Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1125
Number of amino acids:78
Molecular Weight:8403.03 Da
Theoretical pI:6.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)810.26%
Cysteine CYS (C)78.97%
Glutamic Acid GLU (E)56.41%
Aspartic Acid ASP (D)11.28%
Glycine GLY (G)45.13%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)33.85%
Histidine HIS (H)11.28%
Lysine LYS (K)22.56%
Methionine MET (M)33.85%
Leucine LEU (L)911.54%
Asparagine ASN (N)45.13%
Glutamine GLN (Q)33.85%
Proline PRO (P)56.41%
Serine SER (S)11.28%
Arginine ARG (R)45.13%
Threonine THR (T)56.41%
Tryptophan TRP (W)00%
Valine VAL (V)1114.1%
Tyrosine TYR (Y)22.56%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC363
HydrogenH607
NitrogenN101
OxygenO106
SulphurS10

FormulaC363H607N101O106S10
Total Number of Atoms:1187


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):6
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)    0.399,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.355,   assuming all CYS residues are reduced
Aromaticity:0.026

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 27.80

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.05, 17.95, 32.05]

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:111.154
Grand average of hydropathicity (GRAVY):0.52