Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5382
Number of amino acids:227
Molecular Weight:24779.47 Da
Theoretical pI:6.25


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)114.85%
Cysteine CYS (C)52.2%
Glutamic Acid GLU (E)125.29%
Aspartic Acid ASP (D)93.96%
Glycine GLY (G)198.37%
Phynylalanine PHE (F)167.05%
Isoleucine ILE (I)93.96%
Histidine HIS (H)83.52%
Lysine LYS (K)146.17%
Methionine MET (M)73.08%
Leucine LEU (L)208.81%
Asparagine ASN (N)156.61%
Glutamine GLN (Q)52.2%
Proline PRO (P)177.49%
Serine SER (S)156.61%
Arginine ARG (R)41.76%
Threonine THR (T)156.61%
Tryptophan TRP (W)00%
Valine VAL (V)219.25%
Tyrosine TYR (Y)52.2%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1116
HydrogenH1729
NitrogenN289
OxygenO325
SulphurS12

FormulaC1116H1729N289O325S12
Total Number of Atoms:3471


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):21
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    7700
Absorption 0.1% (=1 g/l)    0.311,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.301,   assuming all CYS residues are reduced
Aromaticity:0.093

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 23.75

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.28, 29.07, 22.03]

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:81.4978
Grand average of hydropathicity (GRAVY):-0.05