Physicochemical Properties of Peptide



PPepDB ID:PPepDB_848
Number of amino acids:77
Molecular Weight:8524.23 Da
Theoretical pI:7.57


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)67.79%
Cysteine CYS (C)67.79%
Glutamic Acid GLU (E)33.9%
Aspartic Acid ASP (D)33.9%
Glycine GLY (G)33.9%
Phynylalanine PHE (F)45.19%
Isoleucine ILE (I)33.9%
Histidine HIS (H)11.3%
Lysine LYS (K)56.49%
Methionine MET (M)33.9%
Leucine LEU (L)1215.58%
Asparagine ASN (N)45.19%
Glutamine GLN (Q)22.6%
Proline PRO (P)45.19%
Serine SER (S)33.9%
Arginine ARG (R)22.6%
Threonine THR (T)45.19%
Tryptophan TRP (W)00%
Valine VAL (V)79.09%
Tyrosine TYR (Y)22.6%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC382
HydrogenH618
NitrogenN96
OxygenO105
SulphurS9

FormulaC382H618N96O105S9
Total Number of Atoms:1210


Total number of positively charged residues (ARG + LYS):7
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)    0.394,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.350,   assuming all CYS residues are reduced
Aromaticity:0.078

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 19.95

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[36.36, 18.18, 31.17]

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:110.13
Grand average of hydropathicity (GRAVY):0.55