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Protein kinase C zeta type - Wikipedia
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Protein kinase C zeta type

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Protein kinase C, zeta (PKCζぜーた), also known as PRKCZ, is a protein in humans that is encoded by the PRKCZ gene. The PRKCZ gene encodes at least two alternative transcripts, the full-length PKCζぜーた and an N-terminal truncated form PKMζぜーた. PKMζぜーた is thought to be responsible for maintaining long-term memories in the brain.[5] The importance of PKCζぜーた in the creation and maintenance of long-term potentiation was first described by Todd Sacktor and his colleagues at the SUNY Downstate Medical Center in 1993.[6]

PRKCZ
Identifiers
AliasesPRKCZ, PKC-ZETA, PKC2, protein kinase C zeta
External IDsOMIM: 176982; MGI: 97602; HomoloGene: 55681; GeneCards: PRKCZ; OMA:PRKCZ - orthologs
Orthologs
SpeciesHumanMouse
Entrez

5590

18762

Ensembl

ENSG00000067606

ENSMUSG00000029053

UniProt

Q05513

Q02956

RefSeq (mRNA)

NM_001039079
NM_008860
NM_001355178

RefSeq (protein)

NP_001034168
NP_032886
NP_001342107

Location (UCSC)Chr 1: 2.05 – 2.19 MbChr 4: 155.34 – 155.45 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Structure

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PKC-zeta has an N-terminal regulatory domain, followed by a hinge region and a C-terminal catalytic domain. Second messengers stimulate PKCs by binding to the regulatory domain, translocating the enzyme from cytosol to membrane, and producing a conformational change that removes auto-inhibition of the PKC catalytic protein kinase activity. PKM-zeta, a brain-specific isoform of PKC-zeta generated from an alternative transcript, lacks the regulatory region of full-length PKC-zeta and is therefore constitutively active.[7]

PKMζぜーた is the independent catalytic domain of PKCζぜーた and, lacking an autoinhibitory regulatory domain of the full-length PKCζぜーた, is constitutively and persistently active, without the need of a second messenger. It was originally thought of as being a cleavage product of full-length PKCζぜーた, an atypical isoform of protein kinase C (PKC). Like other PKC isoforms, PKCζぜーた is a serine/threonine kinase that adds phosphate groups to target proteins. It is atypical in that unlike other PKC isoforms, PKCζぜーた does not require calcium or diacylglycerol (DAG) to become active, but rather relies on a different second messenger, presumably generated through a phosphoinositide 3-kinase (PI3-kinase) pathway. It is now known that PKMζぜーた is not the result of cleavage of full-length PKCζぜーた, but rather, in the mammalian brain, is translated from its own brain-specific mRNA, that is transcribed by an internal promoter within the PKCζぜーた gene.[7] The promoter for full-length PKCζぜーた is largely inactive in the forebrain and so PKMζぜーた is the dominant form of ζぜーた in the forebrain and the only PKM that is translated from its own mRNA.

Function

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PKCζぜーた

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Atypical PKC (aPKC) isoforms [zeta (this enzyme) and lambda/iota] play important roles in insulin-stimulated glucose transport. Human adipocytes contain PKC-zeta, rather than PKC-lambda/iota, as their major aPKC. Inhibition of the PKCζぜーた enzyme inhibits insulin-stimulated glucose transport while activation of PKCζぜーた increases glucose transport.[8]

PKMζぜーた

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PKMζぜーた is thought to be responsible for maintaining the late phase of long-term potentiation (LTP).[9][10][11][12] LTP is one of the major cellular mechanisms that are widely considered to underlie learning and memory.[13] This theory arose from the observation that PKMζぜーた perfused into neurons causes synaptic potentiation, and selective inhibitors of PKMζぜーた like zeta inhibitory peptide (ZIP), when bath applied one hour after tetanization, inhibit the late phase or maintenance of LTP. Thus, PKMζぜーた was thought to be both necessary and sufficient for maintaining LTP. Subsequent work showed that inhibiting PKMζぜーた reversed LTP maintenance when applied up to 5 hours after LTP was induced in hippocampal slices, and after 22 hours in vivo. Inhibiting PKMζぜーた in behaving animals erased spatial long-term memories in the hippocampus that were up to one month old, without affecting spatial short-term memories,[11] and erased long-term memories for fear conditioning and inhibitory avoidance in the basolateral amygdala.[14] When ZIP was injected into rats' sensorimotor cortices, it erased muscle memories for a task, even after several weeks of training.[15] PKMζぜーた may form a self-perpetuating, positive feedback loop that can persist for months to maintain very long-term memories.[5]

In the neocortex, thought to be the site of storage for most long-term memories, PKMζぜーた inhibition erased associative memories for conditioned taste aversion in the insular cortex, up to 3 months after training.[16][17] The protein also seems to be involved, through the nucleus accumbens, in the consolidation and reconsolidation of the memory related to drug addiction.[18] Although results from PKCζぜーた/PKMζぜーた-null mice demonstrate LTP and memory appear largely the same as wild-type mice,[19][20] the normal function of PKMζぜーた in LTP and long-term memory storage was shown to be compensated by the other atypical PKC isoform, PKCιいおた/λらむだ in the knock-out.[21][22][23]

Alteration in PKMζぜーた may be involved in neurodegeneration Alzheimer's disease.[24]

Inhibitors

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  • 1,3,5-Trisubstituted Pyrazolines[25]

Interactions

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PRKCZ has been shown to interact with:

References

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  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000067606 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000029053 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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  6. ^ Sacktor TC, Osten P, Valsamis H, Jiang X, Naik MU, Sublette E (1993). "Persistent activation of the zeta isoform of protein kinase C in the maintenance of long-term potentiation". Proceedings of the National Academy of Sciences of the United States of America. 90 (18): 8342–8346. Bibcode:1993PNAS...90.8342S. doi:10.1073/pnas.90.18.8342. PMC 47352. PMID 8378304.
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Further reading

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  • Slater SJ, Ho C, Stubbs CD (2003). "The use of fluorescent phorbol esters in studies of protein kinase C-membrane interactions". Chem. Phys. Lipids. 116 (1–2): 75–91. doi:10.1016/S0009-3084(02)00021-X. PMID 12093536.
  • Carter CA, Kane CJ (2005). "Therapeutic potential of natural compounds that regulate the activity of protein kinase C". Curr. Med. Chem. 11 (21): 2883–902. doi:10.2174/0929867043364090. PMID 15544481.
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