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62  structures 2137  species 0  interactions 6105  sequences 87  architectures

Family: Choline_kinase (PF01633)

Summary: Choline/ethanolamine kinase

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This is the Wikipedia entry entitled "Choline/ethanolamine kinase family". More...

Choline/ethanolamine kinase family Edit Wikipedia article

PDB 1nw1 EBI.jpg
crystal structure of choline kinase
Symbol Choline_kinase
Pfam PF01633
Pfam clan CL0016
InterPro IPR002573

In molecular biology, the choline/ethanolamine kinase family includes choline kinase(EC and ethanolamine kinase (EC

Ethanolamine and choline are major membrane phospholipids, in the form of glycerophosphoethanolamine and glycerophosphocholine. Ethanolamine is also a component of the glycosylphosphatidylinositol (GPI) anchor, which is necessary for cell-surface protein attachment.[1] The de novo synthesis of these phospholipids begins with the creation of phosphoethanolamine and phosphocholine by ethanolamine and choline kinases in the first step of the CDP-ethanolamine pathway.[2][3] There are two putative choline/ethanolamine kinases (C/EKs) in the Trypanosoma brucei genome.

Ethanolamine kinase has no choline kinase activity [1] and its activity is inhibited by ADP.[3] Inositol supplementation represses ethanolamine kinase, decreasing the incorporation of ethanolamine into the CDP-ethanolamine pathway and into phosphatidylethanolamine and phosphatidylcholine.[4]


  1. ^ a b Gibellini F, Hunter WN, Smith TK (October 2008). "Biochemical characterization of the initial steps of the Kennedy pathway in Trypanosoma brucei: the ethanolamine and choline kinases". Biochem. J. 415 (1): 135–44. doi:10.1042/BJ20080435. PMC 2552378Freely accessible. PMID 18489261. 
  2. ^ Tian Y, Jackson P, Gunter C, Wang J, Rock CO, Jackowski S (September 2006). "Placental thrombosis and spontaneous fetal death in mice deficient in ethanolamine kinase 2". J. Biol. Chem. 281 (38): 28438–49. doi:10.1074/jbc.M605861200. PMID 16861741. 
  3. ^ a b Kim KH, Voelker DR, Flocco MT, Carman GM (March 1998). "Expression, purification, and characterization of choline kinase, product of the CKI gene from Saccharomyces cerevisiae". J. Biol. Chem. 273 (12): 6844–52. doi:10.1074/jbc.273.12.6844. PMID 9506987. 
  4. ^ Kersting MC, Choi HS, Carman GM (August 2004). "Regulation of the yeast EKI1-encoded ethanolamine kinase by inositol and choline". J. Biol. Chem. 279 (34): 35353–9. doi:10.1074/jbc.M405704200. PMID 15201274. 

This article incorporates text from the public domain Pfam and InterPro IPR002573

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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.

Choline/ethanolamine kinase Provide feedback

Choline kinase catalyses the committed step in the synthesis of phosphatidylcholine by the CDP-choline pathway [1]. This alignment covers the protein kinase portion of the protein. The divergence of this family makes it very difficult to create a model that specifically predicts choline/ethanolamine kinases only. However if [add Pfam ID here for Choline_kinase_C] is also present then it is definitely a member of this family.

Literature references

  1. Kim KH, Voelker DR, Flocco MT, Carman GM; , J Biol Chem 1998;273:6844-6852.: Expression, purification, and characterization of choline kinase, product of the CKI gene from Saccharomyces cerevisiae. PUBMED:9506987 EPMC:9506987

Internal database links

This tab holds annotation information from the InterPro database.

No InterPro data for this Pfam family.

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 PKinase (CL0016), which has the following description:

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 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


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Curation and family details

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Seed source: Pfam-B_1165 (release 4.1)
Previous IDs: none
Type: Family
Sequence Ontology: SO:0100021
Author: Bateman A
Number in seed: 31
Number in full: 6105
Average length of the domain: 195.20 aa
Average identity of full alignment: 24 %
Average coverage of the sequence by the domain: 49.05 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 57096847 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 20.7 20.7
Trusted cut-off 20.7 20.7
Noise cut-off 20.6 20.6
Model length: 213
Family (HMM) version: 22
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Species distribution

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Archea Archea Eukaryota Eukaryota
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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 Choline_kinase domain has been found. There are 62 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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