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Genome Annotation and Assembly

Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.

Ligand Binding and Linkage

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...

Covalently Linked Protein Regulators

Covalently 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.

Gene Families

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...

Protein Networks

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

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Related Experiment Video

Updated: Jun 17, 2026

Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics

Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics

Published on: June 17, 2012

Considerations to improve functional annotations in biological databases.

Alfonso Benítez-Páez¹

¹Bioinformatic Analysis Group (GABi), Centro de Investigación y Desarrollo en Biotecnología (CIDBIO), Bogotá D.C., Colombia, USA. abenitez@cidbio.org

Omics : a Journal of Integrative Biology

|January 6, 2010

Summary

Biological databases show a deficit in functional annotation for Escherichia coli proteins, hindering bioinformatics tasks. Improving annotation speed and quality is crucial for reliable scientific data.

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Annotation of Plant Gene Function via Combined Genomics, Metabolomics and Informatics

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A Bioinformatics Pipeline for Investigating Molecular Evolution and Gene Expression using RNA-seq

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Published on: May 28, 2021

Area of Science:

Bioinformatics
Molecular Biology
Genomics

Background:

Efficient electronic indexing of scientific information is crucial but faces challenges in functional annotation.
Accurate functional annotation is critical for bioinformatics, impacting functional genomics and protein function prediction.
Existing information management systems struggle with slow and difficult annotation of single literature records.

Purpose of the Study:

To assess the functional annotation status of uncharacterized proteins in Escherichia coli K12.
To identify issues contributing to the lack of functional annotation in biological databases.
To propose solutions for improving the speed and quality of functional annotation.

Main Methods:

Compiled functional characterizations for a sample of uncharacterized Escherichia coli K12 proteins.
Utilized data from Swiss-Prot, PubMed, and EcoCyc databases.
Evaluated postulated causes for annotation deficits and assessed potential solutions.

Main Results:

Demonstrated a significant functional annotation deficit in biological databases for Escherichia coli K12 proteins.
Identified specific issues contributing to the slow and difficult annotation process.
Proposed solutions aimed at enhancing annotation efficiency and reliability.

Conclusions:

The study highlights a critical need to address the functional annotation deficit in biological databases.
Improvements in annotation speed and quality are essential for advancing bioinformatics and providing reliable scientific information.
The findings encourage new efforts to enhance the functional characterization of proteins.