Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3871
Number of amino acids:93
Molecular Weight:9191.38 Da
Theoretical pI:9.3


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1617.2%
Cysteine CYS (C)88.6%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)22.15%
Glycine GLY (G)99.68%
Phynylalanine PHE (F)11.08%
Isoleucine ILE (I)55.38%
Histidine HIS (H)00%
Lysine LYS (K)22.15%
Methionine MET (M)00%
Leucine LEU (L)55.38%
Asparagine ASN (N)55.38%
Glutamine GLN (Q)22.15%
Proline PRO (P)33.23%
Serine SER (S)1617.2%
Arginine ARG (R)77.53%
Threonine THR (T)55.38%
Tryptophan TRP (W)00%
Valine VAL (V)55.38%
Tyrosine TYR (Y)22.15%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC377
HydrogenH631
NitrogenN123
OxygenO128
SulphurS8

FormulaC377H631N123O128S8
Total Number of Atoms:1267


Total number of positively charged residues (ARG + LYS):9
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    3480
Absorption 0.1% (=1 g/l)    0.379,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.324,   assuming all CYS residues are reduced
Aromaticity:0.032

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.49

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[19.35, 35.48, 22.58]

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:74.7311
Grand average of hydropathicity (GRAVY):0.17