Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4918
Number of amino acids:423
Molecular Weight:44151.64 Da
Theoretical pI:4.98


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)327.57%
Cysteine CYS (C)184.26%
Glutamic Acid GLU (E)102.36%
Aspartic Acid ASP (D)194.49%
Glycine GLY (G)307.09%
Phynylalanine PHE (F)133.07%
Isoleucine ILE (I)286.62%
Histidine HIS (H)30.71%
Lysine LYS (K)143.31%
Methionine MET (M)102.36%
Leucine LEU (L)4510.64%
Asparagine ASN (N)194.49%
Glutamine GLN (Q)92.13%
Proline PRO (P)368.51%
Serine SER (S)6214.66%
Arginine ARG (R)81.89%
Threonine THR (T)276.38%
Tryptophan TRP (W)00%
Valine VAL (V)255.91%
Tyrosine TYR (Y)153.55%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1946
HydrogenH3099
NitrogenN495
OxygenO614
SulphurS28

FormulaC1946H3099N495O614S28
Total Number of Atoms:6182


Total number of positively charged residues (ARG + LYS):22
Total number of negatively charged residues (ASP + GLU):29
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    23475
Absorption 0.1% (=1 g/l)    0.532,   assuming all pairs of CYS residues form cystines

Ext. coefficient    22350
Absorption 0.1% (=1 g/l)    0.506,   assuming all CYS residues are reduced
Aromaticity:0.066

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 47.62

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.79, 34.75, 22.93]

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:92.0095
Grand average of hydropathicity (GRAVY):0.24