Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2858
Number of amino acids:29
Molecular Weight:3109.73 Da
Theoretical pI:7.74


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)620.69%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)310.34%
Glycine GLY (G)413.79%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)13.45%
Histidine HIS (H)00%
Lysine LYS (K)310.34%
Methionine MET (M)13.45%
Leucine LEU (L)413.79%
Asparagine ASN (N)13.45%
Glutamine GLN (Q)00%
Proline PRO (P)13.45%
Serine SER (S)13.45%
Arginine ARG (R)13.45%
Threonine THR (T)13.45%
Tryptophan TRP (W)00%
Valine VAL (V)13.45%
Tyrosine TYR (Y)13.45%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC127
HydrogenH214
NitrogenN36
OxygenO40
SulphurS7

FormulaC127H214N36O40S7
Total Number of Atoms:424


Total number of positively charged residues (ARG + LYS):4
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    1865
Absorption 0.1% (=1 g/l)    0.600,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.479,   assuming all CYS residues are reduced
Aromaticity:0.034

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 22.58

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.14, 24.14, 17.24]

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:77.2414
Grand average of hydropathicity (GRAVY):0.16