3k7a

Crystal Structure of an RNA polymerase II-TFIIB complex

Method: X-RAY DIFFRACTION

▼

1. Protein Identity and Related Structures Protein Identity & Related Structures

DNA-directed RNA polymerase II subunit RPB1

Saccharomyces cerevisiae

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPB1_YEAST
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–1733； UniProt 1–1733

DNA-directed RNA polymerase II subunit RPB2

Saccharomyces cerevisiae

UniProt P08518

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPB2_YEAST
Isoform	—
PDB entities	2
Chains and sequence ranges	Author chain B； PDBConstruct 1–1224； UniProt 1–1224

DNA-directed RNA polymerase II subunit RPB3

Saccharomyces cerevisiae

UniProt P16370

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPB3_YEAST
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain C； PDBConstruct 1–318； UniProt 1–318

DNA-directed RNA polymerases I, II, and III subunit RPABC1

Saccharomyces cerevisiae

UniProt P20434

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPAB1_YEAST
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain E； PDBConstruct 1–215； UniProt 1–215

DNA-directed RNA polymerases I, II, and III subunit RPABC2

Saccharomyces cerevisiae

UniProt P20435

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPAB2_YEAST
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain F； PDBConstruct 1–155； UniProt 1–155

DNA-directed RNA polymerases I, II, and III subunit RPABC3

Saccharomyces cerevisiae

UniProt P20436

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPAB3_YEAST
Isoform	—
PDB entities	6
Chains and sequence ranges	Author chain H； PDBConstruct 1–146； UniProt 1–146

DNA-directed RNA polymerase II subunit RPB9

Saccharomyces cerevisiae

UniProt P27999

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPB9_YEAST
Isoform	—
PDB entities	7
Chains and sequence ranges	Author chain I； PDBConstruct 1–122； UniProt 1–122

DNA-directed RNA polymerases I, II, and III subunit RPABC5

Saccharomyces cerevisiae

UniProt P22139

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPAB5_YEAST
Isoform	—
PDB entities	8
Chains and sequence ranges	Author chain J； PDBConstruct 1–70； UniProt 1–70

DNA-directed RNA polymerase II subunit RPB11

Saccharomyces cerevisiae

UniProt P38902

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPB11_YEAST
Isoform	—
PDB entities	9
Chains and sequence ranges	Author chain K； PDBConstruct 1–120； UniProt 1–120

DNA-directed RNA polymerases I, II, and III subunit RPABC4

Saccharomyces cerevisiae

UniProt P40422

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） Transcription initiation factor IIB × 1 （P29055） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RPAB4_YEAST
Isoform	—
PDB entities	10
Chains and sequence ranges	Author chain L； PDBConstruct 1–70； UniProt 1–70

Transcription initiation factor IIB

Saccharomyces cerevisiae

UniProt P29055

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein heterocomplex	Heteromer	Protein 11	DNA-directed RNA polymerase II subunit RPB1 × 1 （P04050） DNA-directed RNA polymerase II subunit RPB2 × 1 （P08518） DNA-directed RNA polymerase II subunit RPB3 × 1 （P16370） DNA-directed RNA polymerases I, II, and III subunit RPABC1 × 1 （P20434） DNA-directed RNA polymerases I, II, and III subunit RPABC2 × 1 （P20435） DNA-directed RNA polymerases I, II, and III subunit RPABC3 × 1 （P20436） DNA-directed RNA polymerase II subunit RPB9 × 1 （P27999） DNA-directed RNA polymerases I, II, and III subunit RPABC5 × 1 （P22139） DNA-directed RNA polymerase II subunit RPB11 × 1 （P38902） DNA-directed RNA polymerases I, II, and III subunit RPABC4 × 1 （P40422） ZINC ION × 9	Consistent with protein count

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	TF2B_YEAST
Isoform	—
PDB entities	11
Chains and sequence ranges	Author chain M； PDBConstruct 1–345； UniProt 1–345

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

▼

2. Structure Basics 2. Structure Basics

Entry ID entry_id	3k7a
Deposition date deposition_date	2009-10-12
Structure title title	Crystal Structure of an RNA polymerase II-TFIIB complex
Keywords keywords	;RNA polymerase II, TFIIB, Transcription, DNA-binding, DNA-directed RNA polymerase, Isopeptide bond, Magnesium, Metal-binding, Nucleotidyltransferase, Nucleus, Phosphoprotein, Transferase, Zinc-finger, DNA damage, DNA repair, Transcription regulation ;; TRANSCRIPTION
Experimental Method method	X-RAY DIFFRACTION

▼

3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

3k7a__assembly_1__model_1

Assembly 1 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

3k7a__assembly_1__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

3k7a__assembly_1__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	48.61 Å
Rg (electron density)	47.65 Å
Total Rg	47.96 Å
Atom count	29029
Residues	3757
Excluded volume	514740 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`3k7a__assembly_1__model_1`	undecameric （11）	Success	4.1.3-1-20251215 (887e7ef)	View Download

▶

4. Crystallography and Experiment 4. Crystallography & Experiment

▶

5. Entities and Polymers Entities & Polymers (12)

Entity 1 Entity 1 polymer

Description description	DNA-directed RNA polymerase II subunit RPB1
Molecular weight formula_weight	191821.6 kDa
EC 编号 ec_number	2.7.7.6
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	29029

MVGQQYSSAPLRTVKEVQFGLFSPEEVRAISVAKIRFPETMDETQTRAKIGGLNDPRLGSIDRNLKCQTCQEGMNECPGHFGHIDLAKPVFHVGFIAKIKKVCECVCMHCGKLLLDEHNELMRQALAIKDSKKRFAAIWTLCKTKMVCETDVPSEDDPTQLVSRGGCGNTQPTIRKDGLKLVGSWKKDRATGDADEPELRVLSTEEILNIFKHISVKDFTSLGFNEVFSRPEWMILTCLPVPPPPVRPSISFNESQRGEDDLTFKLADILKANISLETLEHNGAPHHAIEEAESLLQFHVATYMDNDIAGQPQALQKSGRPVKSIRARLKGKEGRIRGNLMGKRVDFSARTVISGDPNLELDQVGVPKSIAKTLTYPEVVTPYNIDRLTQLVRNGPNEHPGAKYVIRDSGDRIDLRYSKRAGDIQLQYGWKVERHIMDNDPVLFNRQPSLHKMSMMAHRVKVIPYSTFRLNLSVTSPYNADFDGDEMNLHVPQSEETRAELSQLCAVPLQIVSPQSNKPCMGIVQDTLCGIRKLTLRDTFIELDQVLNMLYWVPDWDGVIPTPAIIKPKPLWSGKQILSVAIPNGIHLQRFDEGTTLLSPKDNGMLIIDGQIIFGVVEKKTVGSSNGGLIHVVTREKGPQVCAKLFGNIQKVVNFWLLHNGFSTGIGDTIADGPTMREITETIAEAKKKVLDVTKEAQANLLTAKHGMTLRESFEDNVVRFLNEARDKAGRLAEVNLKDLNNVKQMVMAGSKGSFINIAQMSACVGQQSVEGKRIAFGFVDRTLPHFSKDDYSPESKGFVENSYLRGLTPQEFFFHAMGGREGLIDTAVKTAETGYIQRRLVKALEDIMVHYDNTTRNSLGNVIQFIYGEDGMDAAHIEKQSLDTIGGSDAAFEKRYRVDLLNTDHTLDPSLLESGSEILGDLKLQVLLDEEYKQLVKDRKFLREVFVDGEANWPLPVNIRRIIQNAQQTFHIDHTKPSDLTIKDIVLGVKDLQENLLVLRGKNEIIQNAQRDAVTLFCCLLRSRLATRRVLQEYRLTKQAFDWVLSNIEAQFLRSVVHPGEMVGVLAAQSIGEPATQMTLNTFHFAGVASKKVTSGVPRLKEILNVAKNMKTPSLTVYLEPGHAADQEQAKLIRSAIEHTTLKSVTIASEIYYDPDPRSTVIPEDEEIIQLHFSLLDEEAEQSFDQQSPWLLRLELDRAAMNDKDLTMGQVGERIKQTFKNDLFVIWSEDNDEKLIIRCRVVRPKSLDAETEAEEDHMLKKIENTMLENITLRGVENIERVVMMKYDRKVPSPTGEYVKEPEWVLETDGVNLSEVMTVPGIDPTRIYTNSFIDIMEVLGIEAGRAALYKEVYNVIASDGSYVNYRHMALLVDVMTTQGGLTSVTRHGFNRSNTGALMRCSFEETVEILFEAGASAELDDCRGVSENVILGQMAPIGTGAFDVMIDEESLVKYMPEQKITEIEDGQDGGVTPYSNESGLVNADLDVKDELMFSPLVDSGSNDAMAGGFTAYGGADYGEATSPFGAYGEAPTSPGFGVSSPGFSPTSPTYSPTSPAYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPAYSPTSPSYSPTSPSYSPTSPSYSPTSPSYSPTSPNYSPTSPSYSPTSPGYSPGSPAYSPKQDEQKHNENENSR

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 2 Entity 2 polymer

Description description	DNA-directed RNA polymerase II subunit RPB2
Molecular weight formula_weight	138937.3 kDa
EC 编号 ec_number	2.7.7.6
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B

MSDLANSEKYYDEDPYGFEDESAPITAEDSWAVISAFFREKGLVSQQLDSFNQFVDYTLQDIICEDSTLILEQLAQHTTESDNISRKYEISFGKIYVTKPMVNESDGVTHALYPQEARLRNLTYSSGLFVDVKKRTYEAIDVPGRELKYELIAEESEDDSESGKVFIGRLPIMLRSKNCYLSEATESDLYKLKECPFDMGGYFIINGSEKVLIAQERSAGNIVQVFKKAAPSPISHVAEIRSALEKGSRFISTLQVKLYGREGSSARTIKATLPYIKQDIPIVIIFRALGIIPDGEILEHICYDVNDWQMLEMLKPCVEDGFVIQDRETALDFIGRRGTALGIKKEKRIQYAKDILQKEFLPHITQLEGFESRKAFFLGYMINRLLLCALDRKDQDDRDHFGKKRLDLAGPLLAQLFKTLFKKLTKDIFRYMQRTVEEAHDFNMKLAINAKTITSGLKYALATGNWGEQKKAMSSRAGVSQVLNRYTYSSTLSHLRRTNTPIGRDGKLAKPRQLHNTHWGLVCPAETPEGQACGLVKNLSLMSCISVGTDPMPIITFLSEWGMEPLEDYVPHQSPDATRVFVNGVWHGVHRNPARLMETLRTLRRKGDINPEVSMIRDIREKELKIFTDAGRVYRPLFIVEDDESLGHKELKVRKGHIAKLMATEYQDIEGGFEDVEEYTWSSLLNEGLVEYIDAEEEESILIAMQPEDLEPAEANEENDLDVDPAKRIRVSHHATTFTHCEIHPSMILGVAASIIPFPDHNQSPRNTYQSAMGKQAMGVFLTNYNVRMDTMANILYYPQKPLGTTRAMEYLKFRELPAGQNAIVAIACYSGYNQEDSMIMNQSSIDRGLFRSLFFRSYMDQEKKYGMSITETFEKPQRTNTLRMKHGTYDKLDDDGLIAPGVRVSGEDVIIGKTTPISPDEEELGQRTAYHSKRDASTPLRSTENGIVDQVLVTTNQDGLKFVKVRVRTTKIPQIGDKFASRHGQKGTIGITYRREDMPFTAEGIVPDLIINPHAIPSRMTVAHLIECLLSKVAALSGNEGDASPFTDITVEGISKLLREHGYQSRGFEVMYNGHTGKKLMAQIFFGPTYYQRLRHMVDDKIHARARGPMQVLTRQPVEGRSRDGGLRFGEMERDCMIAHGAASFLKERLMEASDAFRVHICGICGLMTVIAKLNHNQFECKGCDNKIDIYQIHIPYAAKLLFQELMAMNITPRLYTDRSRDF

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 3 Entity 3 polymer

Description description	DNA-directed RNA polymerase II subunit RPB3
Molecular weight formula_weight	35330.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C

MSEEGPQVKIREASKDNVDFILSNVDLAMANSLRRVMIAEIPTLAIDSVEVETNTTVLADEFIAHRLGLIPLQSMDIEQLEYSRDCFCEDHCDKCSVVLTLQAFGESESTTNVYSKDLVIVSNLMGRNIGHPIIQDKEGNGVLICKLRKGQELKLTCVAKKGIAKEHAKWGPAAAIEFEYDPWNKLKHTDYWYEQDSAKEWPQSKNCEYEDPPNEGDPFDYKAQADTFYMNVESVGSIPVDQVVVRGIDTLQKKVASILLALTQMDQDKVNFASGDNNTASNMLGSNEDVMMTGAEQDPYSNASQMGNTGSGGYDNAW

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 4 Entity 4 polymer

Description description	DNA-directed RNA polymerases I, II, and III subunit RPABC1
Molecular weight formula_weight	25117.1 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	E

MDQENERNISRLWRAFRTVKEMVKDRGYFITQEEVELPLEDFKAKYCDSMGRPQRKMMSFQANPTEESISKFPDMGSLWVEFCDEPSVGVKTMKTFVIHIQEKNFQTGIFVYQNNITPSAMKLVPSIPPATIETFNEAALVVNITHHELVPKHIRLSSDEKRELLKRYRLKESQLPRIQRADPVALYLGLKRGEVVKIIRKSETSGRYASYRICM

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 5 Entity 5 polymer

Description description	DNA-directed RNA polymerases I, II, and III subunit RPABC2
Molecular weight formula_weight	17931.8 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	F

MSDYEEAFNDGNENFEDFDVEHFSDEETYEEKPQFKDGETTDANGKTIVTGGNGPEDFQQHEQIRRKTLKEKAIPKDQRATTPYMTKYERARILGTRALQISMNAPVFVDLEGETDPLRIAMKELAEKKIPLVIRRYLPDGSFEDWSVEELIVDL

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 6 Entity 6 polymer

Description description	DNA-directed RNA polymerases I, II, and III subunit RPABC3
Molecular weight formula_weight	16525.4 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	H

MSNTLFDDIFQVSEVDPGRYNKVCRIEAASTTQDQCKLTLDINVELFPVAAQDSLTVTIASSLNLEDTPANDSSATRSWRPPQAGDRSLADDYDYVMYGTAYKFEEVSKDLIAVYYSFGGLLMRLEGNYRNLNNLKQENAYLLIRR

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 7 Entity 7 polymer

Description description	DNA-directed RNA polymerase II subunit RPB9
Molecular weight formula_weight	14308.2 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	I

MTTFRFCRDCNNMLYPREDKENNRLLFECRTCSYVEEAGSPLVYRHELITNIGETAGVVQDIGSDPTLPRSDRECPKCHSRENVFFQSQQRRKDTSMVLFFVCLSCSHIFTSDQKNKRTQFS

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 8 Entity 8 polymer

Description description	DNA-directed RNA polymerases I, II, and III subunit RPABC5
Molecular weight formula_weight	8290.7 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	J

MIVPVRCFSCGKVVGDKWESYLNLLQEDELDEGTALSRLGLKRYCCRRMILTHVDLIEKFLRYNPLEKRD

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 9 Entity 9 polymer

Description description	DNA-directed RNA polymerase II subunit RPB11
Molecular weight formula_weight	13633.5 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	K

MNAPDRFELFLLGEGESKLKIDPDTKAPNAVVITFEKEDHTLGNLIRAELLNDRKVLFAAYKVEHPFFARFKLRIQTTEGYDPKDALKNACNSIINKLGALKTNFETEWNLQTLAADDAF

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 10 Entity 10 polymer

Description description	DNA-directed RNA polymerases I, II, and III subunit RPABC4
Molecular weight formula_weight	7730.0 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	L

MSREGFQIPTNLDAAAAGTSQARTATLKYICAECSSKLSLSRTDAVRCKDCGHRILLKARTKRLVQFEAR

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Saccharomyces cerevisiae

Entity 11 Entity 11 polymer

Description description	Transcription initiation factor IIB
Molecular weight formula_weight	38257.3 kDa
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	M

MMTRESIDKRAGRRGPNLNIVLTCPECKVYPPKIVERFSEGDVVCALCGLVLSDKLVDTRSEWRTFSNDDHNGDDPSRVGEASNPLLDGNNLSTRIGKGETTDMRFTKELNKAQGKNVMDKKDNEVQAAFAKITMLCDAAELPKIVKDCAKEAYKLCHDEKTLKGKSMESIMAASILIGCRRAEVARTFKEIQSLIHVKTKEFGKTLNIMKNILRGKSEDGFLKIDTDNMSGAQNLTYIPRFCSHLGLPMQVTTSAEYTAKKCKEIKEIAGKSPITIAVVSIYLNILLFQIPITAAKVGQTLQVTEGTIKSGYKILYEHRDKLVDPQLIANGVVSLDNLPGVEKK

Source Source

Source organism organism	Saccharomyces cerevisiae
Common name common_name	yeast
NCBI taxonomy ID ncbi_taxonomy_id	4932
Host organism host_organism	Escherichia coli

Entity 12 Entity 12 non-polymer

Description description	ZINC ION
Molecular weight formula_weight	65.4 kDa
Source method src_method	syn
Copy count entity_count	9

▼

6. Fold Classification (SCOP + CATH) 17 domains

CATH v4.4 (17 domains)

Domain ID domain_id	3k7aB04
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1110 — Dna-directed Rna Polymerase Ii 140kd Polypeptide; Chain: B; domain 3
Homologous superfamily homologous superfamily	10 — RNA polymerase Rpb2, domain 2

Domain ID domain_id	3k7aB05
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1070 — Hypothetical Protein Ta0175; Chain: A, domain 2
Homologous superfamily homologous superfamily	20 —

Domain ID domain_id	3k7aB06
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	270 — Dna-directed Rna Polymerase Ii 140kd Polypeptide; Chain: B; Domain 6
Homologous superfamily homologous superfamily	10 — DNA-directed RNA polymerase, subunit 2, domain 6

Domain ID domain_id	3k7aB07
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily	150 — RNA polymerase II, Rpb2 subunit, wall domain

Domain ID domain_id	3k7aB08
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	1800 — DCoH-like
Homologous superfamily homologous superfamily	10 — RNA polymerase alpha subunit dimerisation domain

Domain ID domain_id	3k7aC01
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	3k7aC02
Class class	2 — Mainly Beta
Architecture architecture	170 — Beta Complex
Topology topology	120 — RNA Polymerase Alpha Subunit; Chain A, domain 2
Homologous superfamily homologous superfamily	12 — DNA-directed RNA polymerase, insert domain

Domain ID domain_id	3k7aE01
Class class	3 — Alpha Beta
Architecture architecture	40 — 3-Layer(aba) Sandwich
Topology topology	1340 — Dna-directed Rna Polymerases I, Ii, And Iii 27 Kd Polypeptide; Chain: A; domain 1
Homologous superfamily homologous superfamily	10 — RNA polymerase, Rpb5, N-terminal domain

Domain ID domain_id	3k7aE02
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	940 — Eukaryotic RPB6 RNA polymerase subunit
Homologous superfamily homologous superfamily	20 — RPB5-like RNA polymerase subunit

Domain ID domain_id	3k7aF00
Class class	3 — Alpha Beta
Architecture architecture	90 — Alpha-Beta Complex
Topology topology	940 — Eukaryotic RPB6 RNA polymerase subunit
Homologous superfamily homologous superfamily	10 — RNA polymerase subunit, RPB6/omega

Domain ID domain_id	3k7aH00
Class class	2 — Mainly Beta
Architecture architecture	40 — Beta Barrel
Topology topology	50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily	140 — Nucleic acid-binding proteins

Domain ID domain_id	3k7aI01
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	25 — N-terminal domain of TfIIb
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3k7aI02
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	25 — N-terminal domain of TfIIb
Homologous superfamily homologous superfamily	10 —

Domain ID domain_id	3k7aJ00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	10 — Arc Repressor Mutant, subunit A
Homologous superfamily homologous superfamily	60 — Homeodomain-like

Domain ID domain_id	3k7aK00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	1360 — Gyrase A; domain 2
Homologous superfamily homologous superfamily	10 — RNA polymerase, RBP11-like subunit

Domain ID domain_id	3k7aL00
Class class	2 — Mainly Beta
Architecture architecture	20 — Single Sheet
Topology topology	28 — Rubrerythrin, domain 2
Homologous superfamily homologous superfamily	30 — RNA polymerase ii, chain L

Domain ID domain_id	3k7aM01
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	472 — Cyclin A; domain 1
Homologous superfamily homologous superfamily	10 — Cyclin-like

▶

Unit-cell length a length_a	204.150 Å
Unit-cell length b length_b	216.210 Å
Unit-cell length c length_c	420.980 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	8

Space group space_group	I 2 2 2
Space-group number int_tables_number	23
Crystal system crystal_system	—

Resolution resolution	3.800 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	0.2680
R_work r_work	0.2630
R_free r_free	0.3130

Crystal Structure of an RNA polymerase II-TFIIB complex

1. Protein Identity and Related Structures Protein Identity & Related Structures

DNA-directed RNA polymerase II subunit RPB1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerase II subunit RPB2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerase II subunit RPB3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerases I, II, and III subunit RPABC1

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerases I, II, and III subunit RPABC2

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerases I, II, and III subunit RPABC3

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerase II subunit RPB9

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerases I, II, and III subunit RPABC5

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerase II subunit RPB11

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

DNA-directed RNA polymerases I, II, and III subunit RPABC4

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer