2NP7 - JenaLib

Title :   CRYSTAL STRUCTURE OF THE ADENINE-SPECIFIC DNA METHYLTRANSFERASE M.TAQI COMPLEXED WITH THE COFACTOR ANALOG AETA AND A 10 BP DNA CONTAINING AN ABASIC SITE ANALOG AT THE TARGET POSITION AND PYRROLO-DC AT THE TARGET BASE PARTNER POSITION

Authors :   T. Lenz, A. J. Scheidig, E. Weinhold

Date :   26 Oct 06 (Deposition) - 13 Nov 07 (Release) - 13 Jul 11 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.90

Chains :   Asym./Biol. Unit : A,B,C

Keywords :   Dna, Dna Methyltransferase, Target Base Partner, Pyrrolo-Dc, Abasic Site Analog, Base Flipping, Nucleotide Flipping, Transferase-Dna Complex (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   T. Lenz, A. J. Scheidig, E. Weinhold
Caught In The Act Ii: Visualization Of An Intermediate In The Dna Base-Flipping Pathway Induced By The Adenine-Specific Dna Methyltransferase M. Taqi
To Be Published
PubMed: search
(for further references see the PDB file header)

Compounds

Molecule 1 - MODIFICATION METHYLASE TAQI
	Chains	:	A
	EC Number	:	2.1.1.72
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Plasmid	:	PA1/MTAQ-A49A
	Expression System Strain	:	ER2267
	Expression System Taxid	:	562
	Expression System Vector Type	:	PLASMID
	Gene	:	TAQIM
	Organism Scientific	:	THERMUS AQUATICUS
	Organism Taxid	:	271
	Strain	:	YT1
	Synonym	:	ADENINE-SPECIFIC METHYLTRANSFERASE TAQI, M.TAQI

*Molecule 2 - 5'-D(GPTPTPCPGP(3DR)PTPGPTPC)-3'*
	Chains	:	B
	Engineered	:	YES
	Other Details	:	DNA TARGET STRAND CONTAINING AN ABASIC SITE ANALOG AT THE TARGET POSITION
	Other Details - Source	:	SOLID-PHASE DNA SYNTHESIS
	Synthetic	:	YES

*Molecule 3 - 5'-D(GPAPCPAP(4PC)PCPGP(6MA)PAPC)-3'*
	Chains	:	C
	Engineered	:	YES
	Other Details	:	DNA PARTNER STRAND CONTAINING N6-METHYLADENINE AND PYRROLO-DC AT THE TARGET BASE PARTNER POSITION
	Other Details - Source	:	SOLID-PHASE DNA SYNTHESIS
	Synthetic	:	YES

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (5, 6)

Sites (0, 0)

SS Bonds (0, 0)

Cis Peptide Bonds (0, 0)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

PROSITE Motifs (1, 1)

Exons (0, 0)

Sequences/Alignments

Asymmetric/Biological 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

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Chain A from PDB  Type:PROTEIN  Length:393
 aligned with MTTA_THEAQ | P14385 from UniProtKB/Swiss-Prot  Length:421

    Alignment length:393
                                    30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410   
           MTTA_THEAQ    21 VETPPEVVDFMVSLAEAPRGGRVLEPACAHGPFLRAFREAHGTAYRFVGVEIDPKALDLPPWAEGILADFLLWEPGEAFDLILGNPPYGIVGEASKYPIHVFKAVKDLYKKAFSTWKGKYNLYGAFLEKAVRLLKPGGVLVFVVPATWLVLEDFALLREFLAREGKTSVYYLGEVFPQKKVSAVVIRFQKSGKGLSLWDTQESESGFTPILWAEYPHWEGEIIRFETEETRKLEISGMPLGDLFHIRFAARSPEFKKHPAVRKEPGPGLVPVLTGRNLKPGWVDYEKNHSGLWMPKERAKELRDFYATPHLVVAHTKGTRVVAAWDERAYPWREEFHLLPKEGVRLDPSSLVQWLNSEAMQKHVRTLYRDFVPHLTLRMLERLPVRREYGFHT 413
               SCOP domains d2np7a1 A:21-243 DNA methylase TaqI, N-terminal domain                                                                                                                                                                         d2np7a2 A:244-413 DNA methylase TaqI, C-terminal domain                                                                                                                    SCOP domains
               CATH domains 2np7A01 A:21-243 Vaccinia Virus protein VP39                                                                                                                                                                                   2np7A02 A:244-408 Adenine-n6-DNA-methyltransferase Taqi, Chain A, domain 2                                                                                           ----- CATH domains
               Pfam domains -------------------Methyltransf_26-2np7A01 A:40-166                                                                                               ---------------------------------------------------------------------------------------------------------------------------TaqI_C-2np7A02 A:290-405                                                                                            -------- Pfam domains
         Sec.struct. author ...hhhhhhhhhhhh......eeeee....hhhhhhhhhhhh...eeeeee...........eeeee.hhhhh.....eeeeee.................hhhhhhhhhhhh.......hhhhhhhhhhhhheeeeeeeeeeee.hhhhhhhhhhhhhhhhhhheeeeeeee.........eeeeeee.....eeeeeeeee..eeeeeeeeee...........hhhhhhhhhhhee....eeeee..hhhhhhh............ee..hhh.ee..ee.........eehhhhhhhhhhhhhh.eeee.........eeee.........eeeee......hhhhhhhhhhhhhhhhhhhhhhh......hhhhhhh.ee........ Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------------------------N6_MTAS----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 2np7 A  21 VETPPEVVDFMVSLAEAPRGGRVLEPACAHGPFLRAFREAHGTAYRFVGVEIDPKALDLPPWAEGILADFLLWEPGEAFDLILGNPPYGIVGEASKYPIHVFKAVKDLYKKAFSTWKGKYNLYGAFLEKAVRLLKPGGVLVFVVPATWLVLEDFALLREFLAREGKTSVYYLGEVFPQKKVSAVVIRFQKSGKGLSLWDTQESESGFTPILWAEYPHWEGEIIRFETEETRKLEISGMPLGDLFHIRFAARSPEFKKHPAVRKEPGPGLVPVLTGRNLKPGWVDYEKNHSGLWMPKERAKELRDFYATPHLVVAHTKGTRVVAAWDERAYPWREEFHLLPKEGVRLDPSSLVQWLNSEAMQKHVRTLYRDFVPHLTLRMLERLPVRREYGFHT 413
                                    30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410

Chain B from PDB  Type:DNA  Length:10
                                          
                 2np7 B   1 GTTCGxTGTC  10
                                 |  10
                                 6-3DR

Chain C from PDB  Type:DNA  Length:10
                                          
                 2np7 C  11 GACAcCGaAC  20
                                |  |20
                               15-4PC 
                                  18-6MA

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Classification and Annotation

SCOP Domains (2, 2)

CATH Domains (2, 2)

Pfam Domains (2, 2)

Gene Ontology (10, 10)

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (MTTA_THEAQ | P14385)

molecular function
	GO:0003677	DNA binding	Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
	GO:0003824	catalytic activity	Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.
	GO:0008168	methyltransferase activity	Catalysis of the transfer of a methyl group to an acceptor molecule.
	GO:0003676	nucleic acid binding	Interacting selectively and non-covalently with any nucleic acid.
	GO:0009007	site-specific DNA-methyltransferase (adenine-specific) activity	Catalysis of the reaction: S-adenosyl-L-methionine + DNA adenine = S-adenosyl-L-homocysteine + DNA 6-methylaminopurine.
	GO:0016740	transferase activity	Catalysis of the transfer of a group, e.g. a methyl group, glycosyl group, acyl group, phosphorus-containing, or other groups, from one compound (generally regarded as the donor) to another compound (generally regarded as the acceptor). Transferase is the systematic name for any enzyme of EC class 2.
biological process
	GO:0032775	DNA methylation on adenine	The covalent transfer of a methyl group to N-6 of adenine in a DNA molecule.
	GO:0006304	DNA modification	The covalent alteration of one or more nucleotide sites in DNA, resulting in a change in its properties.
	GO:0009307	DNA restriction-modification system	A defense process found in many bacteria and archaea that protects the organism from invading foreign DNA by cleaving it with a restriction endonuclease. The organism's own DNA is protected by methylation of a specific nucleotide, which occurs immediately following replication, in the same target site as the restriction enzyme.
	GO:0032259	methylation	The process in which a methyl group is covalently attached to a molecule.

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