Reviewed, UniProtKB/Swiss-Prot P93253 (SAHH_MESCR)

Names and origin

Protein names

Recommended name:
    Adenosylhomocysteinase
      Short name=AdoHcyase
    EC=3.3.1.1
Alternative name(s):
    S-adenosyl-L-homocysteine hydrolase

Gene names

Name:

SAHH

Organism

Mesembryanthemum crystallinum (Common ice plant)

Taxonomic identifier

3544 [NCBI]

Taxonomic lineage

Eukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › Caryophyllales › Aizoaceae › Mesembryanthemum

Protein attributes

Sequence length	485 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Evidence at transcript level.

General annotation (Comments)

Function	Adenosylhomocysteine is a competitive inhibitor of S-adenosyl-L-methinine-dependent methyl transferase reactions; therefore adenosylhomocysteinase may play a key role in the control of methylations via regulation of the intracellular concentration of adenosylhomocysteine By similarity.
Catalytic activity	S-adenosyl-L-homocysteine + H2O = L-homocysteine + adenosine.
Cofactor	Binds 1 NAD per subunit.
Pathway	Amino-acid biosynthesis; L-homocysteine biosynthesis; L-homocysteine from S-adenosyl-L-homocysteine: step 1/1.
Subunit structure	Homotetramer By similarity.
Sequence similarities	Belongs to the adenosylhomocysteinase family.

Ontologies

Keywords
Biological process	One-carbon metabolism
Ligand	NAD
Molecular function	Hydrolase
Gene Ontology (GO)
Biological process	one-carbon metabolic process Inferred from electronic annotation. Source: UniProtKB-KW
Molecular function	adenosylhomocysteinase activity Inferred from electronic annotation. Source: EC binding Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – 485	485	Adenosylhomocysteinase		PRO_0000116926
Regions
	Region	232 – 401	170	NAD binding By similarity
Sites
	Binding site	64	1	Substrate By similarity
	Binding site	139	1	Substrate By similarity
	Binding site	205	1	Substrate By similarity
	Binding site	235	1	Substrate By similarity
	Binding site	239	1	Substrate By similarity

Sequences

	Sequence		Length	Mass (Da)
	P93253-1 [UniParc]. Last modified May 1, 1997. Version 1. Checksum: 2C3B339BD4F7BAE6	FASTA	485	53,178
	10 20 30 40 50 60 MALAVEKTSS GREYKVKDMS QADFGRLEIE LAEVEMPGLM ACRTEFGPSQ PFKGAKITGS 70 80 90 100 110 120 LHMTIQTAVL IETLTALGAE VRWCSCNIFS TQDHAAAAIA RDSAAVFAWK GETLQEYWWC 130 140 150 160 170 180 TERALDWGAG GGPDLIVDDG GDATLLIHEG VKAEEEYEKN GTIPDPTSTD NPEFQLVLGL 190 200 210 220 230 240 IRDSLKVDPK RYHKMKTRLV GVSEETTTGV KRLYQMQATG TLLFPAINVN DSVTKSKFDN 250 260 270 280 290 300 LYGCRHSLPD GLMRATDVMI AGKVGVVCGY GDVGKGCALA LKAAGARVIV TEIDPICALQ 310 320 330 340 350 360 ALMEGFQILT LEDVVSEADI FVTTTGNKDI IMVDHMRKMK NNAIVCNIGH FDNEIDMLGL 370 380 390 400 410 420 ENYPGVKRIT IKPQTDRFVF PETNTGIIVL AEGRLMKLGC ATGHPSFVMS CSFTNQVIAQ 430 440 450 460 470 480 LELWNERASG KYEKKVYVLP KHLDEKVAAL HLGKLGAKLT KLSKDQADYI SVPVEGPYKP AHYRY

References

[1]	Michalowski C.B., Bohnert H.J. Submitted (NOV-1996) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [MRNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	U79766 mRNA. Translation: AAB38499.1.
3D structure databases
ModBase	Search...
Enzyme and pathway databases
BRENDA	3.3.1.1. 2210.
Family and domain databases
InterPro	IPR015878. Ado_hCys_hydrolase_NAD-bd. IPR016040. NAD(P)-bd_dom. IPR000043. S-Ado-L-homoCys_hydrolase. IPR020082. S-Ado-L-homoCys_hydrolase_CS. [Graphical view]
PANTHER	PTHR23420. Ad_hcy_hydrolase. 1 hit.
Pfam	PF05221. AdoHcyase. 1 hit. PF00670. AdoHcyase_NAD. 1 hit. [Graphical view]
PIRSF	PIRSF001109. Ad_hcy_hydrolase. 1 hit.
TIGRFAMs	TIGR00936. ahcY. 1 hit.
PROSITE	PS00738. ADOHCYASE_1. 1 hit. PS00739. ADOHCYASE_2. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

SAHH_MESCR

Accession

Primary (citable) accession number: P93253

Entry history

Integrated into UniProtKB/Swiss-Prot:	December 15, 1998
Last sequence update:	May 1, 1997
Last modified:	November 24, 2009
This is version 52 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

PPAP (Plant Proteome Annotation Project)