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Faculty of Environmental Sciences
Document Details
Document Type
:
Article In Journal
Document Title
:
Characterization of a spontaneous nonmagnetic mutant of Magnetospirillum gryphiswaldense reveals a large deletion comprising a putative magnetosome island
دراسة خصائص طفرة غير مغنطيسية من Magnetospirillum gryphiswaldense تظهر إزالة كبيرة لجزيرة مغنطيسية
Document Language
:
English
Abstract
:
Abstract Frequent spontaneous loss of the magnetic phenotype was observed in stationary-phase cultures of the magnetotactic bacterium agnetospirillum gryphiswaldense MSR-1. A nonmagnetic mutant, designated strain MSR-1B, was isolated and characterized. The mutant lacked any structures resembling magnetosome crystals as well as internal membrane vesicles. The growth of strain MSR-1B was impaired under all growth conditions tested, and the uptake and accumulation of iron were drastically reduced under iron-replete conditions. A large chromosomal deletion of approximately 80 kb was identified in strain MSR-1B, which comprised both the entire mamAB and mamDC clusters as well as further putative operons encoding a number of magnetosomeassociated proteins. A bacterial artificial chromosome clone partially covering the deleted region was isolated from the genomic library of wild-type M. gryphiswaldense. Sequence analysis of this fragment revealed that all previously identified mam genes were closely linked with genes encoding other magnetosome-associated proteins within less than 35 kb. In addition, this region was remarkably rich in insertion elements and harbored a considerable number of unknown gene families which appeared to be specific for magnetotactic bacteria. Overall, these findings suggest the existence of a putative large magnetosome island in M. gryphiswaldense and other magnetotactic bacteria.
ISSN
:
5779-5790
Journal Name
:
JOURNAL OF BACTERIOLOGY
Volume
:
185
Issue Number
:
19
Publishing Year
:
1424 AH
2003 AD
Article Type
:
Article
Added Date
:
Saturday, September 3, 2011
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
محمد حسين مدكور
Madkour, Mohamed Hussein
Researcher
Doctorate
madkour55@yahoo.com
Files
File Name
Type
Description
30348.pdf
pdf
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