Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3881
Number of amino acids:91
Molecular Weight:9172.63 Da
Theoretical pI:9.07


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1112.09%
Cysteine CYS (C)88.79%
Glutamic Acid GLU (E)11.1%
Aspartic Acid ASP (D)22.2%
Glycine GLY (G)1010.99%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)66.59%
Histidine HIS (H)00%
Lysine LYS (K)55.49%
Methionine MET (M)00%
Leucine LEU (L)88.79%
Asparagine ASN (N)55.49%
Glutamine GLN (Q)33.3%
Proline PRO (P)55.49%
Serine SER (S)88.79%
Arginine ARG (R)44.4%
Threonine THR (T)88.79%
Tryptophan TRP (W)00%
Valine VAL (V)55.49%
Tyrosine TYR (Y)22.2%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC387
HydrogenH654
NitrogenN116
OxygenO124
SulphurS8

FormulaC387H654N116O124S8
Total Number of Atoms:1289


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):3
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)    0.379,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.325,   assuming all CYS residues are reduced
Aromaticity:0.022

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.32

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.08, 30.77, 21.98]

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:88.022
Grand average of hydropathicity (GRAVY):0.17