P93568 (SSY1_SOLTU) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Soluble starch synthase 1, chloroplastic/amyloplastic EC=2.4.1.21 Alternative name(s): Soluble starch synthase I Short name=SS I
Organism	Solanum tuberosum (Potato) [Reference proteome]
Taxonomic identifier	4113 [NCBI]
Taxonomic lineage	cellular organisms › Eukaryota › Viridiplantae › Streptophyta › Streptophytina › Embryophyta › Tracheophyta › Euphyllophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › asterids › lamiids › Solanales › Solanaceae › Solanoideae › Solaneae › Solanum

Protein attributes

Sequence length	641 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Evidence at transcript level

General annotation (Comments)

Function	Plays a minor role in starch synthesis in storage organs (tubers), but may contribute to the deposition of transient starch in chloroplasts of leaves.
Catalytic activity	ADP-glucose + (1,4-alpha-D-glucosyl)(n) = ADP + (1,4-alpha-D-glucosyl)(n+1).
Pathway	Glycan biosynthesis; starch biosynthesis.
Subcellular location	Plastid › chloroplast. Plastid › amyloplast. Note: Amyloplast or chloroplast, soluble.
Tissue specificity	High expression in leaves and very low in tubers.
Induction	Constant expression in light and darkness.
Sequence similarities	Belongs to the glycosyltransferase 1 family. Bacterial/plant glycogen synthase subfamily.

Ontologies

Keywords
Biological process	Starch biosynthesis
Cellular component	Amyloplast Chloroplast Plastid
Domain	Transit peptide
Molecular function	Glycosyltransferase Transferase
Technical term	Complete proteome Reference proteome
Gene Ontology (GO)
Biological_process	starch biosynthetic process Inferred from electronic annotation. Source: UniProtKB-UniPathway
Cellular_component	amyloplast Inferred from electronic annotation. Source: UniProtKB-SubCell chloroplast Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular_function	starch synthase activity Inferred from electronic annotation. Source: EC
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Transit peptide	1 – ?		Chloroplast Potential
	Chain	? – 641		Soluble starch synthase 1, chloroplastic/amyloplastic		PRO_0000011142
Sites
	Binding site	145	1	ADP-glucose By similarity

Sequences

	Sequence		Length	Mass (Da)
	P93568 [UniParc]. Last modified May 1, 1997. Version 1. Checksum: 30F8B0546CEFB74C	FASTA	641	70,608
	10 20 30 40 50 60 MGSLQTPTNL SNKSCLCVSG RVVKGLRVER QVGLGFSWLL KGRRNRKVQS LCVTSSVSDG 70 80 90 100 110 120 SSIAENKNVS EGLLLGAERD GSGSVVGFQL IPHSVAGDAT MVESHDIVAN DRDDLSEDTE 130 140 150 160 170 180 EMEETPIKLT FNIIFVTAEA APYSKTGGLG DVCGSLPMAL AARGHRVMVV SPRYLNGGPS 190 200 210 220 230 240 DEKYANAVDL DVRATVHCFG DAQEVAFYHE YRAGVDWVFV DHSSYCRPGT PYGDIYGAFG 250 260 270 280 290 300 DNQFRFTLLS HAACEAPLVL PLGGFTYGEK CLFLANDWHA ALVPLLLAAK YRPYGVYKDA 310 320 330 340 350 360 RSIVAIHNIA HQGVEPAVTY NNLGLPPQWY GAVEWIFPTW ARAHALDTGE TVNVLKGAIA 370 380 390 400 410 420 VADRILTVSQ GYSWEITTPE GGYGLHELLS SRQSVLNGIT NGIDVNDWNP STDEHIASHY 430 440 450 460 470 480 SINDLSGKVQ CKTDLQKELG LPIRPDCPLI GFIGRLDYQK GVDIILSAIP ELMQNDVQVV 490 500 510 520 530 540 MLGSGEKQYE DWMRHTENLF KDKFRAWVGF NVPVSHRITA GCDILLMPSR FEPCGLNQLY 550 560 570 580 590 600 AMRYGTIPIV HSTGGLRDTV KDFNPYAQEG IGEGTGWTFS PLTSEKLLDT LKLAIGTYTE 610 620 630 640 HKSSWEGLMR RGMGRDYSWE NAAIQYEQVF TWAFIDPPYV R

References

[1]

"Cloning and functional analysis of a cDNA encoding a starch synthase from potato (Solanum tuberosum L.) that is predominantly expressed in leaf tissue." Kossmann J., Abel G.J.W., Springer F., Lloyd J.R., Willmitzer L. Planta 208:503-511(1999) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA]. Strain: cv. Desiree. Tissue: Leaf.

Cross-references

Sequence databases
EMBL GenBank DDBJ	Y10416 mRNA. Translation: CAA71442.1.
PIR	T07668.
3D structure databases
ProteinModelPortal	P93568.
ModBase	Search...
Protein family/group databases
CAZy	GT5. Glycosyltransferase Family 5.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Enzyme and pathway databases
UniPathway	UPA00152.
Family and domain databases
InterPro	IPR001296. Glyco_trans_1. IPR011835. Glycogen/starch_synth. IPR013534. Starch_synth_cat_dom. [Graphical view]
Pfam	PF08323. Glyco_transf_5. 1 hit. PF00534. Glycos_transf_1. 1 hit. [Graphical view]
TIGRFAMs	TIGR02095. glgA. 1 hit.
ProtoNet	Search...

Entry information

Entry name

SSY1_SOLTU

Accession

Primary (citable) accession number: P93568

Entry history

Integrated into UniProtKB/Swiss-Prot:	November 1, 1997
Last sequence update:	May 1, 1997
Last modified:	May 1, 2013
This is version 65 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program