Endospore formation by Bacillus subtilis is a complex and dynamic process. One of the major challenges of sporulation is the assembly of a protective, multilayered, proteinaceous spore coat, composed of at least 70 different proteins. Spore coat formation can be divided into two distinct stages. The first is the recruitment of proteins to the spore surface, dependent on the morphogenetic protei...

in order to investigate the presence of barley mild mosaic virus, 425 samples of barley and wheat from razavi khorasan, northern khorasan, golestan, yazd and western azarbayjan were collected in spring 2011. plolyclonal antiserum was used in order to detect baymv by das-elisa. the highest level of baymv infection was found in azarbayjan gharbi and detect inrazavi khorasan, northern khorasan and...

We have investigated determinants of polyhead formation in bacteriophage P22 in order to understand the molecular mechanism by which coat protein assembly goes astray. Polyhead assembly is caused by amino acid substitutions in coat protein at position 170, which is located in the β-hinge. In vivo scaffolding protein does not correct polyhead assembly by F170A or F170K coat proteins, but does fo...

A method was developed to screen bacteria for synthesis of mutant proteins with altered assembly and solubility properties using bacteriophage MS2 coat protein as a model self-associating protein. Colonies expressing coat protein from a plasmid were covered with an agarose overlay under conditions that caused the lysis of some of the cells in each colony. The proteins thus liberated diffused th...

Spores of the bacterium Bacillus subtilis are encased in a two-layered protein shell, which consists of an electron-translucent, lamellar inner coat, and an electron-dense outer coat. The coat protein CotE is both a structural component of the coat and a morphogenetic protein that is required for the assembly of the outer coat. We now show that CotE is located in the outer coat of the mature sp...

The RNA bacteriophages of E. coli specifically encapsidate a single copy of the viral genome in a protein shell composed mainly of 180 molecules of coat protein. Coat protein is also a translational repressor and shuts off viral replicase synthesis by interaction with a RNA stem-loop containing the replicase initiation codon. We wondered whether the translational operator also serves as the vir...

The first step in assembly of the bacteriophage P22 is the formation of a T=7 icosahedral "procapsid," the major components of which are the coat protein and an inner core composed of the scaffolding protein. Although not present in the mature virion, the scaffolding protein is required for procapsid assembly. Eleven amino-acid residues at the extreme carboxyl terminus of the scaffolding protei...

Background: Expression of virus coat protein (CP) in Escherichia coli often leads to production of partially folded aggregated proteins which are called inclusion bodies. Grapevine fanleaf virus (GFLV) is one of the most serious and widespread grapevine virus diseases around the world and in Iran.Objective: The main objective of this study was to find a s...

The coat protein of the RNA bacteriophage MS2 is a specific RNA binding protein that represses translation of the viral replicase gene during the infection cycle. As an approach to characterizing the RNA-binding site of coat protein we have isolated a series of coat mutants that suppress the effects of a mutation in the translational operator. Each of the mutants exhibits a super-repressor phen...