Reviewed, UniProtKB/Swiss-Prot O93477 (SAHHB_XENLA)

Names and origin

Protein names

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

Gene names

Name:	ahcy-B
Synonyms:	ahcy2, sahh

Organism

Xenopus laevis (African clawed frog)

Taxonomic identifier

8355 [NCBI]

Taxonomic lineage

Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Amphibia › Batrachia › Anura › Mesobatrachia › Pipoidea › Pipidae › Xenopodinae › Xenopus › Xenopus

Protein attributes

Sequence length	433 AA.
Sequence status	Complete.
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 By similarity.
Pathway	Amino-acid biosynthesis; L-homocysteine biosynthesis; L-homocysteine from S-adenosyl-L-homocysteine: step 1/1.
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 – 433	433	Adenosylhomocysteinase B		PRO_0000116907
Regions
	Region	184 – 351	168	NAD binding By similarity
Sites
	Binding site	57	1	Substrate By similarity
	Binding site	132	1	Substrate By similarity
	Binding site	157	1	Substrate By similarity
	Binding site	187	1	Substrate By similarity
	Binding site	191	1	Substrate By similarity

Sequences

	Sequence		Length	Mass (Da)
	O93477-1 [UniParc]. Last modified November 1, 1998. Version 1. Checksum: 3CB91D67C555B47C	FASTA	433	47,745
	10 20 30 40 50 60 MSDKLSYKVA DISLADWGRK AIEIAENEMP GLMKMREMYS ESKPLKGARI AGCLHMTLQT 70 80 90 100 110 120 AVLIETLTAI GAEVQWSSCN IFSTQDHAAA AIAKTGVPVY AWKGETDEEY IWCIEQTIYF 130 140 150 160 170 180 KDGKPLNMIL DDGGDLTNLV HTKYPQLLKG IKGISEETTT GVHNLYKMKS SGTLQVPAIN 190 200 210 220 230 240 VNDSVTKSKF DNLYGCRESL IDGIKRATDV MIAGKVAVVA GYGDVGKGCA QALRAFGARV 250 260 270 280 290 300 LITEIDPINA LQAAMEGYEV TTMDEASKEG NIFVTTTGCA DIVEGRHFEN MKDDSIVCNI 310 320 330 340 350 360 GHFDVELDVK WLNDNAAKKI NIKPQVDRYL LKNGRHIILL AEGRLVNLGC AMGHPSFVMS 370 380 390 400 410 420 NSFTNQVMAQ IELWTNTDKY PVGVYFLPKK LDEAVAAAHL DKLGVKLTKL TDKQAKYLGL 430 DKEGPFKPDH YRY

References

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	"S-adenosylhomocysteine hydrolase." Radomski N., Plessmann U., Mohl C., Weber K., Dreyer C. Submitted (JUL-1998) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [MRNA]. Tissue: Ovary.
[2]	NIH - Xenopus Gene Collection (XGC) project Submitted (JUN-2004) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]. Tissue: Kidney.

Cross-references

Sequence databases
EMBL GenBank DDBJ	AJ007835 mRNA. Translation: CAA07706.1. BC074224 mRNA. Translation: AAH74224.1.
RefSeq	NP_001089040.1.
UniGene	Xl.1111
3D structure databases
SMR	O93477. Positions 3-433.
ModBase	Search...
Proteomic databases
PRIDE	O93477.
Genome annotation databases
GeneID	503682.
KEGG	xla:503682.
Organism-specific databases
CTD	503682.
Xenbase	XB-FEAT-950016. ahcy.
Phylogenomic databases
HOVERGEN	O93477.
Enzyme and pathway databases
BRENDA	3.3.1.1. 648.
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

SAHHB_XENLA

Accession

Primary (citable) accession number: O93477
Secondary accession number(s): Q6DKD5

Entry history

Integrated into UniProtKB/Swiss-Prot:	December 15, 1998
Last sequence update:	November 1, 1998
Last modified:	February 9, 2010
This is version 63 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

Xenopus annotation project