ATP-dependent and NAD-dependent modification of glutamine synthetase from Rhodospirillum rubrum in vitro.

D. Woehle,B. Lueddecke,P. Ludden

Published 1990 in Journal of Biological Chemistry

ABSTRACT

Glutamine synthetase from the photosynthetic bacterium Rhodospirillum rubrum is the target of both ATP- and NAD-dependent modification. Incubation of R. rubrum cell supernatant with [alpha-32P]NAD results in the labeling of glutamine synthetase and two other unidentified proteins. Dinitrogenase reductase ADP-ribosyltransferase does not appear to be responsible for the modification of glutamine synthetase or the unidentified proteins. The [alpha-32P]ATP- and [alpha-32P] NAD-dependent modifications of R. rubrum glutamine synthetase appear to be exclusive and the two forms of modified glutamine synthetase are separable on two-dimensional gels. Loss of enzymatic activity by glutamine synthetase did not correlate with [alpha-32P]NAD labeling. This is in contrast to inactivation by nonphysiological ADP-ribosylation of other glutamine synthetases by an NAD:arginine ADP-ribosyltransferase from turkey erythrocytes (Moss, J., Watkins, P.A., Stanley, S.J., Purnell, M.R., and Kidwell, W.R. (1984) J. Biol. Chem. 259, 5100-5104). A 32P-labeled protein spot comigrates with the NAD-treated glutamine synthetase spot when glutamine synthetase purified from H3 32PO4-grown cells is analyzed on two-dimensional gels. The adenylylation site of R. rubrum glutamine synthetase has been determined to be Leu-(Asp)-Tyr-Leu-Pro-Pro-Glu-Glu-Leu-Met; the tyrosine residue is the site of modification.

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