Abstract：
:The taxa-4(20),11(12)-dien-5alpha-ol-O-acetyl transferase which catalyzes the third step of Taxol biosynthesis has been isolated from methyl jasmonate-induced Taxus cells, and partially purified and characterized (K. Walker, R. E. B. Ketchum, M. Hezari, D. Gatfield, M. Golenowski, A. Barthol, and R. Croteau, Arch. Biochem. Biophys. 364, 273-279 1999). A revised purification method allowed internal amino acid microsequencing of the enzyme, from which primers were designed and employed to amplify a transacetylase gene-specific fragment. This radiolabeled, 900-bp amplicon was used as a hybridization probe to screen a cDNA library constructed from poly(A)(+) RNA isolated from induced Taxus cells, from which a full-length transacetylase sequence was obtained. Expression of this clone from pCWori(+) in Escherichia coli JM109 cells yielded the functional enzyme, as determined by radiochemical assay and combined capillary gas chromatographic-mass spectrometric verification of the acetylated product. The full-length DNA has an open-reading frame of 1317 nucleotides corresponding to a deduced amino acid sequence of 439 residues that exhibits high sequence identity to the proteolytic fragments of the native enzyme, which the recombinant transacetylase resembles in properties. Consistent with the size of the operationally soluble native enzyme, the DNA appears to encode a monomeric protein of molecular weight 49,079 that bears no N-terminal organellar targeting information. Sequence comparison of the taxadien-5alpha-ol-O-acetyl transferase with the few other known acyl transferases of plant origin indicates a significant degree of similarity between these enzymes (64-67%). The efficient conversion of taxadien-5alpha-yl acetate to further hydroxylated intermediates of the Taxol pathway confirms the significance of this acylation step and suggests this taxadienol transacetylase to be an important target for genetic manipulation to improve Taxol production.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Walker K,Schoendorf A,Croteau Rdoi
10.1006/abbi.1999.1609subject
Has Abstractpub_date
2000-02-15 00:00:00pages
371-80issue
2eissn
0003-9861issn
1096-0384pii
S0003-9861(99)91609-0journal_volume
374pub_type
杂志文章abstract：:The F1 moiety of the rat liver mitochondrial ATP synthase/ATPase complex contains as isolated 2 mol Mg2+/mol F1, 1 mol of which is nonexchangeable and the other which is exchangeable (N. Williams, J. Hullihen, and P.L. Pedersen, (1987) Biochemistry 26, 162-169). In addition, the enzyme binds 1 mol ADP/mol F1 and 3 mol...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(89)90571-7
更新日期：1989-01-01 00:00:00
abstract：:L-Tryptophan is an essential amino acid for mammals. It is utilized not only for protein synthesis but also for the biosynthesis of serotonin and melatonin by the serotonin pathway as well as nicotinamide adenine dinucleotide by the kynurenine pathway. Although the kynurenine pathway is responsible for the catabolism ...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章,评审
doi：10.1016/j.abb.2013.11.009
更新日期：2014-02-15 00:00:00
abstract：:Although life as we know it evolved in an aqueous medium, the properties of water are not completely understood. In this review, we focus on the role of water in guiding protein folding and stability. Specifically, we discuss the mechanisms of protein folding in an aqueous environment, the effects of water on the fold...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2007.07.007
更新日期：2008-01-01 00:00:00
abstract：:Metallothionein isoform II was purified from calf liver. The protein had a metal content of 1.2-1.9 Cu ions and 5.6-6.2 Zn ions per molecule in different preparations. The complete amino acid sequence of the molecule was determined by automatic Edman degradation of CNBr and tryptic peptides of the carboxymethylated pr...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(86)90212-2
更新日期：1986-02-15 00:00:00
abstract：:We previously showed that iron chelated to the Pseudomonas aeruginosa siderophore pyochelin enhances oxidant-mediated injury to pulmonary artery endothelial cells by catalyzing hydroxyl radical (HO(*)) formation. Therefore, we examined pyochelin structural/chemical features that may be important in this process. Five ...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.2001.2517
更新日期：2001-09-15 00:00:00
abstract：:The mammalian aldehyde dehydrogenase-3 gene (ALDH3) exhibits several aspects of tissue-specific expression. Certain normal tissues, such as the cornea, constitutively express ALDH3 at very high levels. Other tissues, such as normal liver, do not express ALDH3. In liver, ALDH3 is inducible by polycyclic aromatic hydroc...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1998.0989
更新日期：1999-01-15 00:00:00
abstract：:The roles of p67-deglycosylase (p67-DG) in the regulation of protein synthesis in baculovirus-infected insect cells were studied. Like vaccinia viral infection, baculovirus infection of insect cells also induced the appearance of a p67-DG. However, p67-DG activity could not be detected because these cells do not conta...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1997.0139
更新日期：1997-06-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(92)90471-8
更新日期：1992-11-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.2000.2195
更新日期：2001-02-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(87)90648-5
更新日期：1987-02-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2020.108588
更新日期：2020-10-30 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.2001.2375
更新日期：2001-06-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1999.1289
更新日期：1999-08-01 00:00:00
abstract：:The role of the conserved sequence motif 301DDLTDP306 in the F0F1 ATP synthase beta subunit was assessed by mutagenic analysis in the Escherichia coli enzyme. Mutations gave variable effects on F1 sector activity, stability, and membrane binding to the F0 sector. Upon solubilization, F1 sectors of the betaD302E and be...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1998.0856
更新日期：1998-10-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1996.0408
更新日期：1996-09-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(86)90587-4
更新日期：1986-06-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(88)90105-1
更新日期：1988-02-15 00:00:00
abstract：:The ionization of 4-nitroimidazole to 4-nitroimidazolate was investigated as a function of ionic strength. The apparent pKa varies from 8.99 to 9.50 between 0.001 and 1.0 M ionic strength, respectively, at 25 degrees C. The ionic strength dependence of this ionization is anomalous. The binding of 4-nitroimidazole by h...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.2000.2039
更新日期：2000-10-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
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更新日期：2018-07-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(84)90174-7
更新日期：1984-03-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1996.0380
更新日期：1996-09-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1999.1118
更新日期：1999-04-01 00:00:00
abstract：:The steady-state kinetic mechanism of vitamin K-dependent carboxylase from calf liver has been investigated by initial-velocity measurements with varying concentrations of two carboxylase substrates and constant, nonsaturating concentrations of the other two substrates. With all combinations of the varied substrates t...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/0003-9861(88)90578-4
更新日期：1988-07-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2010.12.031
更新日期：2011-04-01 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2008.01.007
更新日期：2008-03-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章,评审
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更新日期：2018-07-15 00:00:00
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journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2012.08.015
更新日期：2012-12-15 00:00:00
abstract：:Methylglyoxal (MGO), a reactive dicarbonyl metabolite is a potent arginine directed glycating agent which has implications for diabetes-related complications. Dicarbonyl metabolites are produced endogenously and in a state of misbalance, they contribute to cell and tissue dysfunction through protein and DNA modificati...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1016/j.abb.2018.02.019
更新日期：2018-05-01 00:00:00
abstract：:Three heme-containing proteins of M(r) 57,000, 46,000, and 42,000 have been isolated from microsomes of elicitor-treated suspension-cultured cells of French bean. Following purification to homogeneity they were shown to be distinct with respect to amino acid and sugar compositions. The M(r) 57,000 protein proved to be...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1993.1323
更新日期：1993-07-01 00:00:00
abstract：:Complementary peptides to interleukin-2 (IL-2) sequences important for receptor binding were tested for their ability to mimic natural receptors and act as inhibitors of the IL-2/p55 receptor subunit interaction. Peptides hydropathically complementary to IL-2 sequences 15-27 and 40-54 were synthesized in a linear and ...
journal_title：Archives of biochemistry and biophysics
pub_type： 杂志文章
doi：10.1006/abbi.1995.1201
更新日期：1995-04-01 00:00:00
