Abstract:
:Isolated membranes of the extreme haloalkaliphilic archaeon Natronococcus occultus were able to hydrolyze ATP via an ATPase, which required the presence of Mg(2+), high concentrations of NaCl, and a pH value of 9. The native molecular mass of the purified ATPase was 130 kDa and was composed of 74- and 61-kDa subunits. Enzyme activity was specific for the hydrolysis of ATP with slight activity towards GTP, CTP, and ITP. The enzyme required NaCl for maximal activity but Na(2)SO(4) and (NH(4))(2)SO(4) could substitute. The enzyme showed no activity if Na(2)SO(3) or sodium citrate was substituted for NaCl. The ATPase from N. occultus was inhibited by NBD-Cl, NaN(3), and ouabain, and was sensitive to nitrate, vanadate, DCCD, and bafilomycin A(1). It was not inhibited by NEM in contrast to other previously characterized halophile ATPases. The ATPase had a K(M) of 0.5 mM and appeared to be non-competitively inhibited by NaN(3) with a K(I) of 3.1 mM.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Eddy ML,Jablonski PEdoi
10.1111/j.1574-6968.2000.tb09232.xkeywords:
subject
Has Abstractpub_date
2000-08-15 00:00:00pages
211-4issue
2eissn
0378-1097issn
1574-6968pii
S0378-1097(00)00285-8journal_volume
189pub_type
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