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991.
Ubiquitin was purified from pea (Pisum sativum L.) and its antibodywas produced. Western blot analysis showed that the antibodycross-reacted with ubiquitins from a green alga Chlamydomonasreinhardtii, a brown alga Laminaria angustata and a red algaPorphyridium cruentum but not with ubiquitin from a blue-greenalga Synechococcus sp. In Chlamydomonas, the antibody also reactedwith some ubiquitinated proteins including 28- and 31-kDa polypeptides.The isoelectric points of Chlamydomonas ubiquitin and the 28-and 31-kDa ubiquitinated proteins were 8.0, 8.9 and 10.3, respectively.The ubiquitinated proteins, including the 28- and 31-kDa polypeptideswere detected after in vitro ATP-dependent ubiquitination ofChlamydomonas cell extract with l25I-labeled bovine ubiquitin.Heat treatment of Chlamydomonas cells (>40°C) causeddrastic increase of ubiquitinated proteins with high mol wt(>60kDa), and coordinated redistribution or decrease of otherubiquitinated proteins and free ubiquitin. Quantitative analysisrevealed that the 28- and 31-kDa ubiquitinated proteins showeddifferent responses against heat stress, i.e. the former beingmore sensitive than the latter. (Received July 10, 1988; Accepted October 4, 1988) 相似文献
992.
993.
Taguchi Tomohiko; Muto Yutaka; Kitajima Ken; Yokoyama Shigeyuki; Inoue Sadako; Inoue Yasuo 《Glycobiology》1997,7(1):31-36
The chemical shifts of ring protons of the ß-Man residuein a triantennary complex type N-linked glycan chain havinga GlcNAcß1 相似文献
994.
Of 8 compounds tested as additives, trehalose at 100 mM was the most effective for the preparation of lyophilized pyrroloquinoline quinone glucose dehydrogenase (PQQGDH). Lyophilized PQQGDH retained about 80% of initial activity after 1 h at 80°C and can be stored at 28°C for more than a month without any significant decrease in enzymatic activity. It is thus suitable for use as a biosensor component. 相似文献
995.
Ichthyological Research - Plectranthias kojii sp. nov. (Perciformes: Serranidae) is described from a single specimen [49.4 mm in standard length (SL)] collected from 150 m depth off Hamahiga-jima... 相似文献
996.
Jae-Hong Kim Yeojin Seo Myungjin Jo Hyejin Jeon Young-Seop Kim Eun-Jung Kim Donggun Seo Won-Ha Lee Sang Ryong Kim Nozomu Yachie Quan Zhong Marc Vidal Frederick P. Roth Kyoungho Suk 《The Journal of biological chemistry》2020,295(50):16906
Kinases are critical components of intracellular signaling pathways and have been extensively investigated with regard to their roles in cancer. p21-activated kinase-1 (PAK1) is a serine/threonine kinase that has been previously implicated in numerous biological processes, such as cell migration, cell cycle progression, cell motility, invasion, and angiogenesis, in glioma and other cancers. However, the signaling network linked to PAK1 is not fully defined. We previously reported a large-scale yeast genetic interaction screen using toxicity as a readout to identify candidate PAK1 genetic interactions. En masse transformation of the PAK1 gene into 4,653 homozygous diploid Saccharomyces cerevisiae yeast deletion mutants identified ∼400 candidates that suppressed yeast toxicity. Here we selected 19 candidate PAK1 genetic interactions that had human orthologs and were expressed in glioma for further examination in mammalian cells, brain slice cultures, and orthotopic glioma models. RNAi and pharmacological inhibition of potential PAK1 interactors confirmed that DPP4, KIF11, mTOR, PKM2, SGPP1, TTK, and YWHAE regulate PAK1-induced cell migration and revealed the importance of genes related to the mitotic spindle, proteolysis, autophagy, and metabolism in PAK1-mediated glioma cell migration, drug resistance, and proliferation. AKT1 was further identified as a downstream mediator of the PAK1-TTK genetic interaction. Taken together, these data provide a global view of PAK1-mediated signal transduction pathways and point to potential new drug targets for glioma therapy. 相似文献
997.
Two types of Chlamydomonas flagellar mutants missing different components of inner-arm dynein 总被引:14,自引:10,他引:4
Two types of Chlamydomonas reinhardtii flagellar mutants (idaA and idaB) lacking partial components of the inner-arm dynein were isolated by screening mutations that produce paralyzed phenotypes when present in a mutant missing outer-arm dynein. Of the currently identified three inner-arm subspecies I1, I2, and I3, each containing two heterologous heavy chains (Piperno, G., Z. Ramanis, E. F. Smith, and W. S. Sale. 1990. J. Cell Biol. 110:379-389), idaA and idaB lacked I1 and I2, respectively. The 13 idA isolates comprised three genetically different groups (ida1, ida2, ida3) and the two idaB isolates comprised a single group (ida4). In averaged cross-section electron micrographs, inner dynein arms in wild-type axonemes appeared to have two projections pointing to discrete directions. In ida1-3 and ida4 axonemes, on the other hand, either one of them was missing or greatly diminished. Both projections were weak in the double mutant ida1-3 x ida4. These observations suggest that the inner dynein arms in Chlamydomonas axonemes are aligned not in a single straight row, but in a staggered row or two discrete rows. Both ida1-3 and ida4 swam at reduced speed. Thus, the inner-arm subspecies missing in these mutants are not necessary for flagellar motility. However, the double mutants ida1-3 x ida4 were nonmotile, suggesting that axonemes with significant defects in inner arms cannot function. The inner-arm dynein should be important for the generation of axonemal beating. 相似文献
998.
S Kudo Y Muto M Inagaki H Hidaka Y Nozawa 《Comparative biochemistry and physiology. B, Comparative biochemistry》1985,80(3):495-498
Addition of bovine brain calmodulin and S-100 inhibited Tetrahymena calmodulin-induced stimulation of guanylate cyclase, but they did not affect enzymatic activity in the presence of calcium alone. Troponin C shows little effect on the cyclase activity regardless of the presence or absence of Tetrahymena calmodulin. The inhibitory effects of brain calmodulin and S-100 were overcome by the addition of Tetrahymena calmodulin, but not by calcium. Both calmodulins from Tetrahymena and bovine brain elicited stimulation of heart phosphodiesterase, while troponin C and S-100 did not affect the phosphodiesterase activity in the presence and absence of Tetrahymena calmodulin. 相似文献
999.
1000.
Cellular distribution and subunit constitution of carbonic anhydrase(CA) were compared between the CBSC strain of Chlamydomonasreinhardtii (purchased from Carolina Biological Suuply Co.)and C. reinhardtii C-9. CAs existed exclusively outside theplasma membrane inboth strains. Mol wts of the monomer and theholoenzyme from both strains were 35 kDa and 115117 kDa,respectively. These results show that the CAs of both strainsare identical or verysimilar.
1Present address: National Institute for Basic Biology, Myodaiji,Okazaki 444, Japan. (Received June 29, 1987; Accepted October 9, 1987) 相似文献