Reviewed, UniProtKB/Swiss-Prot P40312 (CYB5_YEAST)

Names and origin

Protein names

Recommended name:
    Cytochrome b5

Gene names

Name:	CYB5
Ordered Locus Names:	YNL111C
ORF Names:	N1949

Organism

Saccharomyces cerevisiae (Baker's yeast) [Complete proteome]

Taxonomic identifier

4932 [NCBI]

Taxonomic lineage

Eukaryota › Fungi › Dikarya › Ascomycota › Saccharomycotina › Saccharomycetes › Saccharomycetales › Saccharomycetaceae › Saccharomyces

Protein attributes

Sequence length	120 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Evidence at protein level.

General annotation (Comments)

Function	Membrane bound hemoprotein which function as an electron carrier for several membrane bound oxygenases. It plays a role in fatty-acid desaturation and is also involved in several steps of the sterol biosynthesis pathway, particularly in the 4-demethylation of the 4,4'-dimethyl zymosterol.
Subcellular location	Endoplasmic reticulum membrane; Single-pass membrane protein; Cytoplasmic side By similarity. Microsome membrane; Single-pass membrane protein; Cytoplasmic side By similarity.
Miscellaneous	Present with 5390 molecules/cell in log phase SD medium. Ref.5
Sequence similarities	Belongs to the cytochrome b5 family. Contains 1 cytochrome b5 heme-binding domain.

Ontologies

Keywords
Biological process	Electron transport Transport
Cellular component	Endoplasmic reticulum Membrane Microsome
Domain	Transmembrane
Ligand	Heme Iron Metal-binding
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW sterol biosynthetic process Inferred from direct assay. Source: SGD transport Inferred from electronic annotation. Source: UniProtKB-KW
Cellular component	endoplasmic reticulum membrane Inferred from direct assay. Source: SGD integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW microsome Inferred from direct assay. Source: SGD
Molecular function	electron carrier activity Inferred from direct assay. Source: SGD heme 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 – 120	120	Cytochrome b5		PRO_0000166035
Regions
	Transmembrane	98 – 118	21	Potential
	Domain	2 – 78	77	Cytochrome b5 heme-binding
Sites
	Metal binding	37	1	Iron (heme axial ligand) By similarity
	Metal binding	61	1	Iron (heme axial ligand) By similarity
Experimental info
	Sequence conflict	17	1	E → Q in AAA67468. Ref.1

Sequences

	Sequence		Length	Mass (Da)
	P40312-1 [UniParc]. Last modified October 1, 1996. Version 2. Checksum: 598EF2A6730CAD19	FASTA	120	13,297
	10 20 30 40 50 60 MPKVYSYQEV AEHNGPENFW IIIDDKVYDV SQFKDEHPGG DEIIMDLGGQ DATESFVDIG 70 80 90 100 110 120 HSDEALRLLK GLYIGDVDKT SERVSVEKVS TSENQSKGSG TLVVILAILM LGVAYYLLNE

References

	« Hide 'large scale' referencesShow 'large scale' references »
[1]	"Cloning and characterization of a yeast cytochrome b5-encoding gene which suppresses ketoconazole hypersensitivity in a NADPH-P-450 reductase-deficient strain." Truan G., Epinat J.-C., Rougeulle C., Cullin C., Pompon D. Gene 142:123-127(1994) [PubMed: 8181746] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: ATCC 28383 / FL100 / VTT C-80102.
[2]	"The DNA sequence of cosmid 14-13b from chromosome XIV of Saccharomyces cerevisiae reveals an unusually high number of overlapping open reading frames." de Antoni A., D'Angelo M., Dal Pero F., Sartorello F., Pandolfo D., Pallavicini A., Lanfranchi G., Valle G. Yeast 13:261-266(1997) [PubMed: 9090055] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
[3]	"The nucleotide sequence of Saccharomyces cerevisiae chromosome XIV and its evolutionary implications." Philippsen P., Kleine K., Poehlmann R., Duesterhoeft A., Hamberg K., Hegemann J.H., Obermaier B., Urrestarazu L.A., Aert R., Albermann K., Altmann R., Andre B., Baladron V., Ballesta J.P.G., Becam A.-M., Beinhauer J.D., Boskovic J., Buitrago M.J. , Bussereau F., Coster F., Crouzet M., D'Angelo M., Dal Pero F., De Antoni A., del Rey F., Doignon F., Domdey H., Dubois E., Fiedler T.A., Fleig U., Floeth M., Fritz C., Gaillardin C., Garcia-Cantalejo J.M., Glansdorff N., Goffeau A., Gueldener U., Herbert C.J., Heumann K., Heuss-Neitzel D., Hilbert H., Hinni K., Iraqui Houssaini I., Jacquet M., Jimenez A., Jonniaux J.-L., Karpfinger-Hartl L., Lanfranchi G., Lepingle A., Levesque H., Lyck R., Maftahi M., Mallet L., Maurer C.T.C., Messenguy F., Mewes H.-W., Moestl D., Nasr F., Nicaud J.-M., Niedenthal R.K., Pandolfo D., Pierard A., Piravandi E., Planta R.J., Pohl T.M., Purnelle B., Rebischung C., Remacha M.A., Revuelta J.L., Rinke M., Saiz J.E., Sartorello F., Scherens B., Sen-Gupta M., Soler-Mira A., Urbanus J.H.M., Valle G., Van Dyck L., Verhasselt P., Vierendeels F., Vissers S., Voet M., Volckaert G., Wach A., Wambutt R., Wedler H., Zollner A., Hani J. Nature 387:93-98(1997) [PubMed: 9169873] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. Strain: ATCC 96604 / S288c / FY1679.
[4]	"Approaching a complete repository of sequence-verified protein-encoding clones for Saccharomyces cerevisiae." Hu Y., Rolfs A., Bhullar B., Murthy T.V.S., Zhu C., Berger M.F., Camargo A.A., Kelley F., McCarron S., Jepson D., Richardson A., Raphael J., Moreira D., Taycher E., Zuo D., Mohr S., Kane M.F., Williamson J. , Simpson A.J.G., Bulyk M.L., Harlow E., Marsischky G., Kolodner R.D., LaBaer J. Genome Res. 17:536-543(2007) [PubMed: 17322287] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: ATCC 204508 / S288c.
[5]	"Global analysis of protein expression in yeast." Ghaemmaghami S., Huh W.-K., Bower K., Howson R.W., Belle A., Dephoure N., O'Shea E.K., Weissman J.S. Nature 425:737-741(2003) [PubMed: 14562106] [Abstract] Cited for: LEVEL OF PROTEIN EXPRESSION [LARGE SCALE ANALYSIS].
+	Additional computationally mapped references.

Cross-references

Sequence databases
EMBLGenBankDDBJ	L22494 Genomic DNA. Translation: AAA67468.1. Z69382 Genomic DNA. Translation: CAA93396.1. Z71387 Genomic DNA. Translation: CAA95990.1. AY693106 Genomic DNA. Translation: AAT93125.1.
PIR	S63052.
RefSeq	NP_014288.1.
3D structure databases
HSSP	HSSP built from PDB template 1EUE based on UniProtKB P04166.
ModBase	Search...
Protein-protein interaction databases
IntAct	P40312. 1 interaction.
Proteomic databases
PeptideAtlas	P40312.
Genome annotation databases
Ensembl	YNL111C. Saccharomyces cerevisiae. [Contig view]
GeneID	855612.
GenomeReviews	Gene locus YNL111C in contig Y13139_GR.
KEGG	sce:YNL111C.
NMPDR	fig|4932.3.peg.5358.
Organism-specific databases
CYGD	YNL111c.
SGD	S000005055. CYB5.
Yeast-GFP	Search...
Phylogenomic databases
HOGENOM	P40312.
Gene expression databases
GermOnline	YNL111C. Saccharomyces cerevisiae.
Family and domain databases
InterPro	IPR001199. Cyt_B5. IPR018506. Cyt_B5_heme-BS. [Graphical view]
Gene3D	G3DSA:3.10.120.10. Cyt_B5. 1 hit.
Pfam	PF00173. Cyt-b5. 1 hit. [Graphical view]
PRINTS	PR00363. CYTOCHROMEB5.
ProDom	PD000612. Cyt_B5. 1 hit. [Graphical view] [Entries sharing at least one domain]
PROSITE	PS00191. CYTOCHROME_B5_1. 1 hit. PS50255. CYTOCHROME_B5_2. 1 hit. [Graphical view]
ProtoNet	Search...
Other Resources
NextBio	979792.

Entry information

Entry name

CYB5_YEAST

Accession

Primary (citable) accession number: P40312

Entry history

Integrated into UniProtKB/Swiss-Prot:	February 1, 1995
Last sequence update:	October 1, 1996
Last modified:	June 16, 2009
This is version 76 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

FPAP (Fungal Proteome Annotation Project)