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Title :   THE COMPLEX FORMED BETWEEN TET REPRESSOR AND TETRACYCLINE-MG2+ REVEALS MECHANISM OF ANTIBIOTIC RESISTANCE

Authors :   W. Hinrichs, C. Kisker, W. Saenger

Date :   02 Mar 95 (Deposition) - 03 Apr 96 (Release) - 13 Jul 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.10

Chains :   Asym. Unit : A
Biol. Unit 1: A  (2x)

Keywords :   Transcription Regulation (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   C. Kisker, W. Hinrichs, K. Tovar, W. Hillen, W. Saenger
The Complex Formed Between Tet Repressor And Tetracycline-Mg2+ Reveals Mechanism Of Antibiotic Resistance.
J. Mol. Biol. V. 247 260 1995
PubMed-ID: 7707374 | Reference-DOI: 10.1006/JMBI.1994.0138
(for further references see the PDB file header)

Molecule 1 - TETRACYCLINE REPRESSOR
	Chains	:	A
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PWH904 (K. TOVAR, PH.D. THESIS, UNIV. ERLANGEN-NUERNBERG, 1989)
	Expression System Strain	:	K12 DELTA H1 DELTA TRP
	Expression System Taxid	:	562
	Organism Scientific	:	ESCHERICHIA COLI
	Organism Taxid	:	562
	Other Details	:	REMAULT E.,STANSSENS P.,FIERS W. PLASMID VECTORS FOR HIGH-EFFICIENCY EXPRESSION CONTROLLED BY THE PL PROMOTER OF COLIPHAGE LAMBDA. GENE 15, 81-93 (1981).
	Synonym	:	TET REPRESSOR, CLASS D

		1
Asymmetric Unit	:	A
Biological Unit 1 (2x)	:	A

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (2, 2)

No.	Name	Count	Type	Full Name
1	CTC	1	Ligand/Ion	7-CHLOROTETRACYCLINE
2	MG	1	Ligand/Ion	MAGNESIUM ION

Biological Unit 1 (1, 2)

No.	Name	Count	Type	Full Name
1	CTC	2	Ligand/Ion	7-CHLOROTETRACYCLINE
2	MG	-1	Ligand/Ion	MAGNESIUM ION

Asymmetric Unit (2, 2)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	HIS A:100 , CTC A:222 , HOH A:224 , HOH A:225 , HOH A:226	BINDING SITE FOR RESIDUE MG A 223
2	AC2	SOFTWARE	HIS A:64 , SER A:67 , ASN A:82 , PHE A:86 , HIS A:100 , THR A:103 , ARG A:104 , VAL A:113 , GLN A:116 , ILE A:134 , SER A:138 , LEU A:170 , ALA A:173 , LEU A:174 , MG A:223 , HOH A:225 , HOH A:226 , HOH A:228 , HOH A:340	BINDING SITE FOR RESIDUE CTC A 222

(no "SS Bond" information available for 2TCT)

(no "Cis Peptide Bond" information available for 2TCT)

(no "SAP(SNP)/Variant" information available for 2TCT)

Asymmetric Unit (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	HTH_TETR_2	PS50977	TetR-type HTH domain profile.	TETR4_ECOLX	3-63	1	A:3-63
2	HTH_TETR_1	PS01081	TetR-type HTH domain signature.	TETR4_ECOLX	21-52	1	A:21-52

Biological Unit 1 (2, 4)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	HTH_TETR_2	PS50977	TetR-type HTH domain profile.	TETR4_ECOLX	3-63	2	A:3-63
2	HTH_TETR_1	PS01081	TetR-type HTH domain signature.	TETR4_ECOLX	21-52	2	A:21-52

(no "Exon" information available for 2TCT)

Asymmetric Unit

Reformat:	Number of residues per line = ('0' or empty: single-line sequence representation)
	Number of residues per labelling interval =
	UniProt sequence: complete aligned part

Show mapping:	SCOP domains	CATH domains	Pfam domains	Secondary structure (by author)
	SAPs(SNPs)	PROSITE motifs	Exons
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Chain A from PDB  Type:PROTEIN  Length:198
 aligned with TETR4_ECOLX | P0ACT4 from UniProtKB/Swiss-Prot  Length:218

    Alignment length:207
                                    11        21        31        41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201       
          TETR4_ECOLX     2 ARLNRESVIDAALELLNETGIDGLTTRKLAQKLGIEQPTLYWHVKNKRALLDALAVEILARHHDYSLPAAGESWQSFLRNNAMSFRRALLRYRDGAKVHLGTRPDEKQYDTVETQLRFMTENGFSLRDGLYAISAVSHFTLGAVLEQQEHTAALTDRPAAPDENLPPLLREALQIMDSDDGEQAFLHGLESLIRGFEVQLTALLQIV 208
               SCOP domains d2tcta1 A:2-67 Tetracyclin repressor (Tet-repressor, TetR)        d2tcta2 A:68-208 Tetracyclin repressor (Tet-repressor, TetR)                                                                                  SCOP domains
               CATH domains 2tctA01 A:2-66 Homeodomain-like                                  2tctA02 A:67-208 Tetracycline Repressor, domain 2                                                                                              CATH domains
               Pfam domains -------TetR_N-2tctA01 A:9-55                          ------------TetR_C-2tctA02 A:68-201                                                                                                               ------- Pfam domains
         Sec.struct. author ....hhhhhhhhhhhhhhh......hhhhhhhh...hhhhhhh...hhhhhhhhhhhhhhhh...........hhhhhhhhhhhhhhhhh....hhhhh......hhhhhhhhhhhhhhhh....hhhhhhhhhhhhhhhhhhhhhhhhhhh..---------...hhhhhhhhhh.....hhhhhhhhhhhhhhhhhhhhh..... Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) -HTH_TETR_2  PDB: A:3-63 UniProt: 3-63                        ------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE (1)
                PROSITE (2) -------------------HTH_TETR_1  PDB: A:21-52        ------------------------------------------------------------------------------------------------------------------------------------------------------------ PROSITE (2)
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2tct A   2 ARLNRESVIDAALELLNETGIDGLTTRKLAQKLGIEQPTLYWHVKNKRALLDALAVEILARHHDYSLPAAGESWQSFLRNNAMSFRRALLRYRDGAKVHLGTRPDEKQYDTVETQLRFMTENGFSLRDGLYAISAVSHFTLGAVLEQQEHTAAL---------NLPPLLREALQIMDSDDGEQAFLHGLESLIRGFEVQLTALLQIV 208
                                    11        21        31        41        51        61        71        81        91       101       111       121       131       141       151   |     -   |   171       181       191       201       
                                                                                                                                                                                   155       165

Legend:		→ Mismatch	(orange background)
	-	→ Gap	(green background, '-', border residues have a numbering label)
		→ Modified Residue	(blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
	x	→ Chemical Group	(purple background, 'x', labelled with number + name, e.g. ACE or NH2)
	extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '\|'

Asymmetric Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Mainly Alpha (13335)

Architecture: Orthogonal Bundle (10391)

Topology: Arc Repressor Mutant, subunit A (1030)

Homologous Superfamily: Homeodomain-like (288)

Escherichia coli. Organism_taxid: 562. (17)

2tctA01

A:2-66

Topology: Tetracycline Repressor; domain 2 (126)

Homologous Superfamily: Tetracycline Repressor, domain 2 (124)

Escherichia coli. Organism_taxid: 562. (10)

2tctA02

A:67-208

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: HTH (544)

Family: TetR_N (84)

Escherichia coli (12)

TetR_N-2tctA01

A:9-55

Clan: TetR_C (33)

Family: TetR_C (16)

Escherichia coli (12)

TetR_C-2tctA02

A:68-201

Asymmetric Unit(hide GO term definitions)

Chain A (TETR4_ECOLX | P0ACT4)

molecular function
	GO:0003677	DNA binding	Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
biological process
	GO:0045892	negative regulation of transcription, DNA-templated	Any process that stops, prevents, or reduces the frequency, rate or extent of cellular DNA-templated transcription.
	GO:0006355	regulation of transcription, DNA-templated	Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
	GO:0046677	response to antibiotic	Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an antibiotic stimulus. An antibiotic is a chemical substance produced by a microorganism which has the capacity to inhibit the growth of or to kill other microorganisms.
	GO:0006351	transcription, DNA-templated	The cellular synthesis of RNA on a template of DNA.

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