PAK4

Last updated
PAK4
Protein PAK4 PDB 2bva.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases PAK4 , p21 (RAC1) activated kinase 4
External IDs OMIM: 605451; MGI: 1917834; HomoloGene: 4300; GeneCards: PAK4; OMA:PAK4 - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_027470

RefSeq (protein)

NP_001014831
NP_001014832
NP_001014834
NP_001014835
NP_005875

NP_081746

Location (UCSC) Chr 19: 39.13 – 39.18 Mb Chr 7: 28.26 – 28.3 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Serine/threonine-protein kinase PAK 4 is an enzyme that in humans is encoded by the PAK4 gene. [5] [6] [7]

PAK4 is one of six members of the PAK family of serine/threonine kinases which are divided into group I (PAK1, PAK2 and PAK3) and group II (PAK4, PAK6 and PAK5/7). [8] [9] PAK4 localizes in sub-cellular domains of the cytoplasm and nucleus. [8] [10] [11] PAK4 regulates cytoskeleton remodeling, phenotypic signaling and gene expression, and affects directional motility, invasion, metastasis, and growth. [12] Similar to PAK1, PAK4-signaling-dependent cellular functions also regulate both physiologic and disease processes such as cancer, as PAK4 is overexpressed and/or hyperstimulated in human cancer, at-large. [13] [14]

Discovery

PAK4, the founding member of Group II PAK member, was cloned and identified by Minden A. and colleagues in 1998 using a PCR-based strategy from a cDNA library prepared from Jurkett cells. [8]

Gene and spliced variants

The group II PAKs have less coding exons compared with group I PAKs, highlights the potential structural and functional differences between two group of PAKs. The human PAK4 is about 57-kb in length with 13 exons. The PAK4 generates 12 transcripts of which 10 coding transcripts are predicted to code proteins of about 438 to 591 amino acids long, while remaining two transcripts are non-coding in nature. In contrast to human PAK4, murine PAK4 contains four transcripts - two coding for 593 amino acids long polypeptides and two are non-coding RNA transcripts.

Protein domains

The core domains of PAK4 include, a kinase domain in the C-terminal region, a p21-binding domain (PBD), and a newly defined auto-inhibitory domain (AID) [15] or an AID-like pseudosubstrate sequence (PS) domain. [16]

Regulation

PAK4 activity is stimulated by upstream activators and signals, including by HGF, [17] PKD, [18] [19] PKA, [20] CDK5RAP3, [21] and SH3RF2. [22]

In addition to other mechanisms, PAK4 functions are mediated though phosphorylation of its effector proteins, including, LIMK1-Thr508, [23] integrin β5-Ser759/Ser762, [24] p120-catenin-Ser288, [25] superior cervical ganglia 10 (SCG10)-Ser50, [26] GEF-H1-Ser810 [11] [27] β-catenin-Ser675, [10] and Smad2-Ser465. [28]

PAK4 and/or PAK4-dependent signals also modulate the expression of genomic targets, including p57Kip2. [29]

Inhibitors

The PAK4 activity and expression has been shown to be inhibited by chemical inhibitors such as PF-3758309, [30] LCH-7749944, [31] glaucarubinone, [32] KY-04031, [33] KY-04045, [34] 1-phenanthryl-tetrahydroisoquinoline derivatives, [35] (-)-β-hydrastine, [36] Inka1, [37] GL-1196, [38] GNE-2861, [39] and microRNAs such as miR-145, [40] miR-433, [41] and miR-126. [42]

Function

PAK proteins, a family of serine/threonine p21-activating kinases, include PAK1, PAK2, PAK3 and PAK4. PAK proteins are critical effectors that link Rho GTPases to cytoskeleton reorganization and nuclear signaling. They serve as targets for the small GTP binding proteins Cdc42 and Rac and have been implicated in a wide range of biological activities. PAK4 interacts specifically with the GTP-bound form of Cdc42Hs and weakly activates the JNK family of MAP kinases. PAK4 is a mediator of filopodia formation and may play a role in the reorganization of the actin cytoskeleton. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [7] PAK4 has been shown to be repressed at translational level by miR-24. [43]

PAK4 regulates cellular processes by its scaffolding activity and/or by phosphorylation of effector substrates, which in-turn, set-up a cascades of biochemical events cumulating into a cellular phenotypic response. Examples of PAK4-regulated cellular processes include, dynamic reorganization of actin, [23] and microtubule fibers, [26] anchorage-independent growth, [44] filopodium formation, [8] and cell motility.

Interactions

PAK4 has been shown to interact with:

Notes

Related Research Articles

<span class="mw-page-title-main">Cyclin-dependent kinase</span> Class of enzymes

Cyclin-dependent kinases (CDKs) are a predominant group of serine/threonine protein kinases involved in the regulation of the cell cycle and its progression, ensuring the integrity and functionality of cellular machinery. These regulatory enzymes play a crucial role in the regulation of eukaryotic cell cycle and transcription, as well as DNA repair, metabolism, and epigenetic regulation, in response to several extracellular and intracellular signals. They are present in all known eukaryotes, and their regulatory function in the cell cycle has been evolutionarily conserved. The catalytic activities of CDKs are regulated by interactions with CDK inhibitors (CKIs) and regulatory subunits known as cyclins. Cyclins have no enzymatic activity themselves, but they become active once they bind to CDKs. Without cyclin, CDK is less active than in the cyclin-CDK heterodimer complex. CDKs phosphorylate proteins on serine (S) or threonine (T) residues. The specificity of CDKs for their substrates is defined by the S/T-P-X-K/R sequence, where S/T is the phosphorylation site, P is proline, X is any amino acid, and the sequence ends with lysine (K) or arginine (R). This motif ensures CDKs accurately target and modify proteins, crucial for regulating cell cycle and other functions. Deregulation of the CDK activity is linked to various pathologies, including cancer, neurodegenerative diseases, and stroke.

p21 Protein

p21Cip1, also known as cyclin-dependent kinase inhibitor 1 or CDK-interacting protein 1, is a cyclin-dependent kinase inhibitor (CKI) that is capable of inhibiting all cyclin/CDK complexes, though is primarily associated with inhibition of CDK2. p21 represents a major target of p53 activity and thus is associated with linking DNA damage to cell cycle arrest. This protein is encoded by the CDKN1A gene located on chromosome 6 (6p21.2) in humans.

<span class="mw-page-title-main">STAT3</span> Protein-coding gene in humans

Signal transducer and activator of transcription 3 (STAT3) is a transcription factor which in humans is encoded by the STAT3 gene. It is a member of the STAT protein family.

<span class="mw-page-title-main">ASK1</span> Protein-coding gene in the species Homo sapiens

Apoptosis signal-regulating kinase 1 (ASK1) also known as mitogen-activated protein kinase 5 (MAP3K5) is a member of MAP kinase family and as such a part of mitogen-activated protein kinase pathway. It activates c-Jun N-terminal kinase (JNK) and p38 mitogen-activated protein kinases in a Raf-independent fashion in response to an array of stresses such as oxidative stress, endoplasmic reticulum stress and calcium influx. ASK1 has been found to be involved in cancer, diabetes, rheumatoid arthritis, cardiovascular and neurodegenerative diseases.

<span class="mw-page-title-main">Cyclin D1</span> Protein found in humans

Cyclin D1 is a protein that in humans is encoded by the CCND1 gene.

<span class="mw-page-title-main">RELA</span> Protein-coding gene in the species Homo sapiens

Transcription factor p65 also known as nuclear factor NF-kappa-B p65 subunit is a protein that in humans is encoded by the RELA gene.

<span class="mw-page-title-main">MAPK14</span> Protein-coding gene in the species Homo sapiens

Mitogen-activated protein kinase 14, also called p38-α, is an enzyme that in humans is encoded by the MAPK14 gene.

<span class="mw-page-title-main">PAK1</span> Mammalian protein found in Homo sapiens

Serine/threonine-protein kinase PAK 1 is an enzyme that in humans is encoded by the PAK1 gene.

<span class="mw-page-title-main">PAK2</span> Mammalian protein found in Homo sapiens

Serine/threonine-protein kinase PAK 2 is an enzyme that in humans is encoded by the PAK2 gene.

<span class="mw-page-title-main">DNA damage-inducible transcript 3</span> Human protein and coding gene

DNA damage-inducible transcript 3, also known as C/EBP homologous protein (CHOP), is a pro-apoptotic transcription factor that is encoded by the DDIT3 gene. It is a member of the CCAAT/enhancer-binding protein (C/EBP) family of DNA-binding transcription factors. The protein functions as a dominant-negative inhibitor by forming heterodimers with other C/EBP members, preventing their DNA binding activity. The protein is implicated in adipogenesis and erythropoiesis and has an important role in the cell's stress response.

<span class="mw-page-title-main">PIM1</span> Protein-coding gene in the species Homo sapiens

Proto-oncogene serine/threonine-protein kinase Pim-1 is an enzyme that in humans is encoded by the PIM1 gene.

<span class="mw-page-title-main">PAK3</span> Mammalian protein found in Homo sapiens

PAK3 is one of three members of Group I PAK family of evolutionary conserved serine/threonine kinases. PAK3 is preferentially expressed in neuronal cells and involved in synapse formation and plasticity and mental retardation.

<span class="mw-page-title-main">GADD45G</span> Protein-coding gene in the species Homo sapiens

Growth arrest and DNA-damage-inducible protein GADD45 gamma is a protein that in humans is encoded by the GADD45G gene on chromosome 9. GADD45G is also known as CR6, DDIT2, GRP17, OIG37, and GADD45gamma. GADD45G is involved in several different processes, including sexual development, human-specific brain development, tumor suppression, and the cellular stress response. GADD45G interacts with several other proteins that are involved in DNA repair, cell cycle control, apoptosis, and senescence. Low expression of GADD45G has been associated with many types of cancer.

<span class="mw-page-title-main">STRAP</span> Protein-coding gene in the species Homo sapiens

Serine-threonine kinase receptor-associated protein is an enzyme that in humans is encoded by the STRAP gene.

<span class="mw-page-title-main">MAP4K4</span> Protein-coding gene in the species Homo sapiens

Mitogen-activated protein kinase kinase kinase kinase 4 (MAP4K4) – also known as hepatocyte progenitor kinase-like/germinal center kinase-like kinase (HGK) and Nck-interacting kinase (NIK) – is an enzyme, specifically a serine/threonine (S/T) kinase encoded by the MAP4K4 gene in humans.

<span class="mw-page-title-main">PAK5</span>

Serine/threonine-protein kinase PAK 5 is an enzyme that in humans is encoded by the PAK5 gene.

<span class="mw-page-title-main">PAK6</span>

Serine/threonine-protein kinase PAK 6 is an enzyme that in humans is encoded by the PAK6 gene.

<span class="mw-page-title-main">Rho-associated protein kinase</span>

Rho-associated protein kinase (ROCK) is a kinase belonging to the AGC family of serine-threonine specific protein kinases. It is involved mainly in regulating the shape and movement of cells by acting on the cytoskeleton.

<span class="mw-page-title-main">Autophosphorylation</span>

Autophosphorylation is a type of post-translational modification of proteins. It is generally defined as the phosphorylation of the kinase by itself. In eukaryotes, this process occurs by the addition of a phosphate group to serine, threonine or tyrosine residues within protein kinases, normally to regulate the catalytic activity. Autophosphorylation may occur when a kinases' own active site catalyzes the phosphorylation reaction, or when another kinase of the same type provides the active site that carries out the chemistry. The latter often occurs when kinase molecules dimerize. In general, the phosphate groups introduced are gamma phosphates from nucleoside triphosphates, most commonly ATP.

mTOR Complex 2 (mTORC2) is an acutely rapamycin-insensitive protein complex formed by serine/threonine kinase mTOR that regulates cell proliferation and survival, cell migration and cytoskeletal remodeling. The complex itself is rather large, consisting of seven protein subunits. The catalytic mTOR subunit, DEP domain containing mTOR-interacting protein (DEPTOR), mammalian lethal with sec-13 protein 8, and TTI1/TEL2 complex are shared by both mTORC2 and mTORC1. Rapamycin-insensitive companion of mTOR (RICTOR), mammalian stress-activated protein kinase interacting protein 1 (mSIN1), and protein observed with rictor 1 and 2 (Protor1/2) can only be found in mTORC2. Rictor has been shown to be the scaffold protein for substrate binding to mTORC2.

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