Linked Life Data

2752013

Source:http://linkedlifedata.com/resource/pubmed/id/2752013

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1989-8-29
pubmed:abstractText
Human tumor necrosis factor (TNF) alpha/cachectin was expressed in the methylotrophic yeast Pichia pastoris at high levels (greater than 30% of the soluble protein) by placing the TNF cDNA under the control of regulatory sequences derived from the alcohol oxidase gene. Batch fermentor cultures at cell densities of 50 and 85 g dry cell weight/L contained approximately 6 X 10(10) and 10(11) units/L TNF bioactivity (6 and 10 g/L TNF), respectively. TNF productivity of 0.108 g L-1 h-1 was obtained in the continuous mode on glycerol- and methanol-mixed feed at 25 g dry cell weight/L cell density. TNF contained in the yeast cell lysate was soluble, displayed full cytotoxic activity, and was recognized by antibodies prepared against TNF derived from Escherichia coli. TNF was purified to greater than 95% purity with greater than 75% recovery by using three sequential chromatographic steps with a coordinated effluent-affluent buffer scheme which allowed one eluate to also serve as the loading buffer for the succeeding column. The amino acid composition, NH2-terminal amino acid sequence, isoelectric point, and minimal molecular weight determined for TNF corroborated those properties predicted from the nucleotide sequence. Sedimentation data indicated that TNF in the native form is a compact trimer held by noncovalent interactions. Circular dichroic spectra of TNF resemble those of proteins with high beta structure. TNF exhibited cachectic activity on mouse 3T3-L1 cells at about the same equivalence as the cytotoxic activity toward mouse L929 cells. In the criteria examined, TNF derived from P. pastoris closely resembles TNF derived from recombinant E. coli and human HL-60 cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
2
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
N
pubmed:pagination
4117-25
pubmed:dateRevised
2006-5-1
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
High-level expression, purification, and characterization of recombinant human tumor necrosis factor synthesized in the methylotrophic yeast Pichia pastoris.
pubmed:affiliation
Phillips Petroleum Company, Bartlesville, Oklahoma 74004.
pubmed:publicationType
Journal Article