Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6020
Number of amino acids:87
Molecular Weight:9924.75 Da
Theoretical pI:8.44


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)55.75%
Cysteine CYS (C)89.2%
Glutamic Acid GLU (E)33.45%
Aspartic Acid ASP (D)66.9%
Glycine GLY (G)22.3%
Phynylalanine PHE (F)44.6%
Isoleucine ILE (I)78.05%
Histidine HIS (H)22.3%
Lysine LYS (K)89.2%
Methionine MET (M)11.15%
Leucine LEU (L)66.9%
Asparagine ASN (N)33.45%
Glutamine GLN (Q)33.45%
Proline PRO (P)66.9%
Serine SER (S)33.45%
Arginine ARG (R)44.6%
Threonine THR (T)33.45%
Tryptophan TRP (W)00%
Valine VAL (V)910.34%
Tyrosine TYR (Y)44.6%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC444
HydrogenH707
NitrogenN117
OxygenO122
SulphurS9

FormulaC444H707N117O122S9
Total Number of Atoms:1399


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):9
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    6460
Absorption 0.1% (=1 g/l)    0.651,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.601,   assuming all CYS residues are reduced
Aromaticity:0.092

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 26.64

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.48, 16.09, 17.24]

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:94.0229
Grand average of hydropathicity (GRAVY):0.07