Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5344
Number of amino acids:185
Molecular Weight:19892.56 Da
Theoretical pI:4.97


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)179.19%
Cysteine CYS (C)63.24%
Glutamic Acid GLU (E)84.32%
Aspartic Acid ASP (D)126.49%
Glycine GLY (G)94.86%
Phynylalanine PHE (F)73.78%
Isoleucine ILE (I)137.03%
Histidine HIS (H)21.08%
Lysine LYS (K)115.95%
Methionine MET (M)10.54%
Leucine LEU (L)2412.97%
Asparagine ASN (N)84.32%
Glutamine GLN (Q)105.41%
Proline PRO (P)105.41%
Serine SER (S)2513.51%
Arginine ARG (R)42.16%
Threonine THR (T)84.32%
Tryptophan TRP (W)00%
Valine VAL (V)52.7%
Tyrosine TYR (Y)52.7%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC876
HydrogenH1402
NitrogenN230
OxygenO282
SulphurS7

FormulaC876H1402N230O282S7
Total Number of Atoms:2797


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):20
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    7825
Absorption 0.1% (=1 g/l)    0.393,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.375,   assuming all CYS residues are reduced
Aromaticity:0.065

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.77

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.19, 28.11, 27.03]

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:95.0271
Grand average of hydropathicity (GRAVY):-0.08