Molecular Weight:9803.39 Da
Theoretical pI:6.7


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)88.51%
Cysteine CYS (C)77.45%
Glutamic Acid GLU (E)66.38%
Aspartic Acid ASP (D)11.06%
Glycine GLY (G)77.45%
Phynylalanine PHE (F)22.13%
Isoleucine ILE (I)77.45%
Histidine HIS (H)11.06%
Lysine LYS (K)77.45%
Methionine MET (M)00%
Leucine LEU (L)1111.7%
Asparagine ASN (N)99.57%
Glutamine GLN (Q)00%
Proline PRO (P)44.26%
Serine SER (S)88.51%
Arginine ARG (R)00%
Threonine THR (T)77.45%
Tryptophan TRP (W)00%
Valine VAL (V)77.45%
Tyrosine TYR (Y)22.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC428
HydrogenH704
NitrogenN112
OxygenO135
SulphurS7

FormulaC428H704N112O135S7
Total Number of Atoms:1386


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):7
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    3355
Absorption 0.1% (=1 g/l)    0.342,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.304,   assuming all CYS residues are reduced
Aromaticity:0.043

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 22.75

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.85, 29.79, 26.60]

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:104.787
Grand average of hydropathicity (GRAVY):0.33