Summary for HK4 (NES ID: 318)

Full Name
Hexokinase-4     UniProt    
Alternative Names
Glucokinase (GCK), Hexokinase type IV, Hexokinase-D   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
Unknown
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
E300Q/K (enhanced activity), V302E, R303W, L304P, L306A/L307A/L309A Ref.1Functional characterization of MODY2 mutations in the nuclear export signal of glucokinase., Nogues et al., Biochim Biophys Acta Mol Basis Dis, 2018 Ref.2Nuclear import of hepatic glucokinase depends upon glucokinase regulatory protein, whereas export is due to a nuclear export signal sequence in glucokinase, Shiota et al., J Biol Chem, 1999
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
Undetermined
Secondary Structure of Export Signal
alpha-helix
Other Residues Important for Export
Unknown
Sequence
Show FASTA Format Show Domain Info by CDD Show Secondary Structure by PSIPRED Show Conservation Score by AL2CO 
        10         20         30         40         50         60 
MLDDRARMEA AKKEKVEQIL AEFQLQEEDL KKVMRRMQKE MDRGLRLETH EEASVKMLPT 

        70         80         90        100        110        120 
YVRSTPEGSE VGDFLSLDLG GTNFRVMLVK VGEGEEGQWS VKTKHQMYSI PEDAMTGTAE 

       130        140        150        160        170        180 
MLFDYISECI SDFLDKHQMK HKKLPLGFTF SFPVRHEDID KGILLNWTKG FKASGAEGNN 

       190        200        210        220        230        240 
VVGLLRDAIK RRGDFEMDVV AMVNDTVATM ISCYYEDHQC EVGMIVGTGC NACYMEEMQN 

       250        260        270        280        290        300 
VELVEGDEGR MCVNTEWGAF GDSGELDEFL LEYDRLVDES SANPGQQLYE KLIGGKYMGE 

       310        320        330        340        350        360 
LVRLVLLRLV DENLLFHGEA SEQLRTRGAF ETRFVSQVES DTGDRKQIYN ILSTLGLRPS 

       370        380        390        400        410        420 
TTDCDIVRRA CESVSTRAAH MCSAGLAGVI NRMRESRSED VMRITVGVDG SVYKLHPSFK 

       430        440        450        460                       
ERFHASVRRL TPSCEITFIE SEEGSGRGAA LVSAVACKKA CMLGQ
3D Structures in PDB
4DCH (X-Ray,1.79 Å resolution)
Comments
Hexokinase-IV (HK4) or gluocokinase is a key regulator of glucose metabolism and is responsible for the phosphorylation of various hexose. Mutations in HK4 are involved in various diseases including Maturity-onset diabetes of the young 2 (MODY2). Putative NES was identified in between 300-310 using the fragment 299-359 which is LMB sensitive. This fragment constitute only part of the domain as seen in X-ray structure and will likely expose regions that are not accessible in full-length protein, including the putative NES. The sequence matches a 1b consensus but contains an excess of hydrophobic residues as spacers. It should be noted that the full length protein does not respond to LMB - Shiota et al. proposed that this is due to its inability to enter the nucleus in the absence of GKBP. Non-alanine mutations listed are MODY2 associated mutations tested in Gutierrez-Nogués et al.
References
[1]. "Functional characterization of MODY2 mutations in the nuclear export signal of glucokinase."
Gutierrez-Nogués A, García-Herrero CM, Oriola J, Vincent O, Navas MA. (2018) Biochim Biophys Acta Mol Basis Dis, 1864(7):2385-2394 PubMed
[2]. "Nuclear import of hepatic glucokinase depends upon glucokinase regulatory protein, whereas export is due to a nuclear export signal sequence in glucokinase"
Shiota C, Coffey J, Grimsby J, Grippo JF, Magnuson MA. (1999) J Biol Chem, 274(52):37125-30 PubMed
User Input
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