DCL1

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Endoribonuclease Dicer homolog 1
Cartoon representation of Arabidopsis DCL1 in complex with pri-miRNA 166f. Single chain of DCL1 in light purple catalyzing the cleavage of pri-miRNA-166f into pre-miRNA-166f, before one more cleavage step to finally release miRNA-166f.
Identifiers
OrganismArabidopsis thaliana
SymbolDCL1
Alt. symbolsAT1G01040
UniProt
Q9SP32
Other data
EC numberEC:3.1.26
Chromosome1: 0.02 - 0.03 Mb
Search for
StructuresSwiss-model
DomainsInterPro

DCL1 (an abbreviation of Dicer-like 1) is a

metazoan protein Dicer, its role in miRNA biogenesis is somewhat different, due to substantial differences in miRNA maturation processes between plants and animals,[2] as well due to additional downstream plant-specific pathways, where DCL1 paralogs like DCL4 participate, such Trans-acting siRNA
biogenesis.

Function

DCL1 is localized exclusively in the plant

primary miRNA to a pre-miRNA, and for then processing the pre-miRNA to a mature miRNA.[4][5] In animals, the equivalents of these two steps are carried out by different proteins; First, pri-miRNA processing takes place in the nucleus by the ribonuclease Drosha as part of the Microprocessor complex. Second and finally processing to a mature miRNA takes place in the cytoplasm by Dicer to yield a mature miRNA.[2]

PAZ domain plasticity

A model for DCL1-HYL-SE scaffolding for the pri-miRNA to pre-miRNA maturation process, as well for the pre-miRNA to miRNA maturation step helped by CARP9 binding into the DICER-Complex [3]

In animals, hairpin-containing primary transcripts (pri-miRNAs) are cleaved by Drosha to generate precursor-miRNAs, a double strand palindromic structure typically call hairpin pre-miRNAs, which are subsequently cleaved by Dicer to generate mature miRNAs. Instead of being cleaved by two different enzymes, both cleavages in plants are performed by Dicer-like 1 (DCL1), despite of a similar domain architecuture between both homologgous enzymes.[5] Recent single-particle cryo-electron microscopy structures of both complexs of dsRNA structures (pri-RNA and pre-miRNA) as ligand of Arabidopsis DCL1, in cleavege-competent state, suggest that PAZ domain plasticity allow its to get involved in pri-miRNA and pre-miRNA recognition, posibilited by an internal loop binding groove of this protein domain, which serves as an engine that transfers the substrate between two sequential cleavage events.[5]

Other dicer-like proteins

Although DCL1 is responsible for the majority of the miRNA processing in plants, most plants contain an additional set of DCLs proteins with related roles in RNA processing,

paralog genes to DLC1, DCL2, DCL3, DCL4 and two RNASE II-LIKE genes RTL1 and RTL2;[7][8] Howeversome dicots such as Populus trichocarpa[9] as well the majority of monocots plants have five to six DCLs, where DCL2 and DCL3 suffered an additional duplication into the genes DCL2a and DCL2. DCL3's duplication is monocot-specifict, generating the genes DCL3a and DCL3b, also called DCL3 and DCL5 respectively.[10][7]

References

  1. PMID 12417148
    .
  2. ^
    PMID 21554756
    .
  3. ^
    PMID 32636339
    .
  4. S2CID 12544460
    .
  5. ^
    S2CID 238240098
    .
  6. PMID 25376953
    .
  7. ^
    ISSN 2296-701X
    .
  8. PMID 24214956
    .
  9. PMID 31729948
    .
  10. PMID 35380679
    .


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