Tissue distribution and evolution of fructosamine 3-kinase and fructosamine 3-kinase-related protein.
Fructosamine 3-kinase (FN3K) and FN3K-related protein (FN3K-RP) catalyze the phosphorylation of the Amadori products ribulosamines, psicosamines, and, in the case of FN3K, fructosamines. BLAST searches in chordate genomes revealed two genes encoding proteins homologous to FN3K or FN3K-RP in various mammals and in chicken but only one gene, encoding a protein more similar to FN3K-RP than to FN3K, in fishes and the sea squirt Ciona intestinalis. This suggests that a gene duplication event occurred after the fish radiation and that the FN3K gene evolved more rapidly than the FN3K-RP gene. In agreement with this distribution, only one enzyme, phosphorylating ribulosamines and psicosamines but not fructosamines, was found in the tissues from a fish (Clarias gariepinus), whereas two enzymes with specificities similar to either FN3K or FN3K-RP were found in mouse, rat, and chicken tissues. FN3K is particularly active in brain, heart, kidney, and skeletal muscle. Its activity is also relatively elevated in erythrocytes from man, rat, and mouse but barely detectable in erythrocytes from chicken and pig, which correlates well with the low intracellular concentration of glucose in erythrocytes from these species. This is in keeping with the specific role of FN3K to repair protein damage caused by glucose. FN3K-RP was more evenly distributed in tissues, except for skeletal muscle where its activity was particularly low. This may be related to low activity of the pentose phosphate pathway in this tissue, as suggested by assays of glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase. This finding, together with the high affinity of FN3K-RP for ribulosamines, suggests that this enzyme may serve to repair damage caused by the powerful glycating agent, ribose 5-phosphate.
Laboratory of Physiological Chemistry, Christian de Duve Institute of Cellular Pathology and Université Catholique de Louvain, Avenue Hippocrate 75, B-1200 Brussels, Belgium.
Jérôme
J
Delplanque
Ghislain
G
Delpierre
Fred R
FR
Opperdoes
Emile
E
Van Schaftingen
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000201:enzymology; D002645:Chickens; D002938:Ciona intestinalis; D019295:Computational Biology; D019992:Databases as Topic; D004912:Erythrocytes / Q000378:metabolism; D019143:Evolution, Molecular; D005399:Fishes; D016678:Genome; D005947:Glucose / Q000378:metabolism; D006801:Humans; D007668:Kidney / Q000201:enzymology; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D018482:Muscle, Skeletal / Q000201:enzymology; D009206:Myocardium / Q000201:enzymology; D010766:Phosphorylation; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000096:biosynthesis* / Q000235:genetics*; D010802:Phylogeny; D011487:Protein Conformation; D012313:RNA / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012267:Ribosemonophosphates / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D012984:Software; D013379:Substrate Specificity; D014018:Tissue Distribution
D012267:Ribosemonophosphates; C031626:ribose-5-phosphate; D012313:RNA; C479999:FN3KRP protein, human; D017853:Phosphotransferases (Alcohol Group Acceptor); C414347:fructosamine-3-kinase; D005947:Glucose