Abstract
The preparation and purification of cyanogen bromide fragments from [(14)C]carboxymethylated coelacanth triose phosphate isomerase is presented. The automated sequencing of these fragments, the lysine-blocked tryptic peptides derived from them, and also of the intact protein, is described. Combination with results from manual sequence analysis has given the 247-residue amino acid sequence of coelacanth triose phosphate isomerase in 4 months, by using 100mg of enzyme. (Two small adjacent peptides were placed by homology with the rabbit enzyme.) Comparison of this sequence with that of the rabbit muscle enzyme shows that 207 (84%) of the residues are identical. This slow rate of evolutionary change (corresponding to two amino acid substitutions per 100 residues per 100 million years) is similar to that found for glyceraldehyde 3-phosphate dehydrogenase. The reliability of sequence information obtained by automated methods is discussed.
MeSH Terms
Amino Acid Sequence
Amino Acids/analysis
Animals
Biological Evolution
Carbohydrate Epimerases/analysis
Carbon Radioisotopes
Chromatography, DEAE-Cellulose
Chromatography, Gel
Cyanogen Bromide
Electrophoresis, Polyacrylamide Gel
Evaluation Studies as Topic
Fishes
Glyceraldehyde-3-Phosphate Dehydrogenases
Iodoacetates
Methods
Microchemistry
Muscles
Organophosphorus Compounds
Peptide Fragments/analysis
Rabbits
Species Specificity
Spectrophotometry, Ultraviolet
Thermolysin
Trioses
Trypsin
Chemicals
Amino Acids
Carbon Radioisotopes
Iodoacetates
Organophosphorus Compounds
Peptide Fragments
Trioses
Glyceraldehyde-3-Phosphate Dehydrogenases
Trypsin
Thermolysin
Carbohydrate Epimerases
Cyanogen Bromide
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Kolb E
Harris J I
Bridgen J
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29 references, click to expand
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