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Journal of Biochemistry Advance Access published online on February 22, 2008
Journal of Biochemistry, doi:10.1093/jb/mvn025
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© 2008 The Japanese Biochemical Society

Facilitation of Dissociation Reaction of Nucleotides Bound to Mycobacterium tuberculosis DnaA

Kohji Yamamoto1,*, Meredith Moomey2, Malini Rajagopalan2 and Murty V. V. S. Madiraju2

1Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, Fukuoka 812-8581, Japan
2Biomedical Research, The University of Texas Health Center at Tyler, 11937 U.S. Hwy @ 271, Tyler, TX 75708-3154, U.S.A

*To whom correspondence should be addressed: Dr. Kohji Yamamoto: Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan Tel: +81-92-621-4991, Fax: +81-92-624-1011, E-mail: yamamok{at}agr.kyushu-u.ac.jp

Received November 14, 2007; Accepted February 14, 2008


  Abstract

Acidic phospholipids have been shown to promote dissociation of bound nucleotides from Mycobacterium tuberculosis DnaA (DnaATB) purified under denaturing conditions (Yamamoto et. al, Biochemical J., 363, 305-311 (2002)). In the present study, we show that a majority of DnaATB in non-overproducing cells of M. tuberculosis is membrane associated. Estimation of phospholipid phosphorus following chloroform: methanol extraction of soluble DnaATB purified under native conditions (nDnaATB) confirmed the association with phospholipids. nDnaATB exhibited weak ATPase activity, and rapidly exchanged ATP for bound ADP in the absence of any added phospholipids. We suggest that the outcome of intracellular DnaATB -nucleotide interactions, hence DnaATB activity, is influenced by phospholipids.

Key Words: ADP, ATP, ATPase, DNA replication, mycobacteria


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