Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4641
Number of amino acids:320
Molecular Weight:35012.48 Da
Theoretical pI:9.17


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)247.5%
Cysteine CYS (C)41.25%
Glutamic Acid GLU (E)195.94%
Aspartic Acid ASP (D)82.5%
Glycine GLY (G)237.19%
Phynylalanine PHE (F)154.69%
Isoleucine ILE (I)3410.63%
Histidine HIS (H)30.94%
Lysine LYS (K)278.44%
Methionine MET (M)30.94%
Leucine LEU (L)257.81%
Asparagine ASN (N)257.81%
Glutamine GLN (Q)185.63%
Proline PRO (P)216.56%
Serine SER (S)216.56%
Arginine ARG (R)82.5%
Threonine THR (T)123.75%
Tryptophan TRP (W)00%
Valine VAL (V)216.56%
Tyrosine TYR (Y)92.81%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1581
HydrogenH2536
NitrogenN420
OxygenO460
SulphurS7

FormulaC1581H2536N420O460S7
Total Number of Atoms:5004


Total number of positively charged residues (ARG + LYS):35
Total number of negatively charged residues (ASP + GLU):27
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    13660
Absorption 0.1% (=1 g/l)    0.390,   assuming all pairs of CYS residues form cystines

Ext. coefficient    13410
Absorption 0.1% (=1 g/l)    0.383,   assuming all CYS residues are reduced
Aromaticity:0.075

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.40

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.50, 28.12, 22.19]

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:98.4375
Grand average of hydropathicity (GRAVY):-0.12