'''Podjedinica IIIB [[Transkripcijski faktor|transkripcijskog faktora]]''', od 50 kDa (TFIIIB50), znana i kao  '''b-srodni faktor 2''' (BRF-2) je [[protein]] koji je kod [[ljudi]] [[kodon|kodiran]] [[gen]]om '''BRF2'''.<ref name="pmid11483580">{{cite journal | vauthors = Yu Y, Zhang C, Zhou G, Wu S, Qu X, Wei H, Xing G, Dong C, Zhai Y, Wan J, Ouyang S, Li L, Zhang S, Zhou K, Zhang Y, Wu C, He F | title = Gene expression profiling in human fetal liver and identification of tissue- and developmental-stage-specific genes through compiled expression profiles and efficient cloning of full-length cDNAs | journal = Genome Res | volume = 11 | issue = 8 | pages = 1392–403 |date=Aug 2001 | pmid = 11483580 | pmc = 311073 | doi = 10.1101/gr.175501 }}</ref><ref name="pmid11564744">{{cite journal | vauthors = Cabart P, Murphy S | title = BRFU, a TFIIB-like factor, is directly recruited to the TATA-box of polymerase III small nuclear RNA gene promoters through its interaction with TATA-binding protein | journal = J Biol Chem | volume = 276 | issue = 46 | pages = 43056–64 |date=Nov 2001 | pmid = 11564744 | doi = 10.1074/jbc.M108515200 | doi-access = free }}</ref><ref name="entrez">{{cite web | title = Entrez Gene: BRF2 BRF2, subunit of RNA polymerase III transcription initiation factor, BRF1-like| url = https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=55290}}</ref>
==Aminokiselinska sekvenca==
Dužina [[polipeptid]]nog lanca je  419 [[aminokiselina]], а [[molekularna masa|molekulska težina]]  46.533 [[dalton (jedinica)|Da]].<ref name="UniProt">{{cite web|url=http://www.uniprot.org/uniprot/Q9HAW0#sequences |title=UniProt, Q9HAW0 |access-date=14. 9. 2021}}</ref>
{{legenda aminokiselina}}
<table  style="font-family:monospace;">
<tr style="text-align:right;"><th>10</th><th></th><th>20</th><th></th><th>30</th><th></th><th>40</th><th></th><th>50</th></tr>
<tr style="background-color: #eee;"><td>MPGRGRCPDC</td><td style="background-color: #f9f9f9;"></td><td>GSTELVEDSH</td><td style="background-color: #f9f9f9;"></td><td>YSQSQLVCSD</td><td style="background-color: #f9f9f9;"></td><td>CGCVVTEGVL</td><td style="background-color: #f9f9f9;"></td><td>TTTFSDEGNL</td></tr>
<tr style="background-color: #eee;"><td>REVTYSRSTG</td><td style="background-color: #f9f9f9;"></td><td>ENEQVSRSQQ</td><td style="background-color: #f9f9f9;"></td><td>RGLRRVRDLC</td><td style="background-color: #f9f9f9;"></td><td>RVLQLPPTFE</td><td style="background-color: #f9f9f9;"></td><td>DTAVAYYQQA</td></tr>
<tr style="background-color: #eee;"><td>YRHSGIRAAR</td><td style="background-color: #f9f9f9;"></td><td>LQKKEVLVGC</td><td style="background-color: #f9f9f9;"></td><td>CVLITCRQHN</td><td style="background-color: #f9f9f9;"></td><td>WPLTMGAICT</td><td style="background-color: #f9f9f9;"></td><td>LLYADLDVFS</td></tr>
<tr style="background-color: #eee;"><td>STYMQIVKLL</td><td style="background-color: #f9f9f9;"></td><td>GLDVPSLCLA</td><td style="background-color: #f9f9f9;"></td><td>ELVKTYCSSF</td><td style="background-color: #f9f9f9;"></td><td>KLFQASPSVP</td><td style="background-color: #f9f9f9;"></td><td>AKYVEDKEKM</td></tr>
<tr style="background-color: #eee;"><td>LSRTMQLVEL</td><td style="background-color: #f9f9f9;"></td><td>ANETWLVTGR</td><td style="background-color: #f9f9f9;"></td><td>HPLPVITAAT</td><td style="background-color: #f9f9f9;"></td><td>FLAWQSLQPA</td><td style="background-color: #f9f9f9;"></td><td>DRLSCSLARF</td></tr>
<tr style="background-color: #eee;"><td>CKLANVDLPY</td><td style="background-color: #f9f9f9;"></td><td>PASSRLQELL</td><td style="background-color: #f9f9f9;"></td><td>AVLLRMAEQL</td><td style="background-color: #f9f9f9;"></td><td>AWLRVLRLDK</td><td style="background-color: #f9f9f9;"></td><td>RSVVKHIGDL</td></tr>
<tr style="background-color: #eee;"><td>LQHRQSLVRS</td><td style="background-color: #f9f9f9;"></td><td>AFRDGTAEVE</td><td style="background-color: #f9f9f9;"></td><td>TREKEPPGWG</td><td style="background-color: #f9f9f9;"></td><td>QGQGEGEVGN</td><td style="background-color: #f9f9f9;"></td><td>NSLGLPQGKR</td></tr>
<tr style="background-color: #eee;"><td>PASPALLLPP</td><td style="background-color: #f9f9f9;"></td><td>CMLKSPKRIC</td><td style="background-color: #f9f9f9;"></td><td>PVPPVSTVTG</td><td style="background-color: #f9f9f9;"></td><td>DENISDSEIE</td><td style="background-color: #f9f9f9;"></td><td>QYLRTPQEVR</td></tr>
<tr style="background-color: #eee;"><td>DFQRAQAARQ</td><td style="background-color: #f9f9f9;"></td><td>AATSVPNPP</td></tr>
</table>