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H Kobayashi A Inoue T Mikawa H Kuwayama Y Hotta T Masaki S Ebashi 《Journal of biochemistry》1992,112(6):786-791
Two proteins with myosin light chain kinase activity and electrophoretic molecular weights of 155,000 and 130,000 were each isolated from bovine stomach smooth muscle [Kuwayama, H., Suzuki, M., Koga, R., & Ebashi, S. (1988) J. Biochem. 104, 862-866]. The 155 kDa component showed a much higher superprecipitation-inducing activity than the 130 kDa component, when compared on the basis of equivalent myosin light chain kinase activity. In this study, we isolated a cDNA for the entire coding region of the 155 kDa protein. The deduced amino acid sequence revealed a high degree of similarity to those of chicken and rabbit smooth muscle myosin light chain kinases. Multiple motifs, such as three repeats of an immunoglobulin C2-like domain, a fibronectin type III domain, and unusual 20 repeats of 12 amino acids were detected in the sequence. Part of the amino-terminal sequence was similar to that of the actin- and calmodulin-binding domain of smooth muscle caldesmon. These observations suggest that the 155 kDa protein has additional functions other than its enzymatic activity. Two mRNAs of 6.0 and 2.6 kb in length in the bovine stomach smooth muscle RNAs were hybridized with cDNA probes. The 2.6-kb RNA probably encodes telokin, which is the carboxyl terminus of smooth muscle myosin light chain kinase. mRNAs with identical lengths were also detected in bovine aorta. 相似文献
3.
Hiroshi Yao Hiroaki Ooboshi Seizo Sadoshima Kentaro Takano Setsuro Ibayashi Masatoshi Fujishima 《Neurochemical research》1990,15(5):547-549
To determine the level of cerebral blood flow reduction which causes striatal dopamine release, extracellular dopamine and cerebral blood flow was simultaneously determined using in vivo brain dialysis and a hydrogen clearance method, respectively, in the striatum of spontaneously hypertensive rats, before and during experimental cerebral ischemia. The ischemic flow threshold for neurotransmitter dopamine release was found to be 20% of the resting value or 8–10 ml/100g/min of cerebral blood flow, being similar to those for energy and membrane failures. 相似文献
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Localization of 6S component of a alpha-actinin at Z-band 总被引:29,自引:0,他引:29
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Sea urchin protease specific to the SPKK motif in histone 总被引:1,自引:0,他引:1
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Sperm entry into the oocyte of the starfish, Asterina pectinifera, was prevented when the membrane potential of the oocyte was held more positive than −10 to −5 mV, and multiple sperm entries were induced when the potential was held more negative. Based on this potential-dependent fertilization block mechanism, it was demonstrated that an activation potential (AVP) which is induced immediately after the attachment of the first sperm to the egg surface plays the role of a fast polyspermy block. The AVP-mediated polyspermy block mechanism develops as the oocyte matures and deteriorates as it ages. AVPs of mature oocytes exceeded −5 mV (the critical potential level for fertilization block) within 1 sec, and the potential stayed at +12 mV even after the initiation of fertilization membrane elevation. Consequently, the entry of a second sperm is prevented. In contrast, AVPs of overripe oocytes took about 15 sec to attain −5 mV, or they did not attain −5 mV at all. In overripe oocytes multiple sperm entries were associated with “step depolarization(s)” in the rising phase of the AVPs before membrane elevation took place. Immature oocytes generated AVPs associated with sperm entries, but without membrane elevation. AVPs in immature oocytes were characterized by the step depolarization(s) in the rising phase, and an AVP could be evoked again by a second insemination 20 min after the first insemination. These findings indicate that immature oocytes lack both fast and slow polyspermy block mechanisms. 相似文献
8.
H Sugino N Sakabe K Sakabe S Hatano F Oosawa T Mikawa S Ebashi 《Journal of biochemistry》1979,86(1):257-260
Smooth muscle G-actin from chicken gizzard and Physarum plasmodium G-actin both interact with DNase I and form 1 : 1 complexes. These complexes were crystallized by using polyethylene glycol 6000 as a precipitant. Both crystals belong to the same orthorhombic space group P2(1)2(1)2(1). The cell dimensions of chicken gizzard G-actin.DNase I complex are a=42.00 +/- 0.07 A, b=225.3 +/- 0.4 A, and c=77.4 +/- 0.1 A, while those of Physarum G-actin.DNase I complex are a=42 A, b=221 A, and c=77 A. 相似文献
9.
Fumio Ibuki Akiji Aoki Setsuro Matsushita 《Bioscience, biotechnology, and biochemistry》2013,77(4):316-318
The volume of carbon dioxide evolved in a shaking apparatus was measured at fixed intervals, and it was confirmed that the fermentation of dry yeast generally depends on three factors and that they are represented with an initial fermenting activity, a power which recovers fermenting activity, and a maximum fermenting activity. This expression of fermenting power was compared with usual expressions and it was proved to be more reasonable, particularly, for deciding the initial fermenting activity. 相似文献
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