Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5585
Number of amino acids:227
Molecular Weight:22726.44 Da
Theoretical pI:5.77


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2310.13%
Cysteine CYS (C)3414.98%
Glutamic Acid GLU (E)73.08%
Aspartic Acid ASP (D)52.2%
Glycine GLY (G)4218.5%
Phynylalanine PHE (F)52.2%
Isoleucine ILE (I)52.2%
Histidine HIS (H)10.44%
Lysine LYS (K)73.08%
Methionine MET (M)73.08%
Leucine LEU (L)83.52%
Asparagine ASN (N)167.05%
Glutamine GLN (Q)146.17%
Proline PRO (P)52.2%
Serine SER (S)208.81%
Arginine ARG (R)41.76%
Threonine THR (T)93.96%
Tryptophan TRP (W)10.44%
Valine VAL (V)52.2%
Tyrosine TYR (Y)93.96%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC912
HydrogenH1419
NitrogenN279
OxygenO320
SulphurS41

FormulaC912H1419N279O320S41
Total Number of Atoms:2971


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):12
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    21035
Absorption 0.1% (=1 g/l)    0.926,   assuming all pairs of CYS residues form cystines

Ext. coefficient    18910
Absorption 0.1% (=1 g/l)    0.832,   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 : 28.89

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[14.54, 36.56, 19.82]

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:38.8546
Grand average of hydropathicity (GRAVY):-0.12