scholarly journals ISOLATION AND CHARACTERIZATION OF NUCLEASE MUTANTS IN NEUROSPORA CRASSA

Genetics ◽  
1969 ◽  
Vol 63 (1) ◽  
pp. 75-92
Author(s):  
T Ishikawa ◽  
A Toh-E ◽  
I Uno ◽  
K Hasunuma
Keyword(s):  
Neurospora Crassa ◽  
Isolation And Characterization

scholarly journals Isolation and Characterization of a Mitochondrially Synthesized Polypeptide from Neurospora crassa cni-1 Mutant

1975 ◽  
Vol 356 (2) ◽  
pp. 1595-1604 ◽  
Author(s):  
Rainer Michel ◽  
Anton Liebl ◽  
Werner Machleidt ◽  
Joachim Otto ◽  
Walter Neupert
Keyword(s):  
Neurospora Crassa ◽  
Isolation And Characterization

scholarly journals ISOLATION AND CHARACTERIZATION OF CHROMATIN FROM NEUROSPORA CRASSA

1969 ◽  
Vol 43 (1) ◽  
pp. 51-58 ◽  
Author(s):  
R. S. Dwivedi ◽  
S. K. Dutta ◽  
D. P. Bloch
Keyword(s):  
Amino Acid ◽  
Neurospora Crassa ◽  
Polyacrylamide Gel Electrophoresis ◽  
Average Diameter ◽  
Uv Absorption ◽  
Eosin Y ◽  
Basic Proteins ◽  
Isolation And Characterization ◽  
Calf Thymus

Different preparations of chromatin isolated from mycelia of Neurospora crassa were analyzed for DNA-associated RNA and proteins. The UV absorption spectra, the ultrastructure of chromatin, and the amino acid composition of the acid-extractable proteins were studied. The protein:DNA ratios range from 1.5 to 2.8; the RNA:DNA ratios range from 0.5 to 1.24. UV absorption shows a macimum at 259 mµ and a minimum at 238–239 mµ. The E280/E260 ranges from 0.59 to 0.70. Electron microscopy reveals a fibrous structure with individual fibers of 120–150 A average diameter. Attempts were made to study the protein by polyacrylamide gel electrophoresis and amino acid analysis. The results indicate that Neurospora chromatin does not contain basic proteins comparable to calf thymus histone. The ratios of basic to acidic amino acids range from 0.93 to 1.19. On electrophoresis, no bands are seen whose positions correspond to those of histones. Staining for basic proteins with fast green or eosin Y at pH 8.2 also shows a negative reaction, suggesting the absence of histones.

scholarly journals Isolation and Characterization of Low-Kynureninase Mutants of Neurospora crassa

1974 ◽  
Vol 117 (3) ◽  
pp. 1117-1120 ◽  
Author(s):  
Steven C. Schlitt ◽  
Gabriel Lester ◽  
Peter J. Russell
Keyword(s):  
Neurospora Crassa ◽  
Isolation And Characterization

scholarly journals THE ISOLATION AND CHARACTERIZATION OF MUTANTS DEFECTIVE IN NITRATE ASSIMILATION IN NEUROSPORA CRASSA

Genetics ◽  
1980 ◽  
Vol 95 (3) ◽  
pp. 649-660
Author(s):  
A Brian Tomsett ◽  
Reginald H Garrett
Keyword(s):  
Nitrate Reductase ◽  
Neurospora Crassa ◽  
Nitrate Assimilation ◽  
Xanthine Dehydrogenase ◽  
Growth Patterns ◽  
Isolation And Characterization ◽  
Complex Locus ◽  
Complementation Groups ◽  
Nitrate And Nitrite

ABSTRACT The isolation and characterization of mutants altered for nitrate assimilation in Neurospora crassa is described, The mutants isolated can be subdivided into five classes on the basis of growth tests that correspond to the growth patterns of existing mutants at six distinct loci. Mutants with growth characteristics like those of nit-2, nit-3 and nit-6 are assigned to those loci on the basis of noncomplementation and lack of recombination. Mutants that, from their growth patterns, appear to lack the molybdenum-containing cofactor for both nitrate reductase and xanthine dehydrogenase subdivide into three loci (nit-7, nit4 and nit-9), all of which are genetically distinct from nit-1. nit-9 is a complex locus consisting of three complementation groups and thus appears similar to the cnxABC locus of Asperillus nidulans. Extensive complementational and recombinational analyses reveal that nit-4 and nit-5 are alleles of the same locus, and two new alleles of that locus have been isolated. The results indicate that, as in A. nidulans, nitrate assimilation in N. crassa requires at least four loci (nit-1,7,8 and 9) to produce the molybdenum co-factor for nitrate reductase (and xanthine dehydrogenase), one locus (nit-3) to code for the nitrate reductase apoprotein, one locus (nit-6) to code for the nitrite reductase approtein and only one locus (nit-4/5) for the regulation of induction of the pathway by nitrate and nitrite.

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