Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2438
Number of amino acids:30
Molecular Weight:3211.85 Da
Theoretical pI:7.74


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.33%
Cysteine CYS (C)723.33%
Glutamic Acid GLU (E)26.67%
Aspartic Acid ASP (D)00%
Glycine GLY (G)516.67%
Phynylalanine PHE (F)13.33%
Isoleucine ILE (I)413.33%
Histidine HIS (H)13.33%
Lysine LYS (K)26.67%
Methionine MET (M)13.33%
Leucine LEU (L)00%
Asparagine ASN (N)13.33%
Glutamine GLN (Q)00%
Proline PRO (P)13.33%
Serine SER (S)00%
Arginine ARG (R)13.33%
Threonine THR (T)26.67%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)13.33%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC132
HydrogenH212
NitrogenN38
OxygenO39
SulphurS8

FormulaC132H212N38O39S8
Total Number of Atoms:429


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):2
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    1865
Absorption 0.1% (=1 g/l)    0.581,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.464,   assuming all CYS residues are reduced
Aromaticity:0.067

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.84

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[20.00, 23.33, 13.33]

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:55.3332
Grand average of hydropathicity (GRAVY):0.32