- A UniProt entry name is a mnemonic identifier associated with a protein entry in the UniProt Knowledgebase. Entry names were designed to provide a compact and recognizable way of referring to proteins while also conveying information about the protein and organism. Although UniProt accession numbers are generally preferred as stable database identifiers, entry names remain useful when navigating and interpreting UniProtKB records.
- UniProt entry names are found within UniProtKB, which contains both reviewed Swiss-Prot entries and unreviewed TrEMBL entries. An entry normally contains an accession number, entry name, protein name, gene information, organism, amino acid sequence, functional annotation, sequence features, evidence, literature, and cross-references.
- The most important distinction to understand is the difference between a UniProt accession number and entry name. The accession number primarily serves as the stable identifier for the database record, whereas the entry name is a mnemonic identifier intended to make the protein record easier to recognize. Researchers should therefore avoid treating accession numbers and entry names as interchangeable identifiers.
- A UniProt entry name historically contains information related to the protein and organism. The naming convention can make an entry easier to recognize, particularly when working with well-characterized proteins from commonly studied organisms. However, users should not rely on the entry name alone to determine the complete biological identity or function of a protein.
- The entry name is associated with a particular UniProtKB protein entry, while the protein itself can have multiple names. A protein may have a recommended name, alternative names, gene names, synonyms, and names used in different scientific publications. The entry name provides a standardized mnemonic reference within the UniProt system.
- Protein names and entry names serve different purposes. The protein name describes what the protein is or what it is believed to be, while the entry name acts as a compact database identifier. This distinction becomes especially important when a protein has multiple names or when the same protein name occurs in different organisms.
- Gene names are also different from UniProt entry names. A gene name identifies a gene according to the relevant naming system, while a UniProt entry name identifies a protein record. A gene can produce multiple protein products, and a protein entry can therefore contain information about isoforms or alternative products.
- The organism is another important part of interpreting an entry name. Similar proteins can occur in many species, and an entry name is interpreted within the context of its UniProtKB record and organism. Researchers should always check the taxonomy and organism information before assuming that an entry represents the protein from a particular species.
- Entry names are particularly useful when studying conserved proteins across organisms. A researcher can compare entry names alongside accession numbers, gene names, protein names, and sequences to understand which records correspond to related proteins.
- However, sequence similarity should not be inferred solely from similar entry names. Two proteins may have similar names but different sequences or functions, while homologous proteins from different organisms may have different entry names. Researchers should examine the protein sequence, domains, annotations, and evidence when determining biological relationships.
- The relationship between entry names and Swiss-Prot is also important. Reviewed Swiss-Prot records have historically used mnemonic entry names associated with manually curated protein records. These names can provide a convenient way to recognize proteins that have undergone expert annotation and review.
- TrEMBL entries also have entry names, but their annotations are primarily generated computationally until the records receive appropriate manual review. Therefore, an entry name itself should not be interpreted as evidence that a protein has been experimentally characterized.
- The distinction between reviewed and unreviewed entries is better determined from the UniProtKB reviewed status than from the entry name. Researchers should examine the record status and evidence associated with the annotation rather than assuming that a familiar-looking entry name represents experimentally confirmed protein function.
- UniProt entry names are especially useful when reading older biological literature. Scientific papers may refer to proteins using historical names, gene symbols, or UniProt mnemonic identifiers. Understanding entry names can help researchers recognize relationships between terminology used in publications and information stored in current UniProtKB records.
- An entry name can also be useful when working with protein datasets. For example, a dataset may contain UniProt accession numbers together with entry names, protein names, gene names, and organism information. Keeping these identifiers separate helps prevent errors when combining datasets from multiple biological databases.
- When performing protein sequence analysis, accession numbers are usually preferable for programmatic identification because they provide a precise reference to UniProtKB records. Entry names can still be retained as descriptive identifiers that make datasets easier for researchers to read.
- The UniProt website allows users to search for protein records using different identifiers and descriptive fields. Depending on the search, researchers can locate entries using accession numbers, entry names, gene names, protein names, organisms, taxonomy, and other information.
- A useful workflow is to begin with a UniProt accession number, open the corresponding entry, and then examine the entry name alongside the recommended protein name, gene name, organism, sequence, and annotation. This provides a clearer understanding of how the protein is identified within UniProtKB.
- UniProt entry names can also be used in computational workflows, but researchers should verify how a particular tool or database handles them. Some external resources may expect accession numbers rather than entry names, while older datasets or scripts may contain mnemonic identifiers.
- When transferring information between databases, cross-references provide an important connection between UniProtKB and external resources. A UniProt entry may link to sequence databases, genome databases, structure databases, pathway resources, protein-family databases, Gene Ontology, literature databases, and other biological resources.
- The accession number generally provides the stronger connection when building long-term database links. Entry names are useful for recognition, but accession numbers are better suited for uniquely identifying the UniProtKB record in many automated workflows.
- UniProt entries can change over time as new evidence is incorporated, sequences are corrected, records are merged or divided, and annotations are improved. Researchers should therefore understand UniProt entry versions and accession history when they need to reproduce an earlier analysis.
- An entry name should not be confused with a sequence identifier from UniParc. UniParc focuses on protein sequence records and maintains sequence histories, while UniProtKB provides protein knowledge and functional annotation. The same sequence may occur in multiple biological database records, making it important to understand which identifier system is being used.
- Similarly, UniRef identifiers represent sequence clusters rather than individual UniProtKB protein entries. A UniRef cluster can contain multiple related sequences, whereas a UniProtKB accession and entry name identify an individual protein record.
- Entry names are also different from PDB identifiers. A PDB identifier refers to an experimentally determined macromolecular structure, while a UniProt entry name refers to a UniProtKB protein record. UniProt cross-references can connect these resources so researchers can move between sequence and structural information.
- The distinction becomes even more important in structural bioinformatics. A protein may have a UniProtKB entry even when no experimentally determined structure is available. Conversely, structural information may exist for a protein or homolog while the UniProtKB record contains additional sequence and functional information.
- In proteomics, researchers may encounter UniProt accession numbers, entry names, gene symbols, peptide sequences, and protein-group identifiers in analysis results. Understanding the difference between these identifiers helps researchers correctly map experimental protein identifications to UniProtKB records.
- In comparative genomics, entry names can help researchers organize proteins from different organisms, but accession numbers and sequence comparisons should be used to establish precise relationships. Similar naming conventions do not necessarily indicate equivalent biological functions.
- In protein annotation, the entry name is only one part of a much larger information record. Functional descriptions, Gene Ontology annotations, catalytic activity, domains, sequence features, subcellular location, post-translational modifications, variants, literature, and evidence provide the biological context behind the identifier.
- The UniProt feature table provides additional information about specific regions and residues within a protein sequence. Researchers can use the entry name to recognize a protein record and then examine features such as signal peptides, transmembrane regions, domains, active sites, binding sites, disulfide bonds, processing sites, and sequence variants.
- UniProt entry names are therefore most useful when combined with other identifiers and annotations. An entry name alone tells the researcher which UniProt mnemonic record is being referenced, while the accession number, organism, sequence, annotation, and evidence provide the information needed to interpret the protein correctly.
- A common mistake is assuming that an entry name is the same as the protein’s official name. It is not. The entry name is a database mnemonic, while the recommended protein name is a biological description maintained as part of the UniProt annotation.
- Another common mistake is using an entry name as a permanent replacement for an accession number. For long-term references, publications, computational pipelines, and database integration, the UniProt accession number is generally the more appropriate identifier.
- A third mistake is assuming that the presence of a UniProt entry means that all information about the protein has been experimentally established. UniProt contains both reviewed and unreviewed entries, and individual annotations can have different levels of evidence. Researchers should always inspect evidence and annotation status.
- For reproducible research, it is useful to record the UniProt accession number together with the relevant entry version or sequence information. This allows researchers to identify the precise database record and, when necessary, investigate how that record has changed over time.
- The UniProt REST API can be used to retrieve protein records programmatically. Researchers developing bioinformatics pipelines can use identifiers such as accession numbers to retrieve sequences and annotations automatically. Entry names may also appear in retrieved datasets and can be retained as useful descriptive identifiers.
- When downloading protein sequences in FASTA format, accession numbers and entry names may appear in the sequence headers. Researchers should examine the header structure carefully before using identifiers in scripts, because different download formats and analysis tools may organize identifiers differently.
- For students, understanding UniProt entry names provides an important foundation for learning database navigation. A student can start with an entry name, confirm the corresponding accession number, identify the organism, examine the protein sequence, and then explore function, domains, sequence features, evidence, structures, and literature.
- For researchers, the practical lesson is simple: use the UniProt accession number when precise record identification is required, and use the UniProt entry name as a convenient mnemonic identifier for recognizing and discussing the protein record.
- UniProt entry names are therefore an important part of the UniProt identification system. They provide a compact way to recognize protein records and complement accession numbers, protein names, gene names, organism information, and other identifiers. Understanding these differences helps researchers navigate UniProtKB more accurately and avoid errors when connecting protein information across databases.
