Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5516
Number of amino acids:220
Molecular Weight:23550.15 Da
Theoretical pI:8.95


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)219.55%
Cysteine CYS (C)31.36%
Glutamic Acid GLU (E)83.64%
Aspartic Acid ASP (D)104.55%
Glycine GLY (G)177.73%
Phynylalanine PHE (F)177.73%
Isoleucine ILE (I)156.82%
Histidine HIS (H)41.82%
Lysine LYS (K)177.73%
Methionine MET (M)10.45%
Leucine LEU (L)177.73%
Asparagine ASN (N)125.45%
Glutamine GLN (Q)52.27%
Proline PRO (P)135.91%
Serine SER (S)125.45%
Arginine ARG (R)52.27%
Threonine THR (T)219.55%
Tryptophan TRP (W)00%
Valine VAL (V)198.64%
Tyrosine TYR (Y)31.36%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1072
HydrogenH1693
NitrogenN277
OxygenO310
SulphurS4

FormulaC1072H1693N277O310S4
Total Number of Atoms:3356


Total number of positively charged residues (ARG + LYS):22
Total number of negatively charged residues (ASP + GLU):18
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    4595
Absorption 0.1% (=1 g/l)    0.195,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.190,   assuming all CYS residues are reduced
Aromaticity:0.091

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 21.75

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.27, 24.55, 21.36]

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:91.3181
Grand average of hydropathicity (GRAVY):0.12