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Protein

3-oxoacyl-[acyl-carrier-protein] synthase II, chloroplastic

Gene

KAS2

Organism
Arabidopsis thaliana (Mouse-ear cress)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

Essential protein that catalyzes the condensation reaction of fatty acid synthesis by the addition to an acyl acceptor of two carbons from malonyl-ACP. Specific for elongation from C-16 and C-16 to unsaturated C-18 fatty acids. Confers resistance to low temperatures by maintaining chloroplast membranes integrity. Involved in the regulation of fatty acids ratios during seed metabolism. Required for embryo development, especially at the transition from the globular to the heart stage.6 Publications

Catalytic activityi

Acyl-[acyl-carrier-protein] + malonyl-[acyl-carrier-protein] = 3-oxoacyl-[acyl-carrier-protein] + CO2 + [acyl-carrier-protein].1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Active sitei292PROSITE-ProRule annotation1

GO - Molecular functioni

  • 3-oxoacyl-[acyl-carrier-protein] synthase activity Source: TAIR

GO - Biological processi

  • cold acclimation Source: UniProtKB
  • embryo development ending in seed dormancy Source: UniProtKB
  • fatty acid biosynthetic process Source: TAIR
  • unsaturated fatty acid biosynthetic process Source: TAIR

Keywordsi

Molecular functionAcyltransferase, Developmental protein, Transferase
Biological processFatty acid biosynthesis, Fatty acid metabolism, Lipid biosynthesis, Lipid metabolism

Enzyme and pathway databases

BioCyciARA:AT1G74960-MONOMER
ARA:GQT-1583-MONOMER
ARA:MONOMER-14118
MetaCyc:MONOMER-14118
BRENDAi2.3.1.179 399

Names & Taxonomyi

Protein namesi
Recommended name:
3-oxoacyl-[acyl-carrier-protein] synthase II, chloroplastic (EC:2.3.1.41)
Alternative name(s):
Beta-ketoacyl-acyl-carrier-protein synthase II
Short name:
AtKAS2
Short name:
Beta-ketoacyl-ACP synthetase 2
Protein FATTY ACID BIOSYNTHESIS 1
Gene namesi
Name:KAS2
Synonyms:FAB1
Ordered Locus Names:At1g74960
ORF Names:F25A4.7, F9E10.19
OrganismiArabidopsis thaliana (Mouse-ear cress)
Taxonomic identifieri3702 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaerosidsmalvidsBrassicalesBrassicaceaeCamelineaeArabidopsis
Proteomesi
  • UP000006548 Componenti: Chromosome 1

Organism-specific databases

AraportiAT1G74960
TAIRilocus:2027252 AT1G74960

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte; Source: COMPARTMENTS

Keywords - Cellular componenti

Chloroplast, Plastid

Pathology & Biotechi

Disruption phenotypei

Lethal when homozygous due to embryo abortion before the torpedo stage. Converts temperate oilseed composition (rich in unsaturated 18-carbon fatty acids) to that of a palm-like tropical oil (enriched in saturated 16-carbon fatty acids).2 Publications

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Mutagenesisi337L → F in fab1; partial activity deficience due to structural instability and reduced substrate binding affinity, resulting in increased levels of saturated 16:0 but reduced levels of 18:0 fatty acids, particularly in chloroplasts, and associated with damage and death at continuous low temperature (accompanied by chloroplast degenerescence), but not after transient chilling or freezing. 5 Publications1

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transit peptidei1 – 103ChloroplastSequence analysisAdd BLAST103
ChainiPRO_0000406094104 – 5413-oxoacyl-[acyl-carrier-protein] synthase II, chloroplasticAdd BLAST438

Proteomic databases

PaxDbiQ9C9P4
PRIDEiQ9C9P4

Expressioni

Tissue specificityi

Mostly expressed in siliques, and, to a lower extent, in leaves, stems, flower buds, and flowers.1 Publication

Developmental stagei

First observed during the transition from the late globular to the early heart embryo stages. Later observed during heart, tropedo, and cotyledonary embryo stages. In seedlings, observed in the shoot apex and stomatal guard cells. In adult plants, expressed in inflorescences. In flowers, strongly present in styles and pollen grains.1 Publication

Gene expression databases

ExpressionAtlasiQ9C9P4 baseline and differential
GenevisibleiQ9C9P4 AT

Interactioni

Subunit structurei

Homodimer.By similarity

Protein-protein interaction databases

BioGridi29054, 1 interactor
STRINGi3702.AT1G74960.1

Structurei

3D structure databases

ProteinModelPortaliQ9C9P4
SMRiQ9C9P4
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the beta-ketoacyl-ACP synthases family.Curated

Keywords - Domaini

Transit peptide

Phylogenomic databases

eggNOGiKOG1394 Eukaryota
COG0304 LUCA
HOGENOMiHOG000060166
InParanoidiQ9C9P4
KOiK09458
OMAiEACMNIV
OrthoDBiEOG093609PY
PhylomeDBiQ9C9P4

Family and domain databases

Gene3Di3.40.47.10, 2 hits
InterProiView protein in InterPro
IPR017568 3-oxoacyl-ACP_synth-2
IPR018201 Ketoacyl_synth_AS
IPR014031 Ketoacyl_synth_C
IPR014030 Ketoacyl_synth_N
IPR020841 PKS_Beta-ketoAc_synthase_dom
IPR016039 Thiolase-like
PfamiView protein in Pfam
PF00109 ketoacyl-synt, 1 hit
PF02801 Ketoacyl-synt_C, 1 hit
SMARTiView protein in SMART
SM00825 PKS_KS, 1 hit
SUPFAMiSSF53901 SSF53901, 2 hits
TIGRFAMsiTIGR03150 fabF, 1 hit
PROSITEiView protein in PROSITE
PS00606 B_KETOACYL_SYNTHASE, 1 hit

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q9C9P4-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MVGASSSYAS PLCTWFVAAC MSVSHGGGDS RQAVALQSGG RSRRRRQLSK
60 70 80 90 100
CSVASGSASI QALVTSCLDF GPCTHYNNNN ALSSLFGSNS VSLNRNQRRL
110 120 130 140 150
NRAASSGGAM AVMEMEKEAA VNKKPPTEQR RVVVTGMGVE TSLGHDPHTF
160 170 180 190 200
YENLLQGNSG ISQIENFDCS EFPTRIAGEI KSFSTEGWVA PKLSKRMDKF
210 220 230 240 250
MLYLLTAGKK ALADGGVTDE VMAEFDKTKC GVLIGSAMGG MKVFYDAIEA
260 270 280 290 300
LRISYKKMNP FCVPFATTNM GSAMLAMDLG WMGPNYSIST ACATSNFCIL
310 320 330 340 350
NSANHIIKGE ADVMLCGGSD AVIIPIGLGG FVACRALSQR NNDPTKASRP
360 370 380 390 400
WDTNRDGFVM GEGAGVLLLE ELEHAKKRGA TIYAEFLGGS FTCDAYHMTE
410 420 430 440 450
PHPDGAGVIL CIERALASAG ISKEQINYIN AHATSTHAGD IKEYQALAHC
460 470 480 490 500
FGQNPELKVN STKSMIGHLL GAAGAVEAVA TVQAIRTGWV HPNINLENPD
510 520 530 540
SGVDTKLLVG PKKERLDIKA ALSNSFGFGG HNSSIIFAPY K
Length:541
Mass (Da):57,600
Last modified:June 1, 2001 - v1
Checksum:iCB4F87E7B0C82189
GO

Sequence cautioni

The sequence AAD55280 differs from that shown. Reason: Erroneous gene model prediction.Curated
The sequence AAL06498 differs from that shown. Reason: Frameshift at positions 38 and 328.Curated
The sequence AAL06498 differs from that shown. Reason: Erroneous initiation. Translation N-terminally extended.Curated

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti472A → V in AAL91174 (PubMed:14593172).Curated1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF318307 mRNA Translation: AAK69603.1
AC008263 Genomic DNA Translation: AAD55280.1 Sequence problems.
AC013258 Genomic DNA Translation: AAG51920.1
CP002684 Genomic DNA Translation: AEE35655.1
CP002684 Genomic DNA Translation: AEE35656.1
CP002684 Genomic DNA Translation: AEE35657.1
AF412045 mRNA Translation: AAL06498.1 Frameshift.
AF419598 mRNA Translation: AAL31930.1
AY054196 mRNA Translation: AAL06857.1
AY081285 mRNA Translation: AAL91174.1
AY097344 mRNA Translation: AAM19860.1
PIRiD96779
RefSeqiNP_001185400.1, NM_001198471.1
NP_565097.1, NM_106154.4
NP_849888.1, NM_179557.4
UniGeneiAt.26097

Genome annotation databases

EnsemblPlantsiAT1G74960.1; AT1G74960.1; AT1G74960
AT1G74960.2; AT1G74960.2; AT1G74960
AT1G74960.3; AT1G74960.3; AT1G74960
GeneIDi843835
GrameneiAT1G74960.1; AT1G74960.1; AT1G74960
AT1G74960.2; AT1G74960.2; AT1G74960
AT1G74960.3; AT1G74960.3; AT1G74960
KEGGiath:AT1G74960

Similar proteinsi

Entry informationi

Entry nameiKASC2_ARATH
AccessioniPrimary (citable) accession number: Q9C9P4
Secondary accession number(s): Q8RXF5, Q945N5, Q9SSG8
Entry historyiIntegrated into UniProtKB/Swiss-Prot: March 8, 2011
Last sequence update: June 1, 2001
Last modified: April 25, 2018
This is version 116 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. Arabidopsis thaliana
    Arabidopsis thaliana: entries and gene names
  2. SIMILARITY comments
    Index of protein domains and families
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