Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6069
Number of amino acids:125
Molecular Weight:12876.61 Da
Theoretical pI:3.8


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1411.2%
Cysteine CYS (C)10.8%
Glutamic Acid GLU (E)54%
Aspartic Acid ASP (D)43.2%
Glycine GLY (G)10.8%
Phynylalanine PHE (F)75.6%
Isoleucine ILE (I)108%
Histidine HIS (H)00%
Lysine LYS (K)10.8%
Methionine MET (M)10.8%
Leucine LEU (L)1411.2%
Asparagine ASN (N)21.6%
Glutamine GLN (Q)32.4%
Proline PRO (P)1612.8%
Serine SER (S)2822.4%
Arginine ARG (R)10.8%
Threonine THR (T)97.2%
Tryptophan TRP (W)00%
Valine VAL (V)64.8%
Tyrosine TYR (Y)21.6%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC583
HydrogenH918
NitrogenN134
OxygenO188
SulphurS2

FormulaC583H918N134O188S2
Total Number of Atoms:1825


Total number of positively charged residues (ARG + LYS):2
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    2980
Absorption 0.1% (=1 g/l)    0.231,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.231,   assuming all CYS residues are reduced
Aromaticity:0.072

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 75.42

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.20, 37.60, 27.20]

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:100
Grand average of hydropathicity (GRAVY):0.46