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Titolo:
Changes in the activities of protein phosphatase type 1 and type 2A in seaurchin embryos during early development
Autore:
Kawamoto, M; Fujiwara, A; Yasumasu, I;
Indirizzi:
Waseda Univ, Sch Educ, Dept Biol, Shinjuku Ku, Tokyo 1690051, Japan WasedaUniv Tokyo Japan 1690051 Biol, Shinjuku Ku, Tokyo 1690051, Japan
Titolo Testata:
DEVELOPMENT GROWTH & DIFFERENTIATION
fascicolo: 4, volume: 42, anno: 2000,
pagine: 395 - 405
SICI:
0012-1592(200008)42:4<395:CITAOP>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
OKADAIC ACID; KINASE-C; CALYCULIN-A; EGGS; PHOSPHORYLATION; INHIBITORS; FERTILIZATION; PURIFICATION; ACTIVATION; APPARATUS;
Keywords:
development; nucleus; okadaic acid; protein kinase; protein phosphatase; sea urchin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Kawamoto, M Waseda Univ, Sch Educ, Dept Biol, Shinjuku Ku, 1-6-1 Nishiwaseda, Tokyo 1690051, Japan Waseda Univ 1-6-1 Nishiwaseda Tokyo Japan 16900510051, Japan
Citazione:
M. Kawamoto et al., "Changes in the activities of protein phosphatase type 1 and type 2A in seaurchin embryos during early development", DEVELOP GR, 42(4), 2000, pp. 395-405

Abstract

In the eggs and embryos of sea urchins, the activity of protein phosphatase type 2A (PP2A) increased during the developmental period between fertilization and the morula stage, decreased after the prehatching blastula stage and increased again after hatching. The PP2A activity changed keeping pace with alteration to the activities of cAMP-dependent protein kinase (A kinase), Ca2+/calmodulin-dependent protein kinase (CaM kinase) and casein kinase. Probably, PP2A contributes to the quick turning off of cellular signals because of protein phosphorylation. The activity of protein phosphatase type1 (PP1) was not detectable up to the morula stage and appreciably increased thereafter. In the isolated nucleus fraction, specific activities of PP1 and PP2A were higher than in whole embryos at all stages in early development. Exponential increase in the number of nuclei because of egg cleavage probably makes PP1 activity detectable in whole embryos after the morula stage. In isolated nuclei, the activities of PP1 and PP2A appreciably decreasedafter hatching, whereas the activities of A kinase, Ca2+/phospholipid-dependent protein kinase (C kinase) and CaM kinase, as well as casein kinase, became higher. In nuclei, cellular signals caused by protein phosphorylationafter hatching do not seem to be turned off by these protein kinases so quickly as before hatching. The PP1 and PP2A in nuclei also seem to contribute to the elimination of signal noise.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/05/20 alle ore 13:32:58