Summary: Fructosamine kinase
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This is the Wikipedia entry entitled "Fructosamine kinase family". More...
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Fructosamine kinase family Edit Wikipedia article
In molecular biology the fructosamine kinase family is a family of enzymes. This family includes eukaryotic fructosamine-3-kinase enzymes which may initiate a process leading to the deglycation of fructoselysine and of glycated proteins and in the phosphorylation of 1-deoxy-1-morpholinofructose, fructoselysine, fructoseglycine, fructose and glycated lysozyme. The family also includes ketosamine-3-kinases (KT3K). Ketosamines derive from a non-enzymatic reaction between a sugar and a protein. Ketosamine-3-kinases (KT3K) catalyse the phosphorylation of the ketosamine moiety of glycated proteins. The instability of a phosphorylated ketosamine leads to its degradation, and KT3K is thus thought to be involved in protein repair.
The function of the prokaryotic members of this group has not been established. However, several lines of evidence indicate that they may function as fructosamine-3-kinases (FN3K). First, they are similar to characterised FN3K from mouse and human. Second, the Escherichia coli members are found in close proximity on the genome to fructose-6-phosphate kinase (PfkB). Last, FN3K activity has been found in the blue-green algae Anacystis montana indicating such activity-directly demonstrated in eukaryotes-is nonetheless not confined to eukaryotes.
- Delpierre G, Rider MH, Collard F, Stroobant V, Vanstapel F, Santos H, Van Schaftingen E (October 2000). "Identification, cloning, and heterologous expression of a mammalian fructosamine-3-kinase". Diabetes. 49 (10): 1627–34. doi:10.2337/diabetes.49.10.1627. PMID 11016445.
- Armbruster DA (December 1987). "Fructosamine: structure, analysis, and clinical usefulness". Clin. Chem. 33 (12): 2153–63. PMID 3319287.
- Collard F, Delpierre G, Stroobant V, Matthijs G, Van Schaftingen E (December 2003). "A mammalian protein homologous to fructosamine-3-kinase is a ketosamine-3-kinase acting on psicosamines and ribulosamines but not on fructosamines". Diabetes. 52 (12): 2888–95. doi:10.2337/diabetes.52.12.2888. PMID 14633848.
- Delvalle JA, Asensio C (August 1978). "Distribution of adenosine 5'-triphosphate (ATP)-dependent hexose kinases in microorganisms". BioSystems. 10 (3): 265–82. doi:10.1016/0303-2647(78)90008-4. PMID 214181.
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Fructosamine kinase Provide feedback
This family includes eukaryotic fructosamine-3-kinase enzymes . The family also includes bacterial members that have not been characterised but probably have a similar or identical function.
Delpierre G, Rider MH, Collard F, Stroobant V, Vanstapel F, Santos H, Van Schaftingen E; , Diabetes 2000;49:1627-1634.: Identification, cloning, and heterologous expression of a mammalian fructosamine-3-kinase. PUBMED:11016445 EPMC:11016445
Internal database links
|SCOOP:||APH APH_6_hur Choline_kinase DUF1679 EcKL PK_Tyr_Ser-Thr Pkinase TCAD9|
|Similarity to PfamA using HHSearch:||APH|
This tab holds annotation information from the InterPro database.
InterPro entry IPR016477
Ketosamines derive from a non-enzymatic reaction between a sugar and a protein [ PUBMED:3319287 ]. Ketosamine-3-kinases (KT3K), of which fructosamine-3-kinase (FN3K) is the best-known example, catalyse the phosphorylation of the ketosamine moiety of glycated proteins. The instability of a phosphorylated ketosamine leads to its degradation, and KT3K is thus thought to be involved in protein repair [ PUBMED:14633848 ].
The function of the prokaryotic members of this group has not been established. However, several lines of evidence indicate that they may function as fructosamine-3-kinases (FN3K). First, they are similar to characterised FN3K from mouse and human. Second, the Escherichia coli members are found in close proximity on the genome to fructose-6-phosphate kinase (PfkB). Last, FN3K activity has been found in a Anacystis montana (Gloeocapsa montana Kutzing 1843) [ PUBMED:214181 ], indicating such activity-directly demonstrated in eukaryotes-is nonetheless not confined to eukaryotes.
This family includes eukaryotic fructosamine-3-kinase enzymes [ PUBMED:11016445 ] which may initiate a process leading to the deglycation of fructoselysine and of glycated proteins and in the phosphorylation of 1-deoxy-1-morpholinofructose, fructoselysine, fructoseglycine, fructose and glycated lysozyme. The family also includes bacterial members that have not been characterised but probably have a similar or identical function.
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
The graphic that is shown by default represents the longest sequence with a given architecture. Each row contains the following information:
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a textual description of the architecture, e.g. Gla, EGF x 2, Trypsin.
This example describes an architecture with one
Gladomain, followed by two consecutive
EGFdomains, and finally a single
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This superfamily includes the Serine/Threonine- and Tyrosine- protein kinases as well as related kinases that act on non-protein substrates.
The clan contains the following 40 members:ABC1 AceK_kinase Act-Frag_cataly Alpha_kinase APH APH_6_hur Choline_kinase CotH DUF1679 DUF2252 DUF4135 DUF5898 EcKL Fam20C Fructosamin_kin FTA2 Haspin_kinase HipA_C Ins_P5_2-kin IPK IucA_IucC Kdo Kinase-like Kinase-PolyVal KIND Pan3_PK PI3_PI4_kinase PIP49_C PIP5K PK_Tyr_Ser-Thr Pkinase Pkinase_fungal Pox_ser-thr_kin RIO1 Seadorna_VP7 TCAD9 UL97 WaaY YrbL-PhoP_reg YukC
We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets and the UniProtKB sequence database. More...
There are various ways to view or download the sequence alignments that we store. We provide several sequence viewers and a plain-text Stockholm-format file for download.
We make a range of alignments for each Pfam-A family:
- the curated alignment from which the HMM for the family is built
- the alignment generated by searching the sequence database using the HMM
- Representative Proteomes (RPs) at 15%, 35%, 55% and 75% co-membership thresholds
- alignment generated by searching the UniProtKB sequence database using the family HMM
You can see the alignments as HTML or in three different sequence viewers:
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We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.
1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
Format an alignment
We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.
You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.
HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...
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This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.
Note: You can also download the data file for the tree.
Curation and family details
This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.
|Number in seed:||23|
|Number in full:||5078|
|Average length of the domain:||263.40 aa|
|Average identity of full alignment:||27 %|
|Average coverage of the sequence by the domain:||86.79 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 61295632 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||17|
|Download:||download the raw HMM for this family|
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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the More....
This chart is a modified "sunburst" visualisation of the species tree for this family. It shows each node in the tree as a separate arc, arranged radially with the superkingdoms at the centre and the species arrayed around the outermost ring.
How the sunburst is generated
The tree is built by considering the taxonomic lineage of each sequence that has a match to this family. For each node in the resulting tree, we draw an arc in the sunburst. The radius of the arc, its distance from the root node at the centre of the sunburst, shows the taxonomic level ("superkingdom", "kingdom", etc). The length of the arc represents either the number of sequences represented at a given level, or the number of species that are found beneath the node in the tree. The weighting scheme can be changed using the sunburst controls.
In order to reduce the complexity of the representation, we reduce the number of taxonomic levels that we show. We consider only the following eight major taxonomic levels:
Colouring and labels
Segments of the tree are coloured approximately according to their superkingdom. For example, archeal branches are coloured with shades of orange, eukaryotes in shades of purple, etc. The colour assignments are shown under the sunburst controls. Where space allows, the name of the taxonomic level will be written on the arc itself.
As you move your mouse across the sunburst, the current node will be highlighted. In the top section of the controls panel we show a summary of the lineage of the currently highlighed node. If you pause over an arc, a tooltip will be shown, giving the name of the taxonomic level in the title and a summary of the number of sequences and species below that node in the tree.
Anomalies in the taxonomy tree
There are some situations that the sunburst tree cannot easily handle and for which we have work-arounds in place.
Missing taxonomic levels
Some species in the taxonomic tree may not have one or more of the main eight levels that we display. For example, Bos taurus is not assigned an order in the NCBI taxonomic tree. In such cases we mark the omitted level with, for example, "No order", in both the tooltip and the lineage summary.
Unmapped species names
The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.
So that these nodes are not simply omitted from the sunburst tree, we group them together in a separate branch (or segment of the sunburst tree). Since we cannot determine the lineage for these unmapped species, we show all levels between the superkingdom and the species as "uncategorised".
Since we reduce the species tree to only the eight main taxonomic levels, sequences that are mapped to the sub-species level in the tree would not normally be shown. Rather than leave out these species, we map them instead to their parent species. So, for example, for sequences belonging to one of the Vibrio cholerae sub-species in the NCBI taxonomy, we show them instead as belonging to the species Vibrio cholerae.
Too many species/sequences
For large species trees, you may see blank regions in the outer layers of the sunburst. These occur when there are large numbers of arcs to be drawn in a small space. If an arc is less than approximately one pixel wide, it will not be drawn and the space will be left blank. You may still be able to get some information about the species in that region by moving your mouse across the area, but since each arc will be very small, it will be difficult to accurately locate a particular species.
The tree shows the occurrence of this domain across different species. More...
We show the species tree in one of two ways. For smaller trees we try to show an interactive representation, which allows you to select specific nodes in the tree and view them as an alignment or as a set of Pfam domain graphics.
Unfortunately we have found that there are problems viewing the interactive tree when the it becomes larger than a certain limit. Furthermore, we have found that Internet Explorer can become unresponsive when viewing some trees, regardless of their size. We therefore show a text representation of the species tree when the size is above a certain limit or if you are using Internet Explorer to view the site.
If you are using IE you can still load the interactive tree by clicking the "Generate interactive tree" button, but please be aware of the potential problems that the interactive species tree can cause.
For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.
We also count the number of unique sequences on which each domain is found, which is shown in green. Note that a domain may appear multiple times on the same sequence, leading to the difference between these two numbers.
Finally, we group sequences from the same organism according to the NCBI code that is assigned by UniProt, allowing us to count the number of distinct sequences on which the domain is found. This value is shown in the pink boxes.
We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.
You can use the tree controls to manipulate how the interactive tree is displayed:
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Please note: for large trees this can take some time. While the tree is loading, you can safely switch away from this tab but if you browse away from the family page entirely, the tree will not be loaded.
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Fructosamin_kin domain has been found. There are 5 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein sequence.
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AlphaFold Structure Predictions
The list of proteins below match this family and have AlphaFold predicted structures. Click on the protein accession to view the predicted structure.