Detailed entry information

Protein Information (annotations from UniProt)

Database IDHIV0007048
UniProt IDO75533
Primary gene name(s)SF3B1
Synonym gene name(s)SAP155
Protein nameSplicing factor 3B subunit 1
Protein functionSubunit of the splicing factor SF3B required for 'A' complex assembly formed by the stable binding of U2 snRNP to the branchpoint sequence, BPS in pre-mRNA. Sequence independent binding of SF3A/SF3B complex upstream of the branch site is essential, it may anchor U2 snRNP to the pre-mRNA. May also be involved in the assembly of the 'E' complex. Belongs also to the minor U12-dependent spliceosome, which is involved in the splicing of rare class of nuclear pre-mRNA intron.
Subcellular locationNucleus speckle. Note=During mitosis, transiently dispersed from the nuclear speckles to the cytoplasm.
ECO codeClick here for more information.
Amino acid sequence
FASTA format: O75533
Gene Ontology
(Biological Process)
Complete annatation
mRNA splicing, via spliceosome [GO:0000398];
positive regulation of gene expression, epigenetic [GO:0045815];
RNA splicing, via transesterification reactions [GO:0000375];
spliceosomal complex assembly [GO:0000245]
Gene Ontology
(Molecular Function)
Complete annatation
mRNA binding [GO:0003729];
poly(A RNA binding [GO:0044822]
Gene Ontology
(Cellular Component)
Complete annatation
catalytic step 2 spliceosome [GO:0071013];
nuclear speck [GO:0016607];
nucleoplasm [GO:0005654];
nucleus [GO:0005634];
spliceosomal complex [GO:0005681];
U11/U12 snRNP [GO:0034693];
U12-type spliceosomal complex [GO:0005689];
U2 snRNP [GO:0005686];
U2-type prespliceosome [GO:0071004]
Protein-protein interaction117017
Phylogenetic treeO75533
HIV replication factor status Zhou et al., Cell. Host. Microbe., 2008
Brass et al., Science, 2008
Smith et al., J. Immunol, 2010
gene status
Lu et al., J. Virol., 2011
      Folds changes 8h: unknown; Folds changes 16h: unknown; Tested: unknown;
Schoggins JW and Rice CM, Curr. Opin. Virol., 2011
      Targeted viruses: unknown
      Viral life cycle: unknown
      Mechanism related to antiviral activity: unknown
Anti-viral restriction factor Liu et al., Retrovirology, 2011
      unknown (Triplicates)

Gene Expression Profile       top

            Up-regulated;            Down-regulated

For brief introduction to each study, please go to the help page.

Gene expression during HIV latency

(1). Mohammadi et al., PLoS Pathog., 2014

Differentially expressed transcripts (Pairwise) during latency and subsequent viral reactivation using several agents - Primary CD4+ T-cell based model

DMSO: Dimethyl suloxyde (negative control) - 0.0033% final
SAHA: Vorinostat (Histone deacetylase inhibitor) - 0.5 μM
CD3: TCR Stimulation by IL-2+ antiCD3/anti-CD28 antibodies
IL7: Interleukin-7 based stimulation
DISU: Disulfiram (alcohol dehydrogenase inhibitor) - 0.5 μM
AZA: 5-azacytidine (AZA; DNA methylation inhibitor) - 1 μM
Experimental Condition Log2 Fold Change P value Adjusted P value
AZA vs. CD3-0.3852301350664880.2394875841776560.3506466746382
AZA vs. DISU-0.0894414640803930.7229065282176460.974208899704183
AZA vs. IL7-0.1032459690785490.5896888657688770.999311006273513
AZA vs. SAHA-0.01000285052348690.9671838904822660.991228805411965
DISU vs. CD30.2825785392333830.4360786344073740.567606366898951
DISU vs. IL7-0.02254517891143910.9285284564328160.986716937877111
DISU vs. SAHA0.08018976889968720.7826950710119220.940637642254177
DMSO vs. AZA0.08285976627416790.618905762283821
DMSO vs. CD30.4546059644134630.1552600991971850.243721308159382
DMSO vs. DISU0.1699264785756750.4851620858730980.902975501310064
DMSO vs. IL7-0.1786333234026990.3184061092344310.798162795924126
DMSO vs. SAHA-0.09971537007522180.6713251164599030.89718372174933
HIV vs. Mock in Activation0.03258650687542910.9582903065911660.999983755607037
HIV vs. Mock in Latency0.05354800232032040.7444214416023370.999834320637052
IL7 vs. CD30.2904910893103860.3653886391504130.502876457077627
SAHA vs. CD30.3497539022253970.3219960730809770.436924259078906
SAHA vs. IL70.08868014296346560.7148845868911930.869256292877135
(2). Iglesias-Ussel et al., J. Virol., 2013

Up and Downregulated transcripts during Latency (Latently infected CD4+ T cells vs Uninfected)- Primary CD4+Tcell based model
Log2 Fold Change P Value
unknown unknown

Gene expression during HIV infection and replication

(1). Imbeault et al., PloS Pathog., 2012

Transcriptomic profiling of HIV-1 infected CD4+ T cells - Primary CD4+ T cells
Experiment type Log2 Fold Change P Value Adjusted P Value
Infected vs. Mock unknown unknown unknown
Infected vs. Bystander unknown unknown unknown
(2). Lefebvre et al., J. Virol., 2011

Transcriptome analysis of T-cell line (Sup T1)
Log2 Fold Change unknown
(3). Li et al., J. Immunol., 2013

Lymphatic tissue
Acute Fold Change Acute P Value Asymt Fold Change Asypt P Value AIDS Fold Change AIDS P Value
unknown unknown unknown unknown unknown unknown
(4). Chang et al., MBio., 2011

Transcriptome analysis of T-cell line (Sup T1)

Derived from Sherrill-Mix et al., BMC Retrovirol., 2015 cross validation
Up-regulated (True) unknown
(5). Sherrill-Mix et al., BMC Retrovirol., 2015

Deep RNA-seq analysis of primary human T cell infected with low passage HIV isolate HIV89.6 - Primary CD4+ T cell based
Test Status Log2 Fold Change P Value
OK 0.13065 0.39358
(6). Rotger et al., PLoS Pathog., 2010

Genome-wide mRNA expression of CD4+ T cells from HIV-infected patient
(Genes differentially expressed (at adjusted p<0.01) according to the empirical Bayes approach)
Log2 Fold Change P Value
unknown unknown

Proteomic/Transcriptomics studies indicating differentially expressed genes mediated by HIV

(1). Greenwood et al., Elife, 2016

Activated (CD3/CD28) Primary human CD4+ T cells infected with pNL4-3-dE-EGFP. The table shows the complete (unfiltered) TMT (tandem mass tag)-based proteomic time course dataset
6 h 24 h 48 h 72 h RTi
1.018 0.966 0.872 0.717 0.914
(2). Navare et al., Virology, 2012

SUP-T1 cell line
FC-4hpi P-value FC-8hpi P-value FC-20hpi P-value Category
unknown unknown unknown unknown unknown unknown unknown
(3). Hyrcza et al., J. Virolo., 2007

Primary human CD4+ and CD8+ T Cells
Affymetrix Prob ID Fold Change In CD8? Category
unknown unknown unknown unknown

Protein Overview       top

Drug-protein Interaction       (annotations from DrugBank)      top

not found

Protein Secondary Structure       (annotations from PDB)      top

PDB Accession Method Resolution Chain Structure Preview
2F9D X-ray 2.5Å P/Q=373-415.
2F9J X-ray 3.0Å P/Q=380-415.
2FHO NMR - A=379-424.
2PEH X-ray 2.1Å C/D=333-342.
3LQV X-ray 2.3Å P/Q=377-415.
4OZ1 X-ray 1.7Å C=333-342.

HIV-1 Interaction       (annotations from NCBI HIV-1 Interaction Database)      top

HIV Partner Interaction Type PubMed
Envelope surface glycoprotein gp120 complexes with 23125841
Gag-Pol complexes with 23125841
Pr55(Gag) complexes with 23125841
HIV-1 virus replication enhanced by expression of human gene 18854154
Nef complexes with 23125841

Metabolic/Signalling Pathway       (annotations from KEGG database)      top

Pathway Accession Number Description
hsa03040 Spliceosome - Homo sapiens (human)