Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3750
Number of amino acids:29
Molecular Weight:3222.92 Da
Theoretical pI:6.01


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.45%
Cysteine CYS (C)517.24%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)310.34%
Glycine GLY (G)00%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)26.9%
Histidine HIS (H)00%
Lysine LYS (K)26.9%
Methionine MET (M)13.45%
Leucine LEU (L)413.79%
Asparagine ASN (N)13.45%
Glutamine GLN (Q)26.9%
Proline PRO (P)26.9%
Serine SER (S)13.45%
Arginine ARG (R)13.45%
Threonine THR (T)13.45%
Tryptophan TRP (W)00%
Valine VAL (V)310.34%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC135
HydrogenH233
NitrogenN37
OxygenO41
SulphurS6

FormulaC135H233N37O41S6
Total Number of Atoms:452


Total number of positively charged residues (ARG + LYS):3
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    250
Absorption 0.1% (=1 g/l)    0.078,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.000

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 50.85

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.03, 13.79, 20.69]

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:114.138
Grand average of hydropathicity (GRAVY):0.52