Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6018
Number of amino acids:84
Molecular Weight:8914.24 Da
Theoretical pI:5.79


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)78.33%
Cysteine CYS (C)89.52%
Glutamic Acid GLU (E)44.76%
Aspartic Acid ASP (D)33.57%
Glycine GLY (G)67.14%
Phynylalanine PHE (F)44.76%
Isoleucine ILE (I)22.38%
Histidine HIS (H)33.57%
Lysine LYS (K)33.57%
Methionine MET (M)44.76%
Leucine LEU (L)55.95%
Asparagine ASN (N)22.38%
Glutamine GLN (Q)11.19%
Proline PRO (P)55.95%
Serine SER (S)910.71%
Arginine ARG (R)22.38%
Threonine THR (T)89.52%
Tryptophan TRP (W)00%
Valine VAL (V)67.14%
Tyrosine TYR (Y)22.38%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC380
HydrogenH596
NitrogenN102
OxygenO121
SulphurS12

FormulaC380H596N102O121S12
Total Number of Atoms:1211


Total number of positively charged residues (ARG + LYS):5
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    3480
Absorption 0.1% (=1 g/l)    0.390,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.334,   assuming all CYS residues are reduced
Aromaticity:0.071

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 48.92

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.62, 26.19, 23.81]

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:61.5476
Grand average of hydropathicity (GRAVY):0.16