Reviewed, UniProtKB/Swiss-Prot Q0H8X2 (BI1_USTMA)

Names and origin

Protein names

Recommended name:
    Probable intron-encoded endonuclease bI1
Cleaved into the following 2 chains:
    1- Recommended name:
            Truncated non-functional cytochrome b
    2- Recommended name:
            Intron-encoded endonuclease bI1
              EC=3.1.-.-

Gene names

Name:

bI1

Encoded on

Mitochondrion

Organism

Ustilago maydis (Smut fungus) [Complete proteome]

Taxonomic identifier

5270 [NCBI]

Taxonomic lineage

Eukaryota › Fungi › Dikarya › Basidiomycota › Ustilaginomycotina › Ustilaginomycetes › Ustilaginales › Ustilaginaceae › Ustilago

Protein attributes

Sequence length	410 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Inferred from homology.

General annotation (Comments)

Function	Mitochondrial DNA endonuclease involved in intron homing By similarity.
Subcellular location	Mitochondrion. Membrane; Multi-pass membrane protein Potential.
Post-translational modification	The mature protein may arise from proteolytic cleavage of an in-frame translation of COB exon 1 plus intron 1, containing the bI1 open reading frame.
Sequence similarities	To endonucleases of group I introns of fungi and phage.

Ontologies

Keywords
Biological process	Intron homing
Cellular component	Membrane Mitochondrion
Domain	Transmembrane
Molecular function	Endonuclease Hydrolase Nuclease
Technical term	Complete proteome
Gene Ontology (GO)
Biological process	DNA repair Inferred from electronic annotation. Source: InterPro intron homing Inferred from electronic annotation. Source: UniProtKB-KW respiratory electron transport chain Inferred from electronic annotation. Source: InterPro
Cellular component	integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW mitochondrion Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular function	electron carrier activity Inferred from electronic annotation. Source: InterPro endonuclease activity Inferred from electronic annotation. Source: UniProtKB-KW oxidoreductase activity 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 – ?		Truncated non-functional cytochrome b		PRO_0000271164
	Chain	? – 410		Intron-encoded endonuclease bI1		PRO_0000271165
Regions
	Transmembrane	32 – 52	21	Potential
	Transmembrane	75 – 95	21	Potential
	Transmembrane	112 – 132	21	Potential
	Region	1 – 131	131	COB exon 1 encoded
	Region	132 – 410	279	COB intron 1 encoded

Sequences

	Sequence		Length	Mass (Da)
	Q0H8X2-1 [UniParc]. Last modified January 9, 2007. Version 2. Checksum: 57A0A58B7BC913E5	FASTA	410	46,822
	10 20 30 40 50 60 MRLLKTHPIL GLANSYLIDS PQPSNISYMW NFGSLLGVCL IIQILTGVFL AMHYTPSVDL 70 80 90 100 110 120 AFISVEHIMR DVNYGWLIRY LHANTASFFF IFVYLHIGRG LYYGSYKSPR TLLWSIGVII 130 140 150 160 170 180 LVLMMAIAFL GFNGQKYMCF YNIDITIIQY LSIPTLITPS TRLKPILDKH NIKPVLLFEN 190 200 210 220 230 240 LTNSETKKIA YQALKPFSGI YMIVNLITEK YYVGSAVTGN LYMRFHKHLF SFTGNKRVAN 250 260 270 280 290 300 AVNKYGLSEF AFLVLEIVPQ KDKIDSTLLL NREDYYLETL KPEYNIAPLA SNSLGWKHSE 310 320 330 340 350 360 ESLAKMRENY SEERRQQVAN INKGKTLSEE TRELIRKSAL LRKSMSSETR MKCAVNVQPV 370 380 390 400 410 TIINLDGTNI MNFVSIKEAS IAISCNEKTI RRALNGNGIV KKNYIVKVIK

References

[1]	"Annotation of mitochondrial genome of Ustilago maydis and comparative analysis of basidiomycete mtDNAs." Kennell J.C., Boehmer C. Submitted (AUG-2005) to the EMBL/GenBank/DDBJ databases Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases
EMBLGenBankDDBJ	DQ157700 Genomic DNA. Translation: AAZ67030.1. Different initiation.
RefSeq	YP_762700.1.
3D structure databases
ModBase	Search...
Genome annotation databases
GeneID	4308280.
GenomeReviews	Gene locus bI1 in contig DQ157700_GR.
Family and domain databases
InterPro	IPR016175. Cyt_b/b6. IPR005797. Cyt_b/b6_N. IPR006350. Intron_endoG1. IPR003647. Intron_nuc_1. IPR003611. Intron_nuc_2. IPR010896. NUMOD1. IPR000305. UvrC_N. [Graphical view]
Gene3D	G3DSA:1.20.810.10. Cytochrome_b/b6. 1 hit.
PANTHER	PTHR19271. Cytochrome_b/b6. 1 hit.
Pfam	PF00033. Cytochrom_B_N. 1 hit. PF01541. GIY-YIG. 1 hit. PF07453. NUMOD1. 1 hit. PF07460. NUMOD3. 3 hits. [Graphical view]
SMART	SM00465. GIYc. 1 hit. SM00497. IENR1. 1 hit. SM00496. IENR2. 2 hits. [Graphical view]
TIGRFAMs	TIGR01453. grpIintron_endo. 1 hit.
PROSITE	PS51002. CYTB_NTER. 1 hit. PS50164. UVRC_1. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

BI1_USTMA

Accession

Primary (citable) accession number: Q0H8X2

Entry history

Integrated into UniProtKB/Swiss-Prot:	January 9, 2007
Last sequence update:	January 9, 2007
Last modified:	June 16, 2009
This is version 18 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

FPAP (Fungal Proteome Annotation Project)