Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2486
Number of amino acids:30
Molecular Weight:3149.65 Da
Theoretical pI:4.37


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)620%
Glutamic Acid GLU (E)13.33%
Aspartic Acid ASP (D)13.33%
Glycine GLY (G)413.33%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)310%
Histidine HIS (H)00%
Lysine LYS (K)13.33%
Methionine MET (M)00%
Leucine LEU (L)13.33%
Asparagine ASN (N)13.33%
Glutamine GLN (Q)00%
Proline PRO (P)26.67%
Serine SER (S)310%
Arginine ARG (R)00%
Threonine THR (T)26.67%
Tryptophan TRP (W)00%
Valine VAL (V)26.67%
Tyrosine TYR (Y)310%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC133
HydrogenH206
NitrogenN32
OxygenO44
SulphurS6

FormulaC133H206N32O44S6
Total Number of Atoms:421


Total number of positively charged residues (ARG + LYS):1
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    4845
Absorption 0.1% (=1 g/l)    1.538,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    1.419,   assuming all CYS residues are reduced
Aromaticity:0.100

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 35.81

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.00, 33.33, 6.67]

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:71.3333
Grand average of hydropathicity (GRAVY):0.46