Characterization of maturation-activated histone H1 and ribosomal S6 kinases in sea star oocytes - PubMed (original) (raw)
. 1987 Dec 1;26(24):7960-8.
doi: 10.1021/bi00398a062.
Affiliations
- PMID: 2827765
- DOI: 10.1021/bi00398a062
Characterization of maturation-activated histone H1 and ribosomal S6 kinases in sea star oocytes
S L Pelech et al. Biochemistry. 1987.
Abstract
DEAE-Sephacel chromatography of cytosolic extracts from sea star oocytes resolved at least two distinct peaks of maturation-activated protein kinase activity, each of which catalyzed the phosphorylation of histone H1, ribosomal protein S6, and Arg-Arg-Leu-Ser-Ser-Leu-Arg-Ala (RRLSSLRA), a synthetic peptide based on the sequence of a phosphorylation site in the latter protein. The first peak (elution conductivity approximately equal to 6 mmho) contained the major activated kinase with respect to the phosphorylation of histone H1, and the second peak (elution conductivity approximately equal to 10.5 mmho) contained the major activated kinase with respect to the phosphorylation of S6 and RRLSSLRA. These kinase activities were barely detectable in extracts from immature oocytes. The major stimulated histone H1 kinase exhibited an apparent Mr of approximately 90 000 on Sephacryl S-300 but eluted from TSK-400 with an apparent Mr of approximately 10 000. After DEAE-Sephacel fractionation, this kinase was shown to utilize both ATP (apparent Km approximately equal to 45 microM) and GTP (apparent Km approximately equal to 10 microM), although the Vmax was 8-fold higher with ATP than with GTP. The enzyme phosphorylated histone H1 with an apparent Km approximately equal to 50 micrograms/mL. Its properties resembled those of the growth-associated histone kinase. The major stimulated RRLSSLRA kinase had an apparent Mr of approximately 84 000 on Sephacryl S-300 and approximately 40 000 on TSK-400. After DEAE-Sephacel chromatography, this kinase selectively utilized ATP (apparent Km approximately equal to 25 microM).(ABSTRACT TRUNCATED AT 250 WORDS)
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