Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4840
Number of amino acids:78
Molecular Weight:8404.9 Da
Theoretical pI:4.99


Amino Acid Composition:


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


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC368
HydrogenH593
NitrogenN91
OxygenO112
SulphurS10

FormulaC368H593N91O112S10
Total Number of Atoms:1174


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):7
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)    0.769,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.709,   assuming all CYS residues are reduced
Aromaticity:0.077

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 52.59

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.62, 24.36, 17.95]

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:102.436
Grand average of hydropathicity (GRAVY):0.58