Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6161
Number of amino acids:78
Molecular Weight:8727.33 Da
Theoretical pI:8.09


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)45.13%
Cysteine CYS (C)911.54%
Glutamic Acid GLU (E)56.41%
Aspartic Acid ASP (D)22.56%
Glycine GLY (G)67.69%
Phynylalanine PHE (F)22.56%
Isoleucine ILE (I)78.97%
Histidine HIS (H)00%
Lysine LYS (K)56.41%
Methionine MET (M)45.13%
Leucine LEU (L)78.97%
Asparagine ASN (N)33.85%
Glutamine GLN (Q)78.97%
Proline PRO (P)22.56%
Serine SER (S)45.13%
Arginine ARG (R)45.13%
Threonine THR (T)33.85%
Tryptophan TRP (W)00%
Valine VAL (V)22.56%
Tyrosine TYR (Y)22.56%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC369
HydrogenH611
NitrogenN105
OxygenO112
SulphurS13

FormulaC369H611N105O112S13
Total Number of Atoms:1210


Total number of positively charged residues (ARG + LYS):9
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    3480
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)    0.341,   assuming all CYS residues are reduced
Aromaticity:0.051

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 54.48

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.64, 19.23, 25.64]

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:82.5641
Grand average of hydropathicity (GRAVY):-0.01