Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6157
Number of amino acids:122
Molecular Weight:13728.34 Da
Theoretical pI:9.92


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)97.38%
Cysteine CYS (C)10.82%
Glutamic Acid GLU (E)21.64%
Aspartic Acid ASP (D)10.82%
Glycine GLY (G)10.82%
Phynylalanine PHE (F)75.74%
Isoleucine ILE (I)54.1%
Histidine HIS (H)00%
Lysine LYS (K)119.02%
Methionine MET (M)32.46%
Leucine LEU (L)1411.48%
Asparagine ASN (N)64.92%
Glutamine GLN (Q)43.28%
Proline PRO (P)2822.95%
Serine SER (S)86.56%
Arginine ARG (R)32.46%
Threonine THR (T)64.92%
Tryptophan TRP (W)00%
Valine VAL (V)43.28%
Tyrosine TYR (Y)97.38%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC655
HydrogenH1004
NitrogenN152
OxygenO162
SulphurS4

FormulaC655H1004N152O162S4
Total Number of Atoms:1977


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):3
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    13410
Absorption 0.1% (=1 g/l)    0.977,   assuming all pairs of CYS residues form cystines

Ext. coefficient    13410
Absorption 0.1% (=1 g/l)    0.977,   assuming all CYS residues are reduced
Aromaticity:0.131

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 70.66

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.97, 35.25, 22.95]

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:77.6229
Grand average of hydropathicity (GRAVY):-0.27