Covalent Modification of the Iron Protein of Nitrogenase from Rhodospirillum Rubrum by Adenosine Diphosphoribosylation of a Specific Arginine Residue

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1985 May 1

PMID 3923473

Citations 59

Authors

M R POPE

S A Murrell

P W Ludden

Affiliations

Soon will be listed here.

Abstract

Nitrogenase in Rhodospirillum rubrum is inactivated in vivo by the covalent modification of the Fe protein with a nucleotide. The preparation of two modified peptides derived from proteolytic digestion of the inactive Fe protein is described. The modifying group is shown to be adenosine diphosphoribose, linked through the terminal ribose to a guanidino nitrogen of arginine. The structural features were established by using proton and phosphorus NMR, positive- and negative-ion fast atom bombardment mass spectrometry, and fast atom bombardment/collisionally activated decomposition mass spectrometry. Spectral methods along with chromatographic analysis and sequential degradation established the sequence of the modification site of Fe protein as Gly-Arg(ADR-ribose)-Gly-Val-Ile-Thr. This corresponds to the sequence in the Fe protein from Azotobacter vinelandii for amino acid residues 99 to 104.

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