HetP and its three homologues: regions necessary for function of HetP and requirement of homologues for fixation of nitrogen in the filamentous cyanobacterium Anabaena sp. strain PCC 7120
Date
2013-08
Authors
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
University of Hawaii at Manoa
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
The filamentous cyanobacterium Anabaena sp. strain PCC 7120 is a Gram-negative prokaryote that performs oxygenic photosynthesis. In addition to being an obligate phototroph, Anabaena is capable of differentiating specialized nitrogen-fixing cells called heterocysts. The development of terminally-differentiated heterocyst cells occurs in the absence of fixed nitrogen and forms a one-dimensional pattern along the filament of vegetative cells. The exchange of intercellular signals controls the regulated spacing of the heterocyst cells that on average arise every tenth cell along the filament (Figure 1). The formation of heterocyst cells effectively separates the oxygen-labile nitrogenase complex from oxygen-evolving photosynthesis that occurs in vegetative cells. Heterocysts and vegetative cells are mutually interdependent. Heterocyst cells lack photosystem II and the capacity to fix carbon and must rely on the vegetative cells for sources of reductant. In return, heterocysts supply the filament with fixed nitrogen (Cumino et al. 2007; Marcozzi et al 2009). The development of two distinct cell types in a simple one-dimensional pattern makes Anabaena a simple example of cellular differentiation and pattern formation.
Description
Keywords
oxygen-evolving photosynthesis
Citation
Extent
Format
Geographic Location
Time Period
Related To
Theses for the degree of Master of Science (University of Hawaii at Manoa). Microbiology.
Related To (URI)
Table of Contents
Rights
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.