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02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
01:16Transduction
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
01:26Bacterial Protein Maturation
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
01:29Translational Regulation
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
02:28Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Pathogen-mediated posttranslational modifications: A re-emerging field.
1Institut Pasteur, Département de Biologie Cellulaire et Infection, Paris, France.
Cell
|November 30, 2010
Summary
Pathogens use posttranslational modifications to manipulate host cell signaling pathways, like NF-kB and MAP kinase, aiding their survival and spread. Understanding these mechanisms is crucial for developing new anti-infective therapies.
Area of Science:
- Microbiology
- Immunology
- Molecular Biology
Background:
- Pathogens employ sophisticated strategies to overcome host defenses.
- Posttranslational modifications (PTMs) are critical molecular events in cellular processes.
Purpose of the Study:
- To highlight the role of pathogen-derived PTMs in manipulating host cell signaling.
- To underscore the importance of PTMs in infection, replication, and immune evasion.
Main Methods:
- Review of recent studies on pathogen PTMs and host-pathway interactions.
- Analysis of how PTMs target key host signaling cascades.
Main Results:
- Pathogens utilize PTMs to effectively modulate host factors essential for infection.
- Specific targeting of NF-kB and MAP kinase pathways by pathogen PTMs is demonstrated.
- PTMs are shown to be vital for pathogen replication, propagation, and immune evasion.
Conclusions:
- Pathogen-mediated PTMs represent a significant mechanism for subverting host immunity.
- These findings offer novel insights into pathogen-host interactions.
- Further research into PTMs can lead to the development of innovative therapeutic strategies against infectious diseases.