Characterization of calcineurin-dependent response element binding protein and its involvement in copper-metallothionein gene expression in Neurospora.

Abstract:

:In continuation of our recent observations indicating the presence of a lone calcineurin-dependent response element (CDRE) in the -3730bp upstream region of copper-induced metallothionein (CuMT) gene of Neurospora [K.S. Kumar, S. Dayananda, C. Subramanyam, Copper alone, but not oxidative stress, induces copper-metallothionein gene in Neurospora crassa, FEMS Microbiol. Lett. 242 (2005) 45-50], we isolated and characterized the CDRE-binding protein. The cloned upstream region of CuMT gene was used as the template to specifically amplify CDRE element, which was immobilized on CNBr-activated Sepharose 4B for use as the affinity matrix to purify the CDRE binding protein from nuclear extracts obtained from Neurospora cultures grown in presence of copper. Two-dimensional gel electrophoresis of the affinity purified protein revealed the presence of a single 17kDa protein, which was identified and characterized by MALDI-TOF. Peptide mass finger printing of tryptic digests and analysis of the 17kDa protein matched with the regulatory beta-subunit of calcineurin (Ca(2+)-calmodulin dependent protein phosphatase). Parallel identification of nuclear localization signals in this protein by in silico analysis suggests a putative role for calcineurin in the regulation of CuMT gene expression.

authors

Kumar KS,Ravi Kumar B,Siddavattam D,Subramanyam C

doi

10.1016/j.bbrc.2006.05.010

subject

Has Abstract

pub_date

2006-07-07 00:00:00

pages

1010-3

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)01051-5

journal_volume

345

pub_type

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