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MPact protein interaction

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About CYGD

MIPS Fungal Genomes

mips home MIPS-FUNGI-ADM      FTP
SUA7 TFIIB subunit (transcription initiation factor), factor E 
Alias:P9513.4; SOH4; TFIIB
Classification:known protein | 5422 Entries | Evi | PUBMED
Feature Type:CDS
   Blast-Simap    DNA VIEW    PROTEIN VIEW

Paralogs (11.6 %) ;  |  Homologs in   Hemiascomycota (99.7 %);  Basidiomycota (37.2 %);  Fungi (99.7 %);  Eukaryota (99.7 %);  Plants (30.8 %);  Mammalia (33.6 %);  Human (32.5 %);  Bacteria (18.8 %);  All except yeast (99.7 %)

  • strong similarity to K.lactis transcription initiation factor IIB
  • 35% identity overall to human TFIIB
Functional Classification:
    ..RNA synthesis
    ....mRNA synthesis
    ......general transcription activities
    ........transcription initiation | 46 Entries | Evi | PUBMED
Localization:  SUA7 localization details
  • cytoplasm
  • nucleus
  • human TFIIB cannot functionally replace yeast Sua7p
  • replacement of Sua7p and Rpo21p with S. pombe counterparts switches to transcription start-site selection pattern characteristic of S. pombe
  • the TBP-TFIIB interaction is not generally limiting for transcriptional activation
  • has a zinc-finger motif in the N-terminal region
  • amino terminus is involved in direct interaction between TFIIB and RNA polymerase II | PUBMED
  • C-terminal region is compact and protease-resistant
  • C-terminal region interacts with TBP-promoter complex
  • N-terminal region is essential for basal transcription and interacts with polII-TFIIF
  • amino acids 144-157 are important for the species-specific function
  • human/yeast hybrid proteins are only functional if they containe the region 144-157 of the yeast protein
  • region 144 to 157 correspondes to a amhipathic helix
  • has two imperfect repeats in the C-terminal region and a putative helix region between the two repeats
  • mutations in the species-specific region(residues 144-157) differentially affect gene expression
Phenotypes:  Disruption: SUA7 details
  • lethal
  • glu52lys mutant has cold-sensitive phenotype
  • sua7 tfg1 double mutant has heat sensitivity which is a synthetic phenotype since neither single mutant is heat sensitive
  • soh1 soh4 grows poorly or not at all at 37 deg
  • acidic substitutions of residues K190 and K201 results in growth defects, reduced basal in vitro transcriptional activity and inability to form stable TFIIB-TATA-binding protein-DNA comolexes | PUBMED
  • Conditional phenotypes
    ..Cold-sensitivity (cs) | 105 Entries
  • Nucleic acid metabolism defects
    ..Transcriptional mutants
    ....other transcriptional mutants | 51 Entries
  • SSU73-1(truncated form of Rpb9p)
  • suppresses growth defect of hpr1 null mutant at 37 deg
  • sua7 partially suppresses hyperrecombination phenotype of hpr1
  • stb genes (suppressor of TFIIB) are suppressors of sua7-3 mutant phenotype
Click for larger Map
Physical Features
Coordinates:710099 - 711136 (W)
Length:1038 nt
Exon Coordinates:710099 - 711136
GC Content:40.2 %
Protein Length:345 aa
Isoelectric Point:8.85
Molecular Weight:38200.6 Da
Retrieve Sequence: DNA /Protein
Literature | References
CYGD curated Lit.:PubMed
PubMed:Search abstracts
PubMed Central:Search full-text articles
Sequence References:
EMBL: M81380
EMBL: U51033
PIR: S26707
UniProtKB: P29055
NCBI: NP_015411
Additional Links:
CYGD Pathways:
  • RNA Polymerase II Transcription Initiation Machinery
  • LinkOut:
  • SGD - Saccharomyces Genome Database
  • YGOB - Yeast Gene Order Browser
  • yMGV - yeast Microarray Global Viewer

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