Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2548
Number of amino acids:45
Molecular Weight:4647.06 Da
Theoretical pI:6.29


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)36.67%
Cysteine CYS (C)817.78%
Glutamic Acid GLU (E)12.22%
Aspartic Acid ASP (D)00%
Glycine GLY (G)715.56%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)12.22%
Asparagine ASN (N)36.67%
Glutamine GLN (Q)613.33%
Proline PRO (P)12.22%
Serine SER (S)613.33%
Arginine ARG (R)24.44%
Threonine THR (T)36.67%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)36.67%


Atomic Composition:


As there is at least one ambiguous position (B, J, X or Z) in the sequence considered, the atomic composition cannot be computed.


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):1
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    4970
Absorption 0.1% (=1 g/l)    1.069,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.962,   assuming all CYS residues are reduced
Aromaticity:0.067

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 66.95

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[8.89, 37.78, 11.11]

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:15.3333
Grand average of hydropathicity (GRAVY):0.00