chemistry

Glycan nomenclature

Glycan nomenclature is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Glycan nomenclature rather than just read about it. In short: Glycan nomenclature is the systematic naming of glycans, which are carbohydrate-based polymers made by all living organisms. In general glycans can be represented in (i) text formats, these include commonly used CarbBank, IUPAC name, and several other types; and (ii) symbol formats, these are consisting of Symbol Nomenclature For Glycans and Oxford Notations.

Key takeaways

Glycan nomenclature belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Glycan nomenclature to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Glycan nomenclature from memory before moving on to harder problems.

Reference excerpt

Glycan nomenclature is the systematic naming of glycans, which are carbohydrate-based polymers made by all living organisms. In general glycans can be represented in (i) text formats, these include commonly used CarbBank, IUPAC name, and several other types; and (ii) symbol formats, these are consisting of Symbol Nomenclature For Glycans and Oxford Notations.

History In the beginning of the nineteenth century, names of sugar molecules were derived from their source. For example, glucose were called grape sugar (Traubenzucker), saccharose were called cane sugar (Rohrzucker). In 1838, the name glucose was coined; subsequently in 1866 Kekulé proposed the name 'dextrose' as glucose is dextrorotatory. It was decided by the scientific community that sugars should be named with the ending '-ose', which then was combined with the French word 'cellule' for cell, resulting in the term cellulose. As the empirical composition of monosaccharides can be expressed as Cn(H2O)n, they were termed as ‘carbohydrate’ (French ‘hydrate de carbone’).

Text formats To represent the structural information of glycans more accurate and achieve specific purpose for the community, several unique formats were designed and used in different carbohydrate databases developed through different research groups and organizations.

CarbBank The CarbBank format is originally from CarbBank, a database management system for Complex Carbohydrate structure Database (CCSD). The CarbBank is created by researchers at the Complex Carbohydrate Research Center (CCRC) of University of Georgia. An example of an N-glycan of Man-3-Core F is shown below: In general, this format is human-readable but the vertical bars make it difficult for a computer to parse.

IUPAC IUPAC is the International Union of Pure and Applied Chemistry, and they propose a nomenclature for representing complex carbohydrates called 2-Carb. The IUPAC nomenclature provides three forms to represent the glycans.

Extended form: In this format, a monosaccharide unit is represented by a given symbol, after the anomeric descriptor and the configuration symbol. An italic letter is used to represent the ring size, e.g. f for furanose and p for pyranose. The parentheses between the symbols is used to provide locants of the linkage and a double-headed arrow is used to show a linkage between two anomeric positions. Condensed form: This format eliminated both the configurational symbol and the letter denoting ring size. In general, the configuration is D (except for fucose and iduronic acid that are generally in L configuration) and the rings are in pyranose form (unless explicitly mentioned as in other form). The parentheses is used to write the anomeric descriptor along with the locants. Short form: It is usually desirable to shorten the notation by eliminating the anomeric carbon atoms locants, the parentheses around the locants of the linkage, and the hyphens. Moreover, branches can be shown on the same line with the aid of appropriate enclosing marks including parentheses and square brackets. The above example glycan can be represented as below: Extended form: α-D-Manp-(1→3)-[α-D-Manp-(1→6)]- β-D-Manp-(1→4)- β-D-GlcpNAc-(1→4)-[ α-L-Fucp-(1→6)]- β-D-GlcpNAc-(1→NASN-protein Condensed form: Man(α1-3)[Man(α1-6)]Man(β1-4)GlcNAc(β1-4)[Fuc(α1-6)]GlcNAc(β1-ASN Short form: Manα3(Manα6)Manβ4GlcNAcβ4(Fucα6)GlcNAcβASN Note: Modified Condensed IUPAC: Manα1-3(Manα1-6)Manβ1-4GlcNAcβ1-4(Fucα1-6)GlcNAcβ1-Asn

LINUCS Linear Notation for Unique description of Carbohydrate Sequences (LINUCS) is a format used in Glycosciences.de Archived 2021-02-11 at the Wayback Machine. This format is targeted to describe the glycan structure unique Archived 2021-11-12 at the Wayback Machine. The glycan example in LINUCS format could be:

Linear Code Linear Code is a linear notation proposed by GlycoMinds Ltd. and is one of the most compact formats. Here, (i) the common monosaccharides are indicated by a maximum two letter code, (ii) linkages are indicated by “a” or “b” for anomers, (iii) the number are at the end carbon number linkage, and (iv) The branches are indicated by parentheses.

GlycoCT GlycoCT is the format designed and developed under the EuroCarbDB project. This format uses connection table approach to describe the full complexity of carbohydrate sequence data. It is widely used by the bioinformatics community through the database GlycomeDB. A GlycoCT format of the example glycan is shown below:

WURCS The Web3 Unique Representation of Carbohydrate Structures (WURCS) format is initially developed for GlyTouCan, the international glycan structure repository. As GlyTouCan used the Semantic Web technologies for development, it requires a linear string to represent the glycan. The example glycan in WURCS format as below:

KCF The KEGG Chemical Function (KCF) is designed and used in Kyoto Encyclopedia of Genes and Genomes (KEGG) database. It also uses a connection table approach. The example glycan in KCF format as below:

CSDB Linear Carbohydrate Structure Database (CSDB) includes the Bacterial (BCSDB) and Plant and Fungal (PFCSDB) parts. This database utilizes a connection table for internal storage of structures and the CSDB linear code for input–output.

GLYCAM Condensed GLYCAM Condensed format, as well as GLYCAM format, is provided by GLYCAM-Web, which is produced by the research group of Professor Robert J. Woods in the Complex Carbohydrate Research Center at the University of Georgia in Athens GA.

Glyde and Glyde II The GLYcan Data Exchange (GLYDE) format, is an XML-based representation format for glycomics data. It was a part of the Integrated Technology Resources for Biomedical Glycomics, which established by a team from Complex Carbohydrate Research Center of University of Georgia.GLYDE II, is the successor of GLYDE to overcome the limitations of GLYDE, uses a connection table approach.

CabosML A carbohydrate sequence markup language (CabosML) is a description of carbohydrate structures using XML.

Symbol formats Many glycobiologists use figures to depict the complex glycan structures. Currently, there are two major ways to represent glycans using symbols: Symbol Nomenclature For Glycans (SNFG) and Oxford Notation.

Symbol nomenclature For Glycans

Oxford notation The Oxford Notation was designed and developed by the researchers from Oxford Glycobiology Institute at University of Oxford in 2009.

… excerpt ends here. Continue reading the full article.

Illustrations

Glycan nomenclature: Oxford Glycobiology Institute (UOXF) Notation of Man-3-Core F — Oxford Glycobiology Institute (UOXF) Notation of Man-3-Core F

Worked examples

Example 1 — a first encounter with Glycan nomenclature

Start with the simplest possible case. Write down what Glycan nomenclature claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Glycan nomenclature before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Glycan nomenclature ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Glycan nomenclature

In research: Glycan nomenclature appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Glycan nomenclature in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Glycan nomenclature is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carbohydrate chemistry, Glycomics, Oligosaccharides, so understanding it makes those chapters shorter.
In everyday life: Look for Glycan nomenclature outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Glycan nomenclature in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Glycan nomenclature means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Glycan nomenclature out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Glycan nomenclature in simple terms?

Why does Glycan nomenclature matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Glycan nomenclature?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Glycan nomenclature.