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SS4
Arabidopsis thaliana · Probable starch synthase 4, chloroplastic/amyloplastic (EC 2.4.1.21)
GT5Model organism · annotation ≥ 4Fold GT-BRetaining1 PDB structure(s)
External resources
Identification and annotation
| CAZy family | GT5 · CAZy entry |
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| Gene symbol | SS4 |
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| Synonyms / alternate names | Soluble starch synthase IV |
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| UniProt accession | Q0WVX5 |
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| NCBI Gene ID | 827550 |
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| Source species | Arabidopsis thaliana |
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| Taxonomic domain | Eukaryota |
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| UniProt annotation level | 5 |
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Function and localisation
| Enzyme function | Probable starch synthase 4, chloroplastic/amyloplastic (EC 2.4.1.21) |
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| Subcellular location | - Plastid, chloroplast
- Plastid, amyloplast
- Plastid, chloroplast stroma
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Structure and mechanism
| Fold type | GT-B |
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| Catalytic mechanism | Retaining |
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| Cation dependence | No |
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| Oligomeric state | Interacts with PTST2 (PubMed:28684429). Interacts with PII1; |
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| PDB structures | 6GNE |
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Donor and acceptor specificity
| Sugar nucleotide donor | ADP-alpha-D-glucose |
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| Donor CCD code(s) | ADQ |
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| Acceptor substrate(s) | [(1->4)-alpha-D-glucosyl](n) |
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| Acceptor CCD / GlycoCT | not curated |
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Protein sequences
Full protein sequence
1040 aa
MTTKLSSFCFLTHGLAGISCEREHGSSRRFFYLPSRRLVSTSCKMRQQRGFDSSKRQEVKKGSPKPILSINSGLQSNNDEESDLENGSADSVPSLKSDAEKGSSIHGSIDMNHADENLEKKDDIQTTEVTRRKSKTAKKKGESIHATIDIGHDDGKNLDNITVPEVAKALSLNKSEGEQISDGQFGELMTMIRSAEKNILRLDEARATALDDLNKILSDKEALQGEINVLEMKLSETDERIKTAAQEKAHVELLEEQLEKLRHEMISPIESDGYVLALSKELETLKLENLSLRNDIEMLKSELDSVKDTGERVVVLEKECSGLESSVKDLESKLSVSQEDVSQLSTLKIECTDLWAKVETLQLLLDRATKQAEQAVIVLQQNQDLRNKVDKIEESLKEANVYKESSEKIQQYNELMQHKVTLLEERLEKSDAEIFSYVQLYQESIKEFQETLESLKEESKKKSRDEPVDDMPWDYWSRLLLTVDGWLLEKKIASNDADLLRDMVWKKDRRIHDTYIDVKDKNERDAISAFLKLVSSPTSSGLYVVHIAAEMAPVAKVGGLGDVVAGLGKALQRKGHLVEIILPKYDCMQYDRVRDLRALDTVVESYFDGKLYKNKIWIGTVEGLPVHFIEPQHPSKFFWRGQFYGEQDDFRRFSYFSRAALELLLQSGKKPDIIHCHDWQTAFVAPLYWDLYAPKGLDSARICFTCHNFEYQGTASASELGSCGLDVNQLNRPDRMQDHSSGDRVNPVKGAIIFSNIVTTVSPTYAQEVRTAEGGKGLHSTLNFHSKKFIGILNGIDTDSWNPATDPFLKAQFNAKDLQGKEENKHALRKQLGLSSAESRRPLVGCITRLVPQKGVHLIRHAIYRTLELGGQFVLLGSSPVPHIQREFEGIEQQFKSHDHVRLLLKYDEALSHTIYAASDLFIIPSIFEPCGLTQMIAMRYGSIPIARKTGGLNDSVFDIDDDTIPTQFQNGFTFQTADEQGFNYALERAFNHYKKDEEKWMRLVEKVMSIDFSWGSSATQYEELYTRSVSRARAVPNRT
Catalytic domain sequence
486 aa
YVVHIAAEMAPVAKVGGLGDVVAGLGKALQRKGHLVEIILPKYDCMQYDRVRDLRALDTVVESYFDGKLYKNKIWIGTVEGLPVHFIEPQHPSKFFWRGQFYGEQDDFRRFSYFSRAALELLLQSGKKPDIIHCHDWQTAFVAPLYWDLYAPKGLDSARICFTCHNFEYQGTASASELGSCGLDVNQLNRPDRMQDHSSGDRVNPVKGAIIFSNIVTTVSPTYAQEVRTAEGGKGLHSTLNFHSKKFIGILNGIDTDSWNPATDPFLKAQFNAKDLQGKEENKHALRKQLGLSSAESRRPLVGCITRLVPQKGVHLIRHAIYRTLELGGQFVLLGSSPVPHIQREFEGIEQQFKSHDHVRLLLKYDEALSHTIYAASDLFIIPSIFEPCGLTQMIAMRYGSIPIARKTGGLNDSVFDIDDDTIPTQFQNGFTFQTADEQGFNYALERAFNHYKKDEEKWMRLVEKVMSIDFSWGSSATQYEELYTR
