C9K1M8 · ACT21_ALTAL

Function

function

Abhydrolase domain-containing protein; part of the gene clusters that mediate the biosynthesis of the host-selective toxins (HSTs) ACT-toxins responsible for brown spot of tangerine disease by the tangerine pathotype which affects tangerines and mandarins (PubMed:18944496, PubMed:18986255).
ACT-toxins consist of three moieties, 9,10-epoxy-8-hydroxy-9-methyl-decatrienoic acid (EDA), valine and a polyketide (PubMed:22846083).
ACT-toxin I is toxic to both citrus and pear; toxin II the 5''-deoxy derivative of ACT-toxin I, is highly toxic to pear and slightly toxic to citrus (PubMed:22846083).
On cellular level, ACT-toxins affect plasma membrane of susceptible cells and cause a sudden increase in loss of K+ after a few minutes of toxin treatment (PubMed:22846083).
The acyl-CoA ligase ACTT1, the hydrolase ACTT2, the enoyl-CoA hydratases ACTT3 and ACTT6, and the acyl-CoA synthetase ACTT5 are all involved in the biosynthesis of the AK-, AF- and ACT-toxin common 9,10-epoxy-8-hydroxy-9-methyl-decatrienoic acid (EDA) structural moiety (PubMed:18944496, PubMed:18986255, PubMed:19271978).
The exact role of each enzyme, and of additional enzymes identified within the AF-toxin clusters have still to be determined (PubMed:18944496, PubMed:18986255, PubMed:19271978).
On the other hand, ACTTS1 to ACTTS4 are specific to the tangerine pathotype (PubMed:22846083).
The function of ACTTS3 is to elongate the polyketide chain portion of ACT-toxin that is unique to this toxin (PubMed:20192828).
The enoyl-reductase ACTTS2 might complement the missing enoyl-reductase (ER) domain in ACTTS3 in the synthesis of the polyketide portion of ACT-toxin (PubMed:20055645).
The roles of the nonribosomal peptide synthetases-related proteins ACTTS1 and ACTTS4 have also still not been elucidated (PubMed:22846083).

Miscellaneous

Gene clusters encoding host-selective toxins (HSTs) are localized on conditionally dispensable chromosomes (CDCs), also called supernumerary chromosomes, where they are present in multiple copies (PubMed:18986255).
The CDCs are not essential for saprophytic growth but controls host-selective pathogenicity (PubMed:18986255).
Although conventional disruption of ACTT2 could not be accomplished due to the high number of the copies identified in the genome, the high sequence identity among these copies of ACTT2 is likely an advantage for RNA silencing, because it allows knockdown of all copies of this gene simultaneously (PubMed:18986255).

Pathway

Mycotoxin biosynthesis.

GO annotations

AspectTerm
Cellular Componentperoxisome
Molecular Functionhydrolase activity

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Abhydrolase domain-containing protein ACTT2-1
  • EC number
  • Alternative names
    • ACT-toxin biosynthesis protein 2-1

Gene names

    • Name
      ACTT2-1

Organism names

Accessions

  • Primary accession
    C9K1M8

Organism-specific databases

Subcellular Location

Peroxisome
Note: The peroxisomal location requires the C-terminal tripeptide peroxisomal targeting signal.

Keywords

Phenotypes & Variants

Disruption phenotype

Abolishes the production of ACT-toxin and impairs the formation of lesions on leaves sprayed with conidia (PubMed:18986255).
Does not affect growth rate of cultures, sporulation, and spore germination (PubMed:18986255).

PTM/Processing

Features

Showing features for chain.

TypeIDPosition(s)Description
ChainPRO_00004448271-262Abhydrolase domain-containing protein ACTT2-1

Expression

Induction

Expression is positively regulated by CSN5 during infection.

Structure

Family & Domains

Features

Showing features for motif.

TypeIDPosition(s)Description
Motif260-262Peroxisomal targeting signal type 1

Sequence similarities

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    262
  • Mass (Da)
    29,575
  • Last updated
    2009-11-24 v1
  • Checksum
    71046A3D943826A7
MQQPIVGVGHSMGGCQIATLSVTSRRIFSTMILLDPAIGPPEMGLATLGLGQLTLRRRTQWLTREDAEKALRTSFSTWDPQVLDLLIKHSIHSDKQSVEMEDGPVSLVTGRYQELVNYIKPSFIRSGKVVGQELVHQTGPVDMYHMLGLVTCSTLYLCGGESTLSTPRARELWLSRTAELSYSKDPGEMRKVDERIVPDTGHFLPMEEPKECADIIADWIDKDECMIWNCHIGKQGNIWRDLSNTNRKMNAEVWIEYLQSKL

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AB432915
EMBL· GenBank· DDBJ
BAI44322.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
We'd like to inform you that we have updated our Privacy Notice to comply with Europe’s new General Data Protection Regulation (GDPR) that applies since 25 May 2018.
Help