Doctoral Dissertations


Jiamin Zeng

Keywords and Phrases

Schizophyllum commune


"Phenylalanine ammonia-lyase (PAL) (EC 4. 3. 1. 5) activity was greatly increased in Schizophyllum commune 4-40 by growing the organism in a medium containing L-Phenylalanine. S. commune 4-40 PAL was purified 19.2 fold by a procedure utilizing Sephadex G-50 chromatography, ammonium sulfate fractionation and chromatographic separation on Sephadex G-200. The enzyme has a native molecular weight of 247,000. The Km value for L-phenylalanine is 0.232 mM, the Vmax is 0.415 mM/minute and the kcat is 0.0164/second for the purified lyase.

Two attempts were made to synthesize a cDNA library from mRNA isolated from S. commune 4-40. Soybean PAL DNA and Rhodotorula rubra PAL DNAs were used as probes for screening for the PAL gene in the cDNA libraries and a genomic library prepared by Specht and Ulrich. The inability to cut the DNA isolated from reconstituted phage supposedly containing DNA from the cDNA library into more than 2 fragments with a mixture of two restriction endonucleases plus the high incidence of positive plaques in the screening tests, suggest that a true library had not been synthesized"--Abstract, page iii.


Siehr, Donald J.

Committee Member(s)

Hanna, Samir B.
Frank, Ronald L.



Degree Name

Ph. D. in Chemistry


University of Missouri--Rolla

Publication Date

Summer 1993


x, 111 pages

Note about bibliography

Includes bibliographical references (pages 107-110).


© 1993 Jiamin Zeng, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type




Subject Headings

DNA -- Analysis
Messenger RNA

Thesis Number

T 6634

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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