Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1132
Number of amino acids:198
Molecular Weight:20895.47 Da
Theoretical pI:5.73


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)178.59%
Cysteine CYS (C)126.06%
Glutamic Acid GLU (E)147.07%
Aspartic Acid ASP (D)31.52%
Glycine GLY (G)126.06%
Phynylalanine PHE (F)31.52%
Isoleucine ILE (I)178.59%
Histidine HIS (H)21.01%
Lysine LYS (K)136.57%
Methionine MET (M)31.52%
Leucine LEU (L)2512.63%
Asparagine ASN (N)147.07%
Glutamine GLN (Q)21.01%
Proline PRO (P)84.04%
Serine SER (S)189.09%
Arginine ARG (R)21.01%
Threonine THR (T)147.07%
Tryptophan TRP (W)00%
Valine VAL (V)157.58%
Tyrosine TYR (Y)42.02%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC916
HydrogenH1521
NitrogenN237
OxygenO285
SulphurS15

FormulaC916H1521N237O285S15
Total Number of Atoms:2974


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):17
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    6710
Absorption 0.1% (=1 g/l)    0.321,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.285,   assuming all CYS residues are reduced
Aromaticity:0.035

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 29.20

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.32, 26.26, 29.80]

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:113.283
Grand average of hydropathicity (GRAVY):0.41