SIR4/YDR227W Additional Physico-chemical Properties Help

Physico-chemical properties were determined using the ProtParam tool available through ExPASy to analyze the primary protein sequence for atomic composition, extinction coefficient, estimated half-life, instability index and aliphatic index. Transcript translation calculations were determined using CodonW.


A.A. Composition
Ala[A] 59 4.3%
Arg[R] 48 3.5%
Asn[N] 100 7.4%
Asp[D] 77 5.7%
Cys[C] 5 0.4%
Gln[Q] 57 4.2%
Glu[E] 108 8.0%
Gly[G] 39 2.9%
His[H] 26 1.9%
Ile[I] 89 6.6%
Leu[L] 92 6.8%
Lys[K] 158 11.6%
Met[M] 20 1.5%
Phe[F] 37 2.7%
Pro[P] 77 5.7%
Ser[S] 174 12.8%
Thr[T] 98 7.2%
Trp[W] 6 0.4%
Tyr[Y] 21 1.5%
Val[V] 67 4.9%
Total Length 1358

Instability index
Instability index (II) 46.85
This classifies the protein as unstable

Atomic composition
Carbon 6603
Hydrogen 10741
Nitrogen 1875
Oxygen 2179
Sulfur 25
Total number of atoms 21423
Formula = C6603H10741N1875O2179S25

Estimated half-life
Escherichia coli (in vivo) >10 hours
mammalian reticulocytes (in vitro) 30 hours
yeast (in vivo) >20 hours

Extinction Coefficients at 280 nm
assuming ALL Cys residues appear as half cystines 64540 M-1 cm-1
assuming NO Cys residues appear as half cystines 64290 M-1 cm-1
assuming all Cys residues are reduced 64290 M-1 cm-1
assuming all pairs of Cys residues form cystines 64540 M-1 cm-1

Aliphatic index
Aliphatic index 70.63

Coding Region Translation Calculations
Codon Bias 0.014
Codon Adaptation Index 0.136
Frequency of Optimal Codons 0.429
Hydropathicity of Protein -0.884
Aromaticity Score 0.047