Summary: Ankyrin repeat

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Ankyrin repeat Edit Wikipedia article

Ankyrin repeat domain

Ribbon diagram of a fragment of the membrane-binding domain of ankyrin R.^[1]

Identifiers

Symbol

Ank

Available protein structures:
Pfam	structures
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

The ankyrin repeat is a 33-residue motif in proteins consisting of two alpha helices separated by loops, first discovered in signaling proteins in yeast Cdc10 and Drosophila Notch. Domains consisting of ankyrin repeats mediate protein-protein interactions and are among the most common structural motifs in known proteins. They appear in bacterial, archaeal, and eukaryotic proteins, but are far more common in eukaryotes. Ankyrin repeat proteins, though absent in most viruses, are common among poxviruses. Most proteins that contain the motif have four to six repeats, although its namesake ankyrin contains 24, and the largest known number of repeats is 34, predicted in a protein expressed by Giardia lamblia.^[2]

Ankyrin repeats typically fold together to form a single, linear solenoid structure called ankyrin repeat domains. These domains are one of the most common protein–protein interaction platforms in nature. They occur in a large number of functionally diverse proteins, mainly from eukaryotes. The few known examples from prokaryotes and viruses may be the result of horizontal gene transfers.^[3] The repeat has been found in proteins of diverse function such as transcriptional initiators, cell cycle regulators, cytoskeletal, ion transporters, and signal transducers. The ankyrin fold appears to be defined by its structure rather than its function, since there is no specific sequence or structure that is universally recognised by it.

Role in protein folding[edit]

The ankyrin-repeat sequence motif has been studied using multiple sequence alignment to determine which conserved amino acid residues are critical for folding and stability. The residues that appear on the wide lateral surface of ankyrin repeat structures are variable, often hydrophobic, and involved mainly in mediating protein–protein interactions. An artificial protein design based on a consensus sequence derived from sequence alignment has been synthesized and found to fold stably, representing the first designed protein with multiple identical repeats.^[4] More extensive design strategies have used combinatorial sequences to "evolve" ankyrin-repeat motifs that specifically recognize particular protein targets, a technique that has been presented as a possible alternative to antibody design for applications requiring high-affinity binding.^[5]

Ankyrin-repeat proteins present an unusual problem in the study of protein folding, which has largely focused on globular proteins that form well-defined tertiary structure stabilized by long-range, nonlocal residue-residue contacts. Ankyrin repeats, by contrast, contain very few such contacts (that is, they have a low contact order). Most studies have found that ankyrin repeats fold in a two-state folding mechanism, suggesting a high degree of folding cooperativity despite the local inter-residue contacts and the evident need for successful folding with varying numbers of repeats. Some evidence, based on synthesis of truncated versions of natural repeat proteins,^[6] and on the examination of phi values,^[7] suggests that the C-terminus forms the folding nucleation site.

Clinical significance[edit]

Ankyrin-repeat proteins have been associated with a number of human diseases. These proteins include the cell cycle inhibitor p16, which is associated with cancer, and the Notch protein (a key component of cell signalling pathways) which can cause the neurological disorder CADASIL when the repeat domain is disrupted by mutations.^[2]

A specialized family of ankyrin proteins known as muscle ankyrin repeat proteins (MARPs) are involved with the repair and regeneration of muscle tissue following damage due to injury and stress.^[8]

A natural variation between glutamine and lysine at position 703 in the 11th ankyrin repeat of ANKK1, known as the TaqI A1 allele,^[9] has been credited with encouraging addictive behaviours such as obesity, alcoholism, nicotine dependency and the Eros love style^{[citation needed]} while discouraging juvenile delinquency and neuroticism-anxiety.^[10]^{[not in citation given]} The variation may affect the specificity of protein interactions made by the ANKK1 protein kinase through this repeat^{[citation needed]}.

Human proteins containing this repeat[edit]

ABTB1; ABTB2; ACBD6; ACTBL1; ANK1; ANK2; ANK3; ANKAR; ANKDD1A; ANKEF1; ANKFY1; ANKHD1; ANKIB1; ANKK1; ANKMY1; ANKMY2; ANKRA2; ANKRD1; ANKRD10; ANKRD11; ANKRD12; ANKRD13; ANKRD13A; ANKRD13B; ANKRD13C; ANKRD13D; ANKRD15; ANKRD16; ANKRD17; ANKRD18A; ANKRD18B; ANKRD19; ANKRD2; ANKRD20A1; ANKRD20A2; ANKRD20A3; ANKRD20A4; ANKRD21; ANKRD22; ANKRD23; ANKRD25; ANKRD26; ANKRD27; ANKRD28; ANKRD30A; ANKRD30B; ANKRD30BL; ANKRD32; ANKRD33; ANKRD35; ANKRD36; ANKRD36B; ANKRD37; ANKRD38; ANKRD39; ANKRD40; ANKRD41; ANKRD42; ANKRD43; ANKRD44; ANKRD45; ANKRD46; ANKRD47; ANKRD49; ANKRD50; ANKRD52; ANKRD53; ANKRD54; ANKRD55; ANKRD56; ANKRD57; ANKRD58; ANKRD60; ANKRD6; ANKRD7; ANKRD9; ANKS1A; ANKS3; ANKS4B; ANKS6; ANKZF1; ASB1; ASB10; ASB11; ASB12; ASB13; ASB14; ASB15; ASB16; ASB2; ASB3; ASB4; ASB5; ASB6; ASB7; ASB8; ASB9; ASZ1; BARD1; BAT4; BAT8; BCL3; BCOR; BCORL1; BTBD11; CAMTA1; CAMTA2; CASKIN1; CASKIN2; CCM1; CDKN2A; CDKN2B; CDKN2C; CDKN2D; CENTB1; CENTB2; CENTB5; CENTG1; CENTG2; CENTG3; CLIP3; CLIP4; CLPB; CTGLF1; CTGLF2; CTGLF3; CTGLF4; CTGLF5; CTTNBP2; DAPK1; DDEF1; DDEF2; DDEFL1; DGKI; DGKZ; DP58; DYSFIP1; DZANK; EHMT1; EHMT2; ESPN; FANK1; FEM1A; FEM1B; GABPB2; GIT1; GIT2; GLS; GLS2; HACE1; HECTD1; IBTK; ILK; INVS; KIDINS220; KRIT1; LRRK1; MAIL; MIB1; MIB2; MPHOSPH8; MTPN; MYO16; NFKB1; NFKB2; NFKBIA; NFKBIB; NFKBIE; NFKBIL1; NFKBIL2; NOTCH1; NOTCH2; NOTCH3; NOTCH4; NRARP; NUDT12; OSBPL1A; OSTF1; PLA2G6; POTE14; POTE15; POTE8; PPP1R12A; PPP1R12B; PPP1R12C; PPP1R13B; PPP1R13L; PPP1R16A; PPP1R16B; PSMD10; RAI14; RFXANK; RIPK4; RNASEL; SHANK1; SHANK2; SHANK3; SNCAIP; TA-NFKBH; TEX14; TNKS; TNKS2; TNNI3K; TP53BP2; TRP7; TRPA1; TRPC3; TRPC4; TRPC5; TRPC6; TRPC7; TRPV1; TRPV2; TRPV3; TRPV4; TRPV5; TRPV6; UACA; USH1G; ZDHHC13; ZDHHC17;

References[edit]

^ PDB 1N11; Michaely P, Tomchick DR, Machius M, Anderson RG (December 2002). "Crystal structure of a 12 ANK repeat stack from human ANK1". EMBO J. 21 (23): 6387–96. doi:10.1093/emboj/cdf651. PMC 136955. PMID 12456646.
^ ^a ^b Mosavi L, Cammett T, Desrosiers D, Peng Z (2004). "The ankyrin repeat as molecular architecture for protein recognition". Protein Sci 13 (6): 1435–48. doi:10.1110/ps.03554604. PMC 2279977. PMID 15152081.
^ Bork P (December 1993). "Hundreds of ankyrin-like repeats in functionally diverse proteins: mobile modules that cross phyla horizontally?". Proteins 17 (4): 363–74. doi:10.1002/prot.340170405. PMID 8108379.
^ Mosavi LK, Minor DL, Peng ZY (Dec 2002). "Consensus-derived structural determinants of the ankyrin repeat motif". Proc Natl Acad Sci USA. 99 (25): 16029–34. Bibcode:2002PNAS...9916029M. doi:10.1073/pnas.252537899. PMC 138559. PMID 12461176.
^ Binz HK, Amstutz P, Kohl A, et al. (May 2004). "High-affinity binders selected from designed ankyrin repeat protein libraries". Nat Biotechnol. 22 (5): 575–82. doi:10.1038/nbt962. PMID 15097997.
^ Zhang B, Peng Z (Jun 2000). "A minimum folding unit in the ankyrin repeat protein p16(INK4)". J Mol Biol. 299 (4): 1121–32. doi:10.1006/jmbi.2000.3803. PMID 10843863.
^ Tang KS, Fersht AR, Itzhaki LS (Jan 2003). "Sequential unfolding of ankyrin repeats in tumor suppressor p16". Structure 11 (1): 67–73. doi:10.1016/S0969-2126(02)00929-2. PMID 12517341.
^ Miller MK, Bang ML, Witt CC, et al. (Nov 2003). "The muscle ankyrin repeat proteins: CARP, ankrd2/Arpp and DARP as a family of titin filament-based stress response molecules". J Mol Biol. 333 (5): 951–64. doi:10.1016/j.jmb.2003.09.012. PMID 14583192.
^ Neville MJ, Johnstone EC, Walton RT (Jun 2004). "Identification and characterization of ANKK1: a novel kinase gene closely linked to DRD2 on chromosome band 11q23.1". Hum Mutat. 23 (6): 540–5. doi:10.1002/humu.20039. PMID 15146457.
^ "NCBI Gene summary for DRD2". (interim reference)

External links[edit]

Eukaryotic Linear Motif resource motif class LIG_TNKBM_1
Ankyrin repeat at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the public domain Pfam and InterPro IPR002110

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

Ankyrin repeat Provide feedback

Ankyrins are multifunctional adaptors that link specific proteins to the membrane-associated, spectrin- actin cytoskeleton. This repeat-domain is a 'membrane-binding' domain of up to 24 repeated units, and it mediates most of the protein's binding activities. Repeats 13-24 are especially active, with known sites of interaction for the Na/K ATPase, Cl/HCO(3) anion exchanger, voltage-gated sodium channel, clathrin heavy chain and L1 family cell adhesion molecules. The ANK repeats are found to form a contiguous spiral stack such that ion transporters like the anion exchanger associate in a large central cavity formed by the ANK repeat spiral, while clathrin and cell adhesion molecules associate with specific regions outside this cavity [2].

Literature references

Lux SE, John KM, Bennett V; , Nature 1990;345:736-739.: Hereditary spherocytosis associated with deletion of human erythrocyte ankyrin gene on chromosome 8. PUBMED:2141669 EPMC:2141669
Michaely P, Tomchick DR, Machius M, Anderson RG;, EMBO J. 2002;21:6387-6396.: Crystal structure of a 12 ANK repeat stack from human ankyrinR. PUBMED:12456646 EPMC:12456646
Michaely P, Bennett V;, Trends Cell Biol. 1992;2:127-129.: The ANK repeat: a ubiquitous motif involved in macromolecular recognition. PUBMED:14731966 EPMC:14731966

External database links

HOMSTRAD:	ANK
MIM:	182900
PANDIT:	PF00023
Pseudofam:	PF00023
SCOP:	1awc
SYSTERS:	Ank

This tab holds annotation information from the InterPro database.

InterPro entry IPR002110

The ankyrin repeat is one of the most common protein-protein interaction motifs in nature. Ankyrin repeats are tandemly repeated modules of about 33 amino acids. They occur in a large number of functionally diverse proteins mainly from eukaryotes. The few known examples from prokaryotes and viruses may be the result of horizontal gene transfers [PUBMED:8108379]. The repeat has been found in proteins of diverse function such as transcriptional initiators, cell-cycle regulators, cytoskeletal, ion transporters and signal transducers. The ankyrin fold appears to be defined by its structure rather than its function since there is no specific sequence or structure which is universally recognised by it.

The conserved fold of the ankyrin repeat unit is known from several crystal and solution structures [PUBMED:8875926, PUBMED:9353127, PUBMED:9461436, PUBMED:9865693]. Each repeat folds into a helix-loop-helix structure with a beta-hairpin/loop region projecting out from the helices at a 90^o angle. The repeats stack together to form an L-shaped structure [PUBMED:8875926, PUBMED:12461176].

Gene Ontology

The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.

Molecular function

protein binding (GO:0005515)

Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

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Pfam Clan

This family is a member of clan Ank (CL0465), which has the following description:

The ankyrin repeat is a short sequence region that is about 30-34 amino-acids in length. Multiple copies of the repeat composed of two beta strands and two alpha helices combine to form long arrays. In general these repeats are involved in protein-protein interactions. This superfamily also includes some families that are arrays of several repeats.

The clan contains the following 7 members:

Ank Ank_2 Ank_3 Ank_4 Ank_5 DUF3420 DUF3447

Alignments

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 using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the NCBI sequence database, and our metagenomics 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.

Alignment types

We make a range of alignments for each Pfam-A family:

seed: the curated alignment from which the HMM for the family is built
full: the alignment generated by searching the sequence database using the HMM
RP15/RP35/RP55/RP75: Representative Proteomes (RPs) at 15%, 35%, 55% and 75% co-membership thresholds
NCBI: alignment generated by searching the NCBI sequence database using the family HMM
meta: alignment generated by searching the metagenomics sequence database using the family HMM

Viewing

You can see the alignments as HTML or in three different sequence viewers:

jalview: a Java applet developed at the University of Dundee. You will need Java installed before running jalview
HTML: an HTML page showing the whole alignment.Please note: full Pfam alignments can be very large. These HTML views are extremely large and often cause problems for browsers. Please use either jalview or the Pfam viewer if you have trouble viewing the HTML version
PP/Heatmap: an HTML-based representation of the alignment, coloured according to the posterior-probability (PP) values from the HMM. As for the standard HTML view, heatmap alignments can also be very large and slow to render.
Pfam viewer: an HTML-based viewer that uses DAS to retrieve alignment fragments on request

Reformatting

You can download (or view in your browser) a text representation of a Pfam alignment in various formats:

Selex
Stockholm
FASTA
MSF

You can also change the order in which sequences are listed in the alignment, change how insertions are represented, alter the characters that are used to represent gaps in sequences and, finally, choose whether to download the alignment or to view it in your browser directly.

Downloading

You may find that large alignments cause problems for the viewers and the reformatting tool, so we also provide all alignments in Stockholm format. You can download either the plain text alignment, or a gzipped version of it.

View options

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.

	Seed (1072)	Full (8812)	Representative proteomes				NCBI (139773)	Meta (9187)
	Seed (1072)	Full (8812)	RP15 (2564)	RP35 (3256)	RP55 (4303)	RP75 (5230)	NCBI (139773)	Meta (9187)
Jalview	View	View	View	View	View	View	View	View
HTML	View		View	View	View
PP/heatmap	₁		View	View	View
Pfam viewer	View	View

¹Cannot generate PP/Heatmap alignments for seeds; no PP data available

Key: available, not generated, — not available.

Format an alignment

	Seed (1072)	Full (8812)	Representative proteomes				NCBI (139773)	Meta (9187)
	Seed (1072)	Full (8812)	RP15 (2564)	RP35 (3256)	RP55 (4303)	RP75 (5230)	NCBI (139773)	Meta (9187)
Alignment:
Format:
Order:	Tree Alphabetical
Sequence:	Inserts lower case All upper case
Gaps:
Download/view:	Download View

Download options

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.

	Seed (1072)	Full (8812)	Representative proteomes				NCBI (139773)	Meta (9187)
	Seed (1072)	Full (8812)	RP15 (2564)	RP35 (3256)	RP55 (4303)	RP75 (5230)	NCBI (139773)	Meta (9187)
Raw Stockholm	Download	Download	Download	Download	Download	Download	Download	Download
Gzipped	Download	Download	Download	Download	Download	Download	Download	Download

You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

External links

MyHits provides a collection of tools to handle multiple sequence alignments. For example, one can refine a seed alignment (sequence addition or removal, re-alignment or manual edition) and then search databases for remote homologs using HMMER3.

HMM logo

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...

Trees

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.

Curation

Seed source:

Swissprot_feature_table

Previous IDs:

ank;

Type:

Repeat

Author:

Bateman A, Sonnhammer ELL

Number in seed:

1072

Number in full:

8812

Average length of the domain:

32.40 aa

Average identity of full alignment:

29 %

Average coverage of the sequence by the domain:

5.11 %

HMM information

HMM build commands:

build method: hmmbuild -o /dev/null HMM SEED

search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq

Model details:

Parameter	Sequence	Domain
Gathering cut-off	20.6	14.7
Trusted cut-off	20.6	14.7
Noise cut-off	20.5	14.6

Model length:

33

Family (HMM) version:

25

Download:

download the raw HMM for this family

Species distribution

Sunburst
Tree

Sunburst controls

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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 adjacent tab. 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:

superkingdom
kingdom
phylum
class
order
family
genus
species

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".

Sub-species

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.

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Tree controls

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The tree shows the occurrence of this domain across different species. More...

Species trees

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.

Interactive tree

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:

show/hide the summary boxes
highlight species that are represented in the seed alignment
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Interactions

There are 7 interactions for this family. More...

Ank Pkinase ArfGap RHD P53 SH3_1 TIG

Structures

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 Ank domain has been found. There are 214 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 seqence.

Loading structure mapping...

Archea	Eukaryota
Bacteria	Other sequences
Viruses	Unclassified
Viroids	Unclassified sequence

Family: Ank (PF00023)

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