1
|
Stone SR, Mark A, Morrison JF. Interaction of analogs of nicotinamide adenine dinucleotide phosphate with dihydrofolate reductase from Escherichia coli. Biochemistry 2002. [DOI: 10.1021/bi00314a014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
2
|
Van de Casteele M, Legrain C, Wilquet V, Glansdorff N. The dihydrofolate reductase-encoding gene dyrA of the hyperthermophilic bacterium Thermotoga maritima. Gene X 1995; 158:101-5. [PMID: 7789791 DOI: 10.1016/0378-1119(95)00090-s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The structural gene (dyrA) encoding dihydrofolate reductase (DHFR) of Thermotoga maritima has been cloned, sequenced and expressed in Escherichia coli. The dyrA gene, located immediately upstream from the gene encoding aspartate carbamoyltransferase (pyrB), encodes a highly thermostable enzyme with a distinct thermophilic activity profile. Important structural features are conserved among all bacterial DHFR, yet the DHFR of T. maritima appears unique in a number of insertions and deletions, some of which are reminiscent of eukaryotic DHFR.
Collapse
Affiliation(s)
- M Van de Casteele
- Laboratorium voor Erfelijkheidsleer en Microbiologie, Vrije Universiteit Brussel, Belgium
| | | | | | | |
Collapse
|
3
|
Slobodyansky E, Guidotti A, Wambebe C, Berkovich A, Costa E. Isolation and characterization of a rat brain triakontatetraneuropeptide, a posttranslational product of diazepam binding inhibitor: specific action at the Ro 5-4864 recognition site. J Neurochem 1989; 53:1276-84. [PMID: 2769267 DOI: 10.1111/j.1471-4159.1989.tb07425.x] [Citation(s) in RCA: 111] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This report describes the purification and characterization from rat brain of triakontatetraneuropeptide (TTN, DBI 17-50), a major biologically active processing product of diazepam binding inhibitor (DBI). Brain TTN was purified by immunoaffinity chromatography with polyclonal octadecaneuropeptide, DBI 33-50) antibodies coupled to CNBr-Sepharose 4B followed by two reverse-phase HPLC steps. The amino acid sequence of the purified peptide is: Thr-Gln-Pro-Thr-Asp-Glu-Glu-Met-Leu-Phe-Ile-Tyr-Ser-His-Phe-Lys-Gln-Ala-Thr-Val - Gly-Asp-Val-Asn-Thr-Asp-Arg-Pro-Gly-Leu-Leu-Asp-Leu-Lys. Synthetic TTN injected intracerebroventricularly into rats induces a proconflict activity (IC50 0.8 nmol/rat) that is prevented by the specific "peripheral" benzodiazepine (BZ) receptor antagonist isoquinoline carboxamide, PK 11195, but not by the "central" BZ receptor antagonist imidazobenzodiazepine, flumazenil. TTN displaces [3H]Ro 5-4864 from synaptic membranes of olfactory bulb with a Ki of approximately 5 microM. TTN also enhances picrotoxinin inhibition of gamma-aminobutyric acid (GABA)-stimulated [3H]flunitrazepam binding. These data suggest that TTN, a natural DBI processing product acting at "Ro 5-4864 preferring" BZ binding site subtypes, might function as a putative neuromodulator of specific GABAA receptor-mediated effects.
Collapse
Affiliation(s)
- E Slobodyansky
- FIDIA-Georgetown Institute for the Neurosciences, Georgetown University School of Medicine, Washington, D.C. 20007
| | | | | | | | | |
Collapse
|
4
|
Human cytotoxic lymphocyte tryptase. Its purification from granules and the characterization of inhibitor and substrate specificity. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(18)37694-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
5
|
Przysiecki CT, Staggers JE, Ramjit HG, Musson DG, Stern AM, Bennett CD, Friedman PA. Occurrence of beta-hydroxylated asparagine residues in non-vitamin K-dependent proteins containing epidermal growth factor-like domains. Proc Natl Acad Sci U S A 1987; 84:7856-60. [PMID: 2825166 PMCID: PMC299422 DOI: 10.1073/pnas.84.22.7856] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Vitamin K-dependent bovine protein S has been shown to contain a posttranslationally hydroxylated asparagine within a conserved sequence in three of its epidermal growth factor (EGF)-like domains. In a review of amino acid sequences deduced from cDNA data, we have observed that a conserved sequence containing a potential asparagine hydroxylation site exists within EGF-like domains of a variety of functionally diverse proteins. We have studied a number of these and report the presence of erythro-beta-hydroxyasparagine (e-beta Hyn) in three non-vitamin K-dependent proteins: the plasma complement proteins C1r and C1s (where overbar indicates activated form) and the urinary protein uromodulin. For each protein, e-beta Hyn was identified in enzyme digests following the initial observation of erythro-beta-hydroxyaspartic acid (e-beta Hya) in acid hydrolysates of the proteins. e beta Hya and e-beta Hyn residues are detected by a postcolumn derivatization cation-exchange HPLC method herein described. HPLC isolation of the presumptive e-beta Hyn residue from enzyme digests of intact C1r allowed confirmation of its structure by GC/MS. Based upon available cDNA sequence data and observation of e-beta Hya in acid hydrolysates, we suggest other proteins in which e-beta Hyn may occur.
Collapse
Affiliation(s)
- C T Przysiecki
- Department of Pharmacology, Merck Sharp & Dohme Research Laboratories, West Point, PA 19486
| | | | | | | | | | | | | |
Collapse
|
6
|
|
7
|
Penner MH, Frieden C. Substrate-induced hysteresis in the activity of Escherichia coli dihydrofolate reductase. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(18)89030-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
8
|
Johanson RA, Henkin J. Affinity labeling of dihydrofolate reductase with an antifolate glyoxal. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(18)89615-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
9
|
Refined crystal structures of Escherichia coli and chicken liver dihydrofolate reductase containing bound trimethoprim. J Biol Chem 1985. [DOI: 10.1016/s0021-9258(18)89743-5] [Citation(s) in RCA: 204] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
10
|
Leung FC, Taylor JE, Steelman SL, Bennett CD, Rodkey JA, Long RA, Serio R, Weppelman RM, Olson G. Purification and properties of chicken growth hormone and the development of a homologous radioimmunoassay. Gen Comp Endocrinol 1984; 56:389-400. [PMID: 6096203 DOI: 10.1016/0016-6480(84)90081-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Highly purified growth hormone (GH) has been isolated from pituitary glands of chicken (Gallus domesticus), and a specific homologous radioimmunoassay (RIA) has also been developed. The purified chicken GH was active in the rat tibia bioassay and it gave a dose-dependent response which paralleled that of the bovine GH standard. High pressure liquid chromatography revealed that the purified chicken GH was homogenous. Chicken GH had an Rf value of 0.2 in disc electrophoresis, and a MW of 26,000 from sodium dodecyl sulfate-gel electrophoresis. The isoelectric point was estimated to be 7.6 by gel isoelectric focusing. The amino acid composition of chicken GH was found to be similar to that of mammalian GH, and the NH2-terminal amino acid was threonine. Partial sequencing (114 amino acids) of the chicken GH showed 79% homology with bovine GH. An antiserum was developed to the purified chicken GH in a rabbit, and it was used to develop a homologous RIA using 125I-labeled chicken GH as the ligand. The purified chicken GH was iodinated via the lactoperoxidase method to a specific activity of approximately 100 microCi/micrograms. Plasma from chickens, medium from incubation of pituitary glands, and homogenates of pituitary glands gave parallel dilution-response curves with the chicken GH standard. Mammalian GH, prolactin (PRL), follicle-stimulating hormone (FSH), and luteinizing hormone (LH) showed no cross-reaction with the 125I-labeled chicken GH. Purified turkey GH showed parallel dose response with the chicken GH, but purified turkey PRL did not cross-react. Chicken FSH and LH also showed no inhibition of binding. The minimum detectable concentration of the assay was 0.93 ng/tube, and the intraassay and interassay coefficients of variation were 9 and 16%, respectively. The specific binding of 125I-labeled chicken GH to a microsomal fraction isolated from chicken liver was identified, and the specific binding was generally low (1-4%). Turkey PRL, and chicken LH and FSH showed no inhibition of the 125I-labeled chicken GH hepatic binding and the ontogeny of the hepatic GH receptor binding sites in male and female chickens was examined.
Collapse
|
11
|
|
12
|
Mouse submaxillary gland renin. Purification and properties of minor forms, which include several differently processed forms of the major gene product and a second gene product. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(17)39736-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
13
|
Napier MA, Dewey RS, Albers-Schönberg G, Bennett CD, Rodkey JA, Marsh EA, Whinnery M, Seymour AA, Blaine EH. Isolation and sequence determination of peptide components of atrial natriuretic factor. Biochem Biophys Res Commun 1984; 120:981-8. [PMID: 6539595 DOI: 10.1016/s0006-291x(84)80203-x] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The independent isolation and sequence determination in our laboratories of three closely related Atrial Natriuretic Factor peptides from rat atria confirm the sequences of ANF peptides reported by Seidah et al and synthesized by Nutt et al [Proc. Natl. Acad. Sci., (1984) in press] and contain the sequences reported by Flynn et al [Biochem. Biophys. Res. Commun. (1983) 117: 859-865] and by Currie et al [Science (1984) 223: 67-69]. In addition, we provide proof for a C-terminal tyrosine rather than tyrosine amide in our isolated peptides.
Collapse
|
14
|
Novak P, Stone D, Burchall JJ. R plasmid dihydrofolate reductase with a dimeric subunit structure. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(17)44369-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
15
|
Chahidi C, Morliere P, Aubailly M, Dubertret L, Santus R. Photosensitization by methotrexate photoproducts. Photochem Photobiol 1983; 38:317-22. [PMID: 6634963 DOI: 10.1111/j.1751-1097.1983.tb02678.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
16
|
Guidotti A, Forchetti CM, Corda MG, Konkel D, Bennett CD, Costa E. Isolation, characterization, and purification to homogeneity of an endogenous polypeptide with agonistic action on benzodiazepine receptors. Proc Natl Acad Sci U S A 1983; 80:3531-5. [PMID: 6304714 PMCID: PMC394079 DOI: 10.1073/pnas.80.11.3531] [Citation(s) in RCA: 402] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
A brain polypeptide termed diazepam-binding inhibitor (DBI) and thought to be chemically and functionally related to the endogenous effector of the benzodiazepine recognition site was purified to homogeneity. This peptide gives a single band of protein on NaDodSO4 and acidic urea gel electrophoresis. A single UV-absorbing peak was obtained by HPLC using three different columns and solvent systems. DBI has a molecular mass of approximately equal to 11,000 daltons. Carboxyl-terminus analysis shows that tyrosine is the only residue while the amino-terminus was blocked. Cyanogen bromide treatment of DBI yields three polypeptide fragments, and the sequences of two of them have been determined for a total of 45 amino acids. DBI is a competitive inhibitor for the binding of [3H]diazepam, [3H]flunitrazepam, beta-[3H]carboline propyl esters, and 3H-labeled Ro 15-1788. The Ki for [3H]-diazepam and beta-[3H]carboline binding were 4 and 1 microM, respectively. Doses of DBI that inhibited [3H]diazepam binding by greater than 50% fail to change [3H]etorphine, gamma-amino[3H]butyric acid, [3H]-quinuclidinyl benzilate, [3H]dihydroalprenolol, [3H]adenosine, and [3H]imipramine binding tested at their respective Kd values. DBI injected intraventricularly at doses of 5-10 nmol completely reversed the anticonflict action of diazepam on unpunished drinking and, similar to the anxiety-inducing beta-carboline derivative FG 7142 (beta-carboline-3-carboxylic acid methyl ester), facilitated the shock-induced suppression of drinking by lowering the threshold for this response.
Collapse
|
17
|
Pan YC, Domin BA, Li SS, Cheng YC. Studies of amino-acid sequence in dihydrofolate reductase from a human methotrexate-resistant cell line KB/6b. Structural and kinetic comparison with mouse L1210 enzyme. EUROPEAN JOURNAL OF BIOCHEMISTRY 1983; 132:351-9. [PMID: 6840092 DOI: 10.1111/j.1432-1033.1983.tb07369.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The partial amino acid sequence of dihydrofolate reductase (DHFR, EC 1.5.1.3) from human KB/6b cells has been determined by using 3.5 mg of protein. Peptides covering the entire polypeptide chain were recovered from preparative peptide maps generated by the combination of paper chromatography and electrophoresis at pH 4.4 Peptide maps from mouse L1210 DHFR were also generated for comparison. Amino acid sequence of 75% of the 186 amino acid residues in the polypeptide chain of human KB/6b DHFR was obtained from Edman degradations and the remaining sequence was deduced from the amino acid compositions, from electrophoretic mobilities of related peptides and from the sequence homologies with other known mammalian DHFR sequences. A comparison of the proposed human DHFR sequence with the previously known sequences of mouse enzyme [Stone, et al. (1979) J. Biol. Chem. 245, 480-488] indicates that 18 differences are located in the established sequence of 139 residues and that 5 additional differences are in the tentative sequence of the remaining 47 amino acids. Kinetic properties of human KB/6b and mouse L1210 DHFR, which were determined in parallel experiments, are also compared. The possible structural-functional relationships between human and mouse DHFR are discussed.
Collapse
|
18
|
Poe M, Wu JK, Florance JR, Rodkey JA, Bennett CD, Hoogsteen K. Purification and properties of renin and gamma-renin from the mouse submaxillary gland. J Biol Chem 1983. [DOI: 10.1016/s0021-9258(18)32909-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
19
|
Bolin JT, Filman DJ, Matthews DA, Hamlin RC, Kraut J. Crystal structures of Escherichia coli and Lactobacillus casei dihydrofolate reductase refined at 1.7 A resolution. I. General features and binding of methotrexate. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(18)33497-5] [Citation(s) in RCA: 387] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
20
|
Holmes PF, Liehr JG, Henkin J. Synthesis and characterization of 2′-azidoaminopterin as a potential photoaffinity label for folate-utilizing enzymes. Bioorg Chem 1982. [DOI: 10.1016/0045-2068(82)90004-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
21
|
Smith DR, Rood JI, Bird PI, Sneddon MK, Calvo JM, Morrison JF. Amplification and modification of dihydrofolate reductase in Escherichia coli. Nucleotide sequence of fol genes from mutationally altered plasmids. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(18)34239-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
22
|
Lai PH, Pan YC, Gleisner JM, Peterson DL, Williams KR, Blakley RL. Structure of dihydrofolate reductase: primary sequence of the bovine liver enzyme. Biochemistry 1982; 21:3284-94. [PMID: 7115669 DOI: 10.1021/bi00257a006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The primary structure of dihydrofolate reductase from bovine liver has been established by Edman degradation of the intact carboxymethylated protein and of peptides obtained from the protein by the action of cyanogen bromide, trypsin, and the protease from Staphylococcus aureus, respectively. Since separation of some of the peptide mixtures by classical methods proved impossible, new systems were developed for the use of high-performance liquid chromatography to separate such mixtures. Some of the cleavage procedures used to obtain peptides gave atypical results at certain peptide bonds. The results are discussed in terms of the residues involved in these unexpectedly resistant or sensitive bonds. The sequence of the bovine liver enzyme is compared with those published for the enzyme from other sources, and known or probable functions of invariant residues are described. Sequences of vertebrate and bacterial reductases are compared and contrasted, and a possible role is considered for the residues which are invariant in bacterial reductases, but different in vertebrate reductases, in determining the selective inhibitory action of trimethoprim on bacterial reductases.
Collapse
|
23
|
Volz KW, Matthews DA, Alden RA, Freer ST, Hansch C, Kaufman BT, Kraut J. Crystal structure of avian dihydrofolate reductase containing phenyltriazine and NADPH. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(18)34956-1] [Citation(s) in RCA: 111] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
24
|
Roth B, Cheng CC. Recent progress in the medicinal chemistry of 2,4-diaminopyrimidines. PROGRESS IN MEDICINAL CHEMISTRY 1982; 19:269-331. [PMID: 6129679 DOI: 10.1016/s0079-6468(08)70332-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
25
|
Rood JI, Williams JW. Characterization of the cloned Escherichia coli dihydrofolate reductase. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 660:214-8. [PMID: 6269632 DOI: 10.1016/0005-2744(81)90162-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Dihydrofolate reductase (5,6,7,8-tetrahydrofolate: NADP+ oxidoreductase, EC 1.5.1.3) was purified from Escherichia coli strains that carried derivatives of the multicopy recombinant plasmid, pJFM8. The results of enzyme kinetic and two-dimensional gel electrophoresis experiments showed that the cloned enzyme is indistinguishable from the chromosomal enzyme. Therefore it can be concluded that these strains are ideal for use as a source of enzyme for further studies on the biochemistry and regulation of this important enzyme. The plasmid derivatives were constructed by recloning experiments that utilized several restriction endonucleases. From the analysis both of these plasmids and the purified dihydrofolate reductase enzymes it was possible to deduce the location and orientation of the dihydrofolate reductase structural gene on the parent plasmid, pJFM8.
Collapse
|
26
|
Baker DJ, Beddell CR, Champness JN, Goodford PJ, Norrington FE, Smith DR, Stammers DK. The binding of trimethoprim to bacterial dihydrofolate reductase. FEBS Lett 1981; 126:49-52. [PMID: 7016582 DOI: 10.1016/0014-5793(81)81030-7] [Citation(s) in RCA: 70] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
|
27
|
Webber S, Whiteley JM. The effect of specific amino acid modifications on the catalytic properties of rat liver dihydropteridine reductase. Arch Biochem Biophys 1981; 206:145-52. [PMID: 7212713 DOI: 10.1016/0003-9861(81)90075-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
28
|
|
29
|
Smith DR, Calvo JM. Nucleotide sequence of the E coli gene coding for dihydrofolate reductase. Nucleic Acids Res 1980; 8:2255-74. [PMID: 6159575 PMCID: PMC324076 DOI: 10.1093/nar/8.10.2255] [Citation(s) in RCA: 344] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Plasmid pLC1437a contains DNA from Escherichia coli K12 including fol, the structural gene for dihydrofolate reductase. The fol gene was mapped on this plasmid relative to several restriction endonuclease cleavage sites. fol was also cloned from strain RSO and the nucleotide sequence for the entire fol gene and its flanking regions from this strain was determined. The amino acid sequence predicted from the nucleotide sequence differs in only a few respects from the reported amino acid sequence of dihydrofolate reductase from E. coli B. The major RNA transcripts initiated at the fol promotor in vivo are approximately 550 and 590 nucleotides long. In addition to these, several longer transcripts (up to 1400 nucleotides) are present in lesser amounts. A new procedure is described for 3' end labeling of DNA fragments having blunt ends using E. coli exonuclease III and avian myeloblastoma virus reverse transcriptase.
Collapse
|
30
|
Gready JE. Dihydrofolate reductase: binding of substrates and inhibitors and catalytic mechanism. ADVANCES IN PHARMACOLOGY AND CHEMOTHERAPY 1980; 17:37-102. [PMID: 7004143 DOI: 10.1016/s1054-3589(08)60007-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
31
|
|
32
|
Stone D, Smith S. The amino acid sequence of the trimethoprim-resistant dihydrofolate reductase specified in Escherichia coli by R-plasmid R67. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86600-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
33
|
Poe M, Hoogsteen K, Matthews D. Proton magnetic resonance studies on Escherichia coli dihydrofolate reductase. Assignment of histidine C-2 protons in binary complexes with folates on the basis of the crystal structure with methotrexate and on chemical modifications. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(19)86867-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
34
|
|
35
|
Dihydrofolate reductase from trimethoprim-resistant Escherichia coli MB 3746 and MB 3747. Purification, amino acid composition, and some kinetic properties. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(17)37725-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|