The X gene of hepatitis B virus shows a high level stimulation of the Rous sarcoma virus long terminal repeat in the methylotropic yeast, Pichia pastoris.

Abstract:

:In order to study the transactivational property of the X gene in the methylotropic yeast Pichia pastoris, a Rous sarcoma virus-chloramphenicol acetyltransferase (RSV-CAT) cassette was co-transformed and integrated into the host yeast strain as a reporter which showed an overwhelming CAT activity. Immunoprecipitation of the yeast cell extracts with an X-specific monoclonal antibody, however, showed a low level expression of the X gene. Therefore besides a trans-effect of the X protein, the enhanced reporter activity could be a manifestation of a cis-effect of the X gene sequences also. Therefore, unlike the transactivation studies with X gene in animal cells where limited functional activity is observed, P. pastoris appears to be an excellent system to study cis- and trans-aspects of gene regulation by the X gene.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Lal SK,Kumar V

doi

10.1016/s0014-5793(99)00930-8

keywords:

subject

Has Abstract

pub_date

1999-07-30 00:00:00

pages

108-12

issue

1

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(99)00930-8

journal_volume

456

pub_type

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