Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1345
Number of amino acids:64
Molecular Weight:7157.3 Da
Theoretical pI:8.47


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)34.69%
Cysteine CYS (C)812.5%
Glutamic Acid GLU (E)34.69%
Aspartic Acid ASP (D)23.13%
Glycine GLY (G)57.81%
Phynylalanine PHE (F)46.25%
Isoleucine ILE (I)11.56%
Histidine HIS (H)23.13%
Lysine LYS (K)57.81%
Methionine MET (M)34.69%
Leucine LEU (L)23.13%
Asparagine ASN (N)00%
Glutamine GLN (Q)57.81%
Proline PRO (P)46.25%
Serine SER (S)57.81%
Arginine ARG (R)34.69%
Threonine THR (T)46.25%
Tryptophan TRP (W)00%
Valine VAL (V)34.69%
Tyrosine TYR (Y)23.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC304
HydrogenH475
NitrogenN87
OxygenO91
SulphurS11

FormulaC304H475N87O91S11
Total Number of Atoms:968


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):5
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)    0.486,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.416,   assuming all CYS residues are reduced
Aromaticity:0.094

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 62.45

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.75, 21.88, 17.19]

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:36.5625
Grand average of hydropathicity (GRAVY):-0.39