Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5347
Number of amino acids:169
Molecular Weight:16816.46 Da
Theoretical pI:6.79


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2514.79%
Cysteine CYS (C)84.73%
Glutamic Acid GLU (E)42.37%
Aspartic Acid ASP (D)52.96%
Glycine GLY (G)137.69%
Phynylalanine PHE (F)74.14%
Isoleucine ILE (I)52.96%
Histidine HIS (H)10.59%
Lysine LYS (K)52.96%
Methionine MET (M)52.96%
Leucine LEU (L)1810.65%
Asparagine ASN (N)31.78%
Glutamine GLN (Q)00%
Proline PRO (P)127.1%
Serine SER (S)2816.57%
Arginine ARG (R)42.37%
Threonine THR (T)105.92%
Tryptophan TRP (W)00%
Valine VAL (V)148.28%
Tyrosine TYR (Y)21.18%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC735
HydrogenH1191
NitrogenN191
OxygenO231
SulphurS13

FormulaC735H1191N191O231S13
Total Number of Atoms:2361


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):9
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)    0.207,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.177,   assuming all CYS residues are reduced
Aromaticity:0.053

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 46.57

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.22, 33.14, 30.77]

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:91.8935
Grand average of hydropathicity (GRAVY):0.62