Format

Send to

Choose Destination
See comment in PubMed Commons below
Proc Natl Acad Sci U S A. 1973 Oct;70(10):2727-31.

Differentiation in Nostoc muscorum: nitrogenase is synthesized in heterocysts.

Abstract

Cellular differentiation can be observed in certain filamentous blue-green algae after transfer of the cells from medium containing NH(4) (+) or NO(3) (-) to nitrogen-free medium. The appearance of differentiated cells (heterocysts) is accompanied by an increase in the activity of nitrogenase, an enzyme complex that reduces N(2) to NH(3). We have separated vegetative cells from heterocysts in differentiated filaments of Nostoc muscorum, and analyzed their proteins by polyacrylamide-gel electrophoresis. The pattern of incorporation of (35)SO(4) (-) into proteins of the two cell types during differentiation indicates that the increase in nitrogenase activity is due to the de novo synthesis of nitrogenase proteins predominantly, if not exclusively, in heterocysts.

PMID:
4200722
PMCID:
PMC427096
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for PubMed Central
    Loading ...
    Support Center