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Titolo:
THE DISTRIBUTION OF CARBONIC-ANHYDRASE TYPE-I AND TYPE-II ISOZYMES INLAMPREY AND TROUT - POSSIBLE COEVOLUTION WITH ERYTHROCYTE CHLORIDE BICARBONATE EXCHANGE
Autore:
HENRY RP; TUFTS BL; BOUTILIER RG;
Indirizzi:
AUBURN UNIV,DEPT ZOOL,101 CARY HALL AUBURN AL 36849 AUBURN UNIV,ALABAMA AGR EXPT STN AUBURN AL 36849 QUEENS UNIV,DEPT BIOL KINGSTON K71 3N6 ON CANADA UNIV CAMBRIDGE,DEPT ZOOL CAMBRIDGE CB2 3EJ ENGLAND
Titolo Testata:
Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology
fascicolo: 5, volume: 163, anno: 1993,
pagine: 380 - 388
SICI:
0174-1578(1993)163:5<380:TDOCTA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PETROMYZON-MARINUS; CALLINECTES-SAPIDUS; GAS-TRANSPORT; BLUE-CRAB; BLOOD; LUNG; LOCALIZATION; EXCRETION; DIOXIDE; GILL;
Keywords:
CARBONIC ANHYDRASE; CL/HCO3 EXCHANGE; RED BLOOD CELLS; LAMPREY, PETROMYZON; TROUT, ONCORHYNCHUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
R.P. Henry et al., "THE DISTRIBUTION OF CARBONIC-ANHYDRASE TYPE-I AND TYPE-II ISOZYMES INLAMPREY AND TROUT - POSSIBLE COEVOLUTION WITH ERYTHROCYTE CHLORIDE BICARBONATE EXCHANGE", Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 163(5), 1993, pp. 380-388

Abstract

The subcellular distribution and kinetic properties of carbonic anhydrase were examined in red blood cells and gills of the lamprey, Petromyzon marinus, a primitive agnathan, and rainbow trout, Oncorhynchus mykiss, a modern teleost, in relation to the evolution of rapid Cl-/HCO3- exchange in the membrane of red blood cells. In the lamprey, which either lacks or has minimal red cell Cl-/HCO3- exchange, there has beenno compensatory incorporation of carbonic anhydrase into the membranefraction of either the red cell or the gill. Carbonic anhydrase activity in red cells is exclusively cytoplasmic, and the single isozyme displays kinetic properties typical of the type I, slow turnover, isozyme. In the red blood cells of the trout, however, which possess high amounts of the band-3 Cl-/HCO3- exchange protein, the single carbonic anhydrase isozyme appears to be kinetically similar to the type II, fastturnover, isozyme. It thus appears that the type I isozyme present inthe red blood cells of primitive aquatic vertebrates was replaced in modern teleosts by the kinetically more efficient type II isozyme onlyafter the incorporation and expression of a significant amount of theband-3 exchange protein in the membrane of the red cell.

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Documento generato il 09/07/20 alle ore 17:15:27