Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5806
Number of amino acids:170
Molecular Weight:18217.7 Da
Theoretical pI:4.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1911.18%
Cysteine CYS (C)95.29%
Glutamic Acid GLU (E)74.12%
Aspartic Acid ASP (D)1911.18%
Glycine GLY (G)105.88%
Phynylalanine PHE (F)31.76%
Isoleucine ILE (I)74.12%
Histidine HIS (H)21.18%
Lysine LYS (K)74.12%
Methionine MET (M)10.59%
Leucine LEU (L)1710%
Asparagine ASN (N)42.35%
Glutamine GLN (Q)52.94%
Proline PRO (P)95.29%
Serine SER (S)74.12%
Arginine ARG (R)95.29%
Threonine THR (T)127.06%
Tryptophan TRP (W)00%
Valine VAL (V)1810.59%
Tyrosine TYR (Y)52.94%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC789
HydrogenH1275
NitrogenN217
OxygenO256
SulphurS10

FormulaC789H1275N217O256S10
Total Number of Atoms:2547


Total number of positively charged residues (ARG + LYS):16
Total number of negatively charged residues (ASP + GLU):26
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    7950
Absorption 0.1% (=1 g/l)    0.436,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.409,   assuming all CYS residues are reduced
Aromaticity:0.047

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.20

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.41, 17.65, 25.88]

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:96.9411
Grand average of hydropathicity (GRAVY):0.02