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PDB 1upk EBI.jpg
Available structures
PDB Ortholog search: PDBe RCSB
Aliases STRADA, LYK5, NY-BR-96, PMSE, STRAD, Stlk, STE20-related kinase adaptor alpha
External IDs MGI: 1919399 HomoloGene: 12448 GeneCards: STRADA
RNA expression pattern
PBB GE LYK5 221554 at fs.png

PBB GE LYK5 52169 at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)


RefSeq (protein)
Location (UCSC) Chr 17: 63.7 – 63.74 Mb Chr 11: 106.16 – 106.2 Mb
PubMed search [1] [2]
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Protein kinase LYK5, also known as LYK5 or STRADα, is a human protein and also denotes the gene encoding it.[3][4]


Endogenous LKB1 and STRADα form a complex in which STRADα activates LKB1, resulting in phosphorylation of both partners. Removal of endogenous LYK5 by small interfering RNA abrogates LKB1-induced G1 phase arrest.[4] STRADα stabilizes LKB1 protein both in vivo and in vitro, and is capable of eliciting multiple axons in mouse embryonic cortical cultured neurons when overexpressed with LKB1. STRADα is highly spliced in vivo, and this is both developmentally regulated and tissue-specific, but the unique functions of the splice variants are not yet understood.[5]

Disease linkage[edit]

Mutations in the LYK5/STRADα gene are associated with polyhydramnios, megalencephaly and symptomatic epilepsy (collectively known as the PMSE syndrome).[6]


STRADα has been shown to interact with LKB1 and MO25.[4][7]


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ "Entrez Gene: LYK5 protein kinase LYK5". 
  4. ^ a b c Baas AF, Boudeau J, Sapkota GP, Smit L, Medema R, Morrice NA, Alessi DR, Clevers HC (June 2003). "Activation of the tumour suppressor kinase LKB1 by the STE20-like pseudokinase STRAD". EMBO J. 22 (12): 3062–72. doi:10.1093/emboj/cdg292. PMC 162144Freely accessible. PMID 12805220. 
  5. ^ Veleva-Rotse BO, Smart JL, Baas AF, Edmonds B, Zhao ZM, Brown A, Klug LR, Hansen K, Reilly G, Gardner AP, Subbiah K, Gaucher EA, Clevers H, Barnes AP (2014). "STRAD pseudokinases regulate axogenesis and LKB1 stability.". Neural Dev. 9 (5). doi:10.1186/1749-8104-9-5. PMID 24594058. /
  6. ^ Puffenberger EG, Strauss KA, Ramsey KE, Craig DW, Stephan DA, Robinson DL, Hendrickson CL, Gottlieb S, Ramsay DA, Siu VM, Heuer GG, Crino PB, Morton DH (July 2007). "Polyhydramnios, megalencephaly and symptomatic epilepsy caused by a homozygous 7-kilobase deletion in LYK5". Brain. 130 (Pt 7): 1929–41. doi:10.1093/brain/awm100. PMID 17522105. 
  7. ^ Boudeau J, Scott JW, Resta N, Deak M, Kieloch A, Komander D, Hardie DG, Prescott AR, van Aalten DM, Alessi DR (Dec 2004). "Analysis of the LKB1-STRAD-MO25 complex". J. Cell. Sci. 117 (Pt 26): 6365–75. doi:10.1242/jcs.01571. PMID 15561763. 

Further reading[edit]