SIR2/YDL042C 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] 29 5.2%
Arg[R] 19 3.4%
Asn[N] 35 6.2%
Asp[D] 34 6.0%
Cys[C] 11 2.0%
Gln[Q] 17 3.0%
Glu[E] 26 4.6%
Gly[G] 27 4.8%
His[H] 17 3.0%
Ile[I] 41 7.3%
Leu[L] 53 9.4%
Lys[K] 49 8.7%
Met[M] 13 2.3%
Phe[F] 22 3.9%
Pro[P] 35 6.2%
Ser[S] 42 7.5%
Thr[T] 30 5.3%
Trp[W] 3 0.5%
Tyr[Y] 22 3.9%
Val[V] 37 6.6%
Total Length 562

Instability index
Instability index (II) 38.79
This classifies the protein as stable

Atomic composition
Carbon 2839
Hydrogen 4491
Nitrogen 757
Oxygen 829
Sulfur 24
Total number of atoms 8940
Formula = C2839H4491N757O829S24

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 49905 M-1 cm-1
assuming NO Cys residues appear as half cystines 49280 M-1 cm-1
assuming all Cys residues are reduced 49280 M-1 cm-1
assuming all pairs of Cys residues form cystines 49905 M-1 cm-1

Aliphatic index
Aliphatic index 89.48

Coding Region Translation Calculations
Codon Bias 0.062
Codon Adaptation Index 0.148
Frequency of Optimal Codons 0.451
Hydropathicity of Protein -0.300
Aromaticity Score 0.084