Linked Life Data

12659834

Source:http://linkedlifedata.com/resource/pubmed/id/12659834

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2003-3-27
pubmed:abstractText
Three types of recombinant pre-S antigens (i.e., pre-S1S2) of hepatitis B virus (HBV) were synthesized in Saccharomyces cerevisiae and secreted into extracellular medium: wild type (pre-S1S2) and two mutant antigens, pre-S1 degrees S2 (Asn15Gln) and pre-S1 degrees S2 degrees (Asn15Gln and Asn123Gln). An N-terminus sequence (Ser5-Ala28) of human interleukin 1 beta (hIL-1 beta) was used as synthetic prosequence of recombinant HBV surface antigen (pre-S), secreted from S. cerevisiae. The expression cassette comprised the signal peptide of the killer toxin of Kluyveromyces lactis, the synthetic prosequence above, KEX2 dibasic endopeptidase cleavage site (-Lys-Arg-), and the surface antigen. The recombinant pre-S1S2 and pre-S1 degrees S2 were secreted in the hyper-mannosylated form, while the recombinant pre-S1 degrees S2 degrees was produced without N-glycosylation. It has been demonstrated that the two particular N-linked glycans at Asn15 and Asn123 interfered with the B-cell response to the HBV-derived pre-S1S2, resulting in low titers of pre-S1S2-neutralizing antibodies. This problem was overcome by eliminating both of the N-glycosylation signals. Despite enhanced immunogenicity, the recombinant pre-S1 degrees S2 degrees showed two major problems: (1) inefficient Kex2 cleavage process in the secretory pathway and (2) the severe proteolytic degradation by yeast proteases. The efficiency of Kex2 cleavage increased dramatically by removing N-glycosylation signal in the synthetic prosequence, but the proteolysis of pre-S1 degrees S2 degrees was somewhat inevitable. Further systematic approaches including modulation of degree of N-glycosylation or relocation of N-glycosylation sites in the recombinant pre-S1S2 may make it possible to achieve both enhanced immunogenicity and resistance towards proteolytic degradation of the secreted pre-S antigen.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
4
pubmed:volume
303
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
427-32
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
The influence of glycosylation on secretion, stability, and immunogenicity of recombinant HBV pre-S antigen synthesized in Saccharomyces cerevisiae.
pubmed:affiliation
Department of Chemical and Biological Engineering, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea. leejw@korea.ac.kr
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't