Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2550
Number of amino acids:45
Molecular Weight:4989.63 Da
Theoretical pI:8.8


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)12.22%
Cysteine CYS (C)1022.22%
Glutamic Acid GLU (E)12.22%
Aspartic Acid ASP (D)00%
Glycine GLY (G)715.56%
Phynylalanine PHE (F)24.44%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)12.22%
Asparagine ASN (N)511.11%
Glutamine GLN (Q)48.89%
Proline PRO (P)12.22%
Serine SER (S)24.44%
Arginine ARG (R)613.33%
Threonine THR (T)24.44%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)24.44%


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):6
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    3605
Absorption 0.1% (=1 g/l)    0.722,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.597,   assuming all CYS residues are reduced
Aromaticity:0.089

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 51.34

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[11.11, 33.33, 6.67]

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:10.8889
Grand average of hydropathicity (GRAVY):0.00