Plasmids and Cultures

This database contains entries for 3,572 known and predicted gene coding sequences in Synechocystis sp PCC 6803 based on the Kazusa genome sequence and nomenclature (http://genome.microbedb.jp/cyanobase/GCA_000009725.1). Plasmids for generating marked mutants and mutant strains can be searched for by gene Name/Accession (e.g. 'sll1226' or '1513_sll1226-sacB'),  gene homology (e.g. 'hydrogenase large subunit'), Gene ID (e.g. hoxH), or by a portion of the gene coding sequence Sequence (CDS).

Please note, the library is still being completed. Plasmids and/or marked mutants may not be available. Users can also search for available materials by Plasmids made or Mutant made.

Plasmids, mutants and the unmarking spacer plasmid pUC19K-UL are currently available on request. Regardless of the segregation status of the mutant, open reception of a cyanobacterial mutant strain we recommend 1-2 cycles of restreaking on a selection plate containing kanamycin (100 μg/ml).

Name Sort ascending CDS Gene Homology Gene ID
2772_smr0002-sacB ATGTTAAGAGAACTAATTAAGCTCT… transposase
2771_slr0703-sacB ATGATAATTCGAGAATTTTACAGCA… transposase
2770_ssr1175-sacB ATGGCTTACAGTTTAGATTTAAGGC… transposase
2769_sll0676-sacB ATGGCTAAAAATGATTTGCAATCTC… DUF4334 domain-containing protein
2768_ssl1277-sacB ATGGAGCACTTCAGCAAGGGATTTT… transposase
2767_sll0677-sacB ATGATAATTCGAGAATTTTACAGCA… transposase
2766_sll0678-sacB ATGGATTACAGTCATCGTATTGTTA… hypothetical protein
2765_slr0702-sacB ATGTCTTCTAATTCGTCAAGTAAGT… hypothetical protein
2764_slr0701-sacB GTGAGCATTATGTTAACCGTCAGCG… mercuric resistance operon regulatory protein merR
2763_slr0700-sacB ATGACGGTACTGACTAATTCTTCTT… APC family permease
2762_slr0699-sacB ATGTTCAAAAATGGTTATTTACTAA… hypothetical protein
2761_slr0698-sacB ATGGCCATCGAGATTGAACGTAAAT… CYTH domain-containing protein
2760_slr0697-sacB ATGACCAAATTTTTTGTGGACCGGG… 5-oxoprolinase
2759_ssr1169-sacB GTGCGACAATTCTGTGCTCATTTTC… salt-stress induced hydrophobic peptide ESI3
2758_sll0775-sacB ATGAAAATTATCTTCAGTCCCAAAA… DUF4189 domain-containing protein
2757_sll0776-sacB ATGAATGTCCAAGTACTCGACCGTT… serine/threonine protein kinase pknA, spkD
2756_sll0777-sacB GTGGATTGCCAGTCAATTAGTAAAC… D-alanyl-D-alanine carboxypeptidase family protein
2755_sll0778-sacB ATGGTCATGAATCAAAATAATAGAC… ABC transporter
2754_sll0779-sacB ATGGCAATTTCCGCACAAAGTTTCA… PAS domain S-box protein
2753_sll0780-sacB ATGCAAATTTCAATTCCCGACTCGA… contain UPF0175 super family conserved domains
2752_sll0781-sacB ATGACAACACCTTTAGTTCCTCCCT… DUF1348 family protein
2751_sll0782-sacB GTGTTAGATTCTGCCCAGCTAATTT… putative protein kinase
2750_slr0801-sacB ATGAAAAAAAGCCACTATTCCGTCA… MSMEG_0569 family flavin-dependent oxidoreductase
2749_sll0783-sacB ATGCCAGAGGTAACTAAGCCAGCTC… MSMEG_0572 family nitrogen starvation response protein
2748_sll0784-sacB GTGCTGGGAAAAATCATGCTGAATT… nitrilase merR
2747_sll0785-sacB ATGAATAAGCAACGTCTCATCACAG… MSMEG_0568 family radical SAM protein
2746_sll0786-sacB GTGCGAAATGTGGCGCTTGTTCAGC… GNAT family N-acetyltransferase
2745_sll0787-sacB ATGTTAACTGACTTAATTATTGAAC… AIR synthase-like protein
2744_ssl1464-sacB ATGCCCGAAGTTACATTTGACATCG… MSMEG_0570 family nitrogen starvation response protein
2743_slr0800-sacB GTGAAAGGACGAAAGTGTCACCTAA… transposase
2742_slr0799-sacB ATGATTCCTCCCGCAAAGCCCGGAG… transposase
2741_sll0788-sacB GTGGGTAATCAATTCTGGATATATG… DUF305 domain-containing protein
2740_sll0789-sacB ATGAGACTGTTGCTGGTGGAGGATG… response regulator transcription factor, OmpR subfamily rre34
2739_sll0790-sacB ATGCAGAACAATAGATTATTCAATC… sensory transduction histidine kinase kikC/hik31
2738_slr0798-sacB ATGACCCAATCTTCACCGCTCAAAA… cadmium-translocating P-type ATPase cadA
2737_sll0792-sacB ATGAGTAAGTCCTCGTTGTCAAAGT… Zn(II)-sensing metalloregulatory transcriptional repressor, transcriptional repressor smtB/ziaR
2736_sll0793-sacB ATGATTCTGCGATCACTGCTTTATT… YnfA family protein
2735_slr0797-sacB ATGGTTGTAACTCCCCCTTCTTCTG… cation-transporting ATPase; E1-E2 ATPase
2734_sll0794-sacB ATGAAGACTAATCACTTAACGATTA… mercuric resistance operon regulatory protein; precorrin isomerase merR
2733_slr0796-sacB ATGGGCAAACTACCGCCTATCTTTC… nickel resistance nreB
2732_slr0795-sacB ATGGAGACCACATTGCTCCTTTTGT… hypothetical protein
2731_slr0794-sacB ATGTTAAATACGCTTCTCAATCAAA… CusA/CzcA family heavy metal efflux RND transporter
2730_slr0793-sacB GTGATGAAAACAATTCAATTAGCAA… hypothetical protein
2729_sll0797-sacB ATGCGAATTTTGCTGGTGGAAGATG… OmpR subfamily, response regulator transcription factor rre33
2728_sll0798-sacB ATGAATACCCGTCGCCTCTTTGCCC… sensory transduction histidine kinase hik30
2727_slr0790-sacB GTGGGATTGTTGAGGCGATCATCGT… UmuC protein umuC
2726_slr0789-sacB ATGGTTGACTACAGGAAAGCCCGAT… HPP family protein
2725_slr0788-sacB ATGAATACTAATCTCATTCTGGATG… nicotinate phosphoribosyltransferase
2724_slr0787-sacB ATGCAAACTAAATATCAATACGGGA… bifunctional nicotinamide-nucleotide adenylyltransferase/Nudix hydroxylase
2723_sll0800-sacB ATGTTTGACAATCTGTGCAAATTCC… contain a domain for predicted transposase
2722_slr0786-sacB GTGAACCATCAAAATTTGCTTTCAA… methionine aminopeptidase map
2721_ssl0511-sacB GTGAGACTTAAGATGGGGGGCAAAA… hypothetical protein
2720_slr0319-sacB ATGAATCATCGTTTCCTTTTACTTG… beta-lactamase blaOXA-3
2719_slr0318-sacB ATGAAAAACAAGATGAAACAGGACA… endoribonuclease L-PSP
2718_slr0317-sacB ATGAACCGGAAGATTTTAGTAACTG… SDR family oxidoreductase
2717_slr0316-sacB ATGGCAATTCTGAAACAATTAGGGA… CPBP family intramembrane metalloprotease
2716_slr0315-sacB ATGTTAAATATAGAAAATAAAGTAA… SDR family oxidoreductase
2715_slr0314-sacB ATGCCTTACGTTACTGTTGGTCAAG… bromoperoxidase, alpha/beta hydrolase
2714_slr0313-sacB ATGAGCAAAGATCGCAACCACGGTT… DsbA family protein
2713_slr0312-sacB ATGAGCCAAGCCACGACTATTCGGG… response regulator transcription factor,NarL subfamily rre32
2712_slr0311-sacB ATGAATTACTTGCACAAATATCATC… sensory transduction histidine kinase, PAS domain S-box protein hik29
2711_sll0280-sacB ATGGAAAAAGATCATTGTTCCCTCG… hypothetical protein
2710_sll0281-sacB ATGGTTGCCATCGATAATAATTTGA… DUF1822 family protein
2709_sll0282-sacB GTGCAAAAAAATCTGATGGCAATGC… hypothetical protein
2708_slr0309-sacB ATGGAGCACAAGCCAAACGAGTTTG… P-methylase, B12-binding domain-containing radical SAM protein
2707_sll0283-sacB ATGTTTAATTCCATTCGTCGGCTAT… hypothetical protein
2706_sll0284-sacB ATGTCAGACCATGCCCTCGGCTCCG… ATP-binding protein
2705_sll0286-sacB ATGGTTTTTTGGAAACGCTTTTTTA… GNAT family N-acetyltransferase
2704_slr0306-sacB ATGGTTAAAAATCAAGGGGCTTGGC… multifunctional 2'%2C3'-cyclic-nucleotide 2'-phosphodiesterase/5'-nucleotidase/3'-nucleotidase
2703_slr0305-sacB ATGGCCGATTATCTACTAAATGCTC… TVP38/TMEM64 family membrane protein
2702_slr0304-sacB ATGGTTCAACAATTAGAACGTAGTC… radical SAM/Cys-rich domain protein
2701_slr0303-sacB ATGACCTATCTGCAAACCACCGCCG… methyltransferase domain-containing protein
2700_slr0302-sacB ATGAGCGATCGCCACAAAACCAAAG… diguanylate cyclase
2699_slr0301-sacB ATGGTAAGTTCAGTCGTCGAAAAAA… phosphoenolpyruvate synthase ppsA
2698_slr0300-sacB ATGTATTCCACCATCCTCAAGCTAA… Uma2 family endonuclease
2697_slr0299-sacB ATGGAAATTCCCGTCCGCTATCAAC… hypothetical protein
2696_slr0298-sacB ATGGCTGTCTGTCCCACCTGTAATC… heterocyst to vegetative cell connection protein, FHA domain-containing protein fraH
2695_sll0288-sacB ATGAGTGACGACACACCCCATCCTG… septum site-determining protein; MinC minC
2694_sll0289-sacB ATGAATCGGATTATTGTTGTCACTT… septum site-determining protein; MinD minD
2693_ssl0546-sacB ATGATTTTGGAATTGATTGAAAGGC… septum site-determining protein; MinE minE
2692_sll0290-sacB ATGATCCAAGCTATGCCCTCTGCTC… polyphosphate kinase ppk
2691_slr0121-sacB ATGATTACTTCCATGCCCCGCCGTC… class A beta-lactamase
2690_slr0120-sacB GTGGAGCCCCAGGGGGAAAGAAATG… TrmJ/YjtD family RNA methyltransferase
2689_slr0119-sacB ATGGGGAACAATTTTGCCCAACTGA… YihY/virulence factor BrkB family protein brkB
2688_slr0118-sacB ATGAGAACTGCTTGGGTTGCTAAGC… ThiC protein thiC
2687_sll0092-sacB ATGACAAAGACAAGAGAGGCGAAAA… transposase
2686_ssl0172-sacB ATGACTCGAATACCAGATATTAAAT… transposase
2685_slr0116-sacB ATGGCCGTCACTGATTTAAGTTTGA… phycocyanobilin:ferredoxin oxidoreductase
2684_slr0115-sacB ATGCCTCGAATACTGATCATTGACG… response regulator for energy transfer from phycobilisomes to photosystems rpaA
2683_slr0114-sacB GTGATGTTCCGCCCCTTGTCCCGGG… hypothetical protein
2682_slr0112-sacB GTGGTCATGAGAAACGCTTTAACTA… hypothetical protein
2681_slr0111-sacB ATGGCCAGAAAAAGCTTATCGGATC… hypothetical protein
2680_slr0110-sacB GTGTCCACACCAAAGATTTTGGCAG… ParA family protein
2679_sll0094-sacB ATGGCAATCCACTATGCGTCCCTTG… sensory transduction histidine kinase
2678_sll0095-sacB ATGATGCTCATTTCGCAACCGATGG… AarF/ABC1/UbiB kinase family protein
2677_sll0096-sacB GTGATTTTAGTTGTGGGCGCCACCG… NAD-dependent epimerase/dehydratase family protein
2676_slr0109-sacB ATGATGTTAGATACCACATTTTTGT… mechanosensitive ion channel family protein
2675_slr0108-sacB ATGGCAATGGTTAGTTTTGCCTGGC… AsnC family protein
2674_sll0098-sacB ATGGCCCCTTCCCCCGCTCCTCTAC… 23S rRNA (adenine(2503)-C(2))-methyltransferase rlmN
2673_sll0099-sacB ATGATCCATGTGGTGGGCATTGGCC… precorrin-6y methylase cbiE
2672_sll0100-sacB GTGGAGCTAAAAAATTTAGCCCAAA… N-acyl-L-amino acid amidohydrolase ama
2671_sll0101-sacB ATGCTAGACATAAAACTCTCGTTAC… hypothetical protein
2670_slr0106-sacB ATGAAACAAGAAATTGGCGCTCTAC… hypothetical protein
2669_slr0105-sacB ATGTCTGATTCGTCTCTGAAACAAG… ATPase
2668_sll0102-sacB ATGACCCATTCCCCTGAATCCAACC… hypothetical protein
2667_sll0103-sacB ATGCGTATCGACCTTTCCTTGCTTT… VWA domain-containing protein
2666_slr0104-sacB ATGAAAGCAATTTTTGCCCTCCGCC… HD family phosphohydrolase
2665_slr0103-sacB ATGGCCCTTTCTCCCCTCTCCCGCT… hypothetical protein
2664_sll0107-sacB ATGTTGCGACAGCACCGGGCGATCG… bifunctional 4-hydroxy-2-oxoglutarate aldolase/2-dehydro-3-deoxy-phosphogluconate aldolase eda
2663_sll0108-sacB ATGTCTAATTCGATATTGTCTAAAC… ammonium/methylammonium permease amt1
2662_slr0099-sacB GTGAGAATGAGAAGCTTTGAATACT… transposase
2661_slr0626-sacB ATGTCTATGCCTCGCCTCAGCCTTT… tetratricopeptide repeat protein
2660_sll0109-sacB GTGGTGGACTGGAAAGTTCGGGCAA… chorismate mutase aroH
2659_slr0625-sacB ATGCTCAGTTTAATTAATGTTTTAT… sodium:glutamate symporter
2658_slr0624-sacB ATGCCTGTATCTCCCCTATCGGTTT… UDP-N-acetylglucosamine 2-epimerase (non-hydrolyzing)
2657_sll0584-sacB ATGAAGCCGATGCGGGAATCTTCCC… DUF1230 family protein ycf36
2656_sll0585-sacB ATGCCTAGAATTGAGGATAGGTTAA… asparaginase
2655_slr0623-sacB ATGAGTGCTACCCCTCAAGTTTCCG… thioredoxin trxA
2654_sll0586-sacB ATGACAAGAACTGTGATTGTGGTCG… NAD(P)/FAD-dependent oxidoreductase
2653_sll0587-sacB GTGCCAGCCCTGATTAACCCGGTGA… pyruvate kinase pykF
2652_sll0588-sacB ATGTCATTATTCCCTCTTTTAACCG… hypothetical protein
2651_ssr1041-sacB ATGGCAGTAACGATACACTTTTTGC… (2Fe-2S)-binding protein
2650_slr0619-sacB ATGATGAAACGAATTGCTGTAGAAG… amidohydrolase
2649_slr0618-sacB ATGGAGCCATACAGTCATAGAATGG… cobyric acid synthase cbiP/ cpbQ
2648_sll0590-sacB ATGAAAAGAATTGGTCACATGTTGG… mechanosensitive ion channel family protein
2647_slr0617-sacB ATGATTAACGGAAAGCCCCAACCTC… hypothetical protein
2646_ssr1038-sacB ATGAATACCACATCTCCCATTGACT… hypothetical protein
2645_slr0616-sacB ATGTCTGAACCGAAACCAAGCCAGC… MFS transporter
2644_slr0615-sacB ATGGCCGCCCCCAGCGTCAAGCAGT… ABC transporter ATP-binding protein
2643_sll0593-sacB ATGGGGGCCATGGGCGTAAATTTTT… glucokinase glk
2642_sll0594-sacB ATGTTTGTGAACAGTTCCCCGATCG… transcriptional regulatory protein
2641_sll0595-sacB ATGGTCTGGGCAAACCTTGGGCACT… hypothetical protein
2640_sll0596-sacB ATGCAATTGCACCTCTCCACCTGGC… creatininase family protein
2639_sll0597-sacB GTGAACATTGCCCCCGTAGTTGATA… AI-2E family transporter
2638_sll0467-sacB ATGGACCAGGACAAATATCTTAGTA… queuosine biosynthesis protein; QueA queA
2637_slr0523-sacB ATGTCGAATTTTTCCCGAGCCGTTG… dethiobiotin synthetase BioD
2636_sll0469-sacB GTGTCTGCCGTGAGCCGTATCGCTA… ribose-phosphate pyrophosphokinase prsA
2635_sll0470-sacB ATGTCTATGCCATCTATGCCTAAAT… DUF2808 domain-containing protein
2634_sll0471-sacB ATGATTACCTACTGCCGCCGAACTG… FAD-dependent oxidoreductase
2633_slr0522-sacB ATGAAGACTTCTATTTTATCTGCAT… hypothetical protein
2632_slr0521-sacB ATGGCCTGGCCATGTTTATCAGTTA… hypothetical protein
2631_slr0520-sacB ATGACCAGTTTTGGTATTATTGTTT… phosphoribosyl formylglycinamidine synthase purL/purQ
2630_slr0519-sacB GTGGCAGATTCCCCGGTAAGGCCCT… phosphoribosylformylglycinamidine synthase subunit purS
2629_slr0518-sacB ATGAAACTTTTACCACTTCTCCCCC… arabinofuranosidase abfB
2628_slr0517-sacB ATGGAAAAATCACCGTTGAGTCCCC… GNAT family N-acetyltransferase
2627_sll0473-sacB GTGTTGGCCGGAATAGGTGCATTGA… hypothetical protein
2626_sll0474-sacB ATGGTTCAGGAGAAACCACGTTTTA… sensory transduction histidine kinase hik28
2625_slr0516-codA ATGAATAACAAAAAACTCAGCCTAA… pentapeptide repeat-containing protein
2624_slr0514-sacB ATGGTTTTGGCAGGATCAAACGCCG… hypothetical protein
2623_slr0513-sacB ATGACAACTAAGATTTCCCGGCGGA… Fe(3+) ABC transporter substrate-binding protein
2622_sll0477-sacB GTGCTGGATAATTGCAAGAGATTAT… MotA/TolQ/ExbB proton channel family protein
2621_sll0478-sacB ATGAAAAGCCGAGTCAGGGGGGCAA… biopolymer transporter ExbD exbD
2620_sll0479-sacB ATGAAATTTAGACACCGACAAGACC… biopolymer transporter ExbD exbD
2619_slr0511-sacB ATGATAATCCGAGAATTTTACAGCA… transposase
2618_ssr0871-sacB GTGAGAAGCTTTGAATACTTTAAAT… transposase
2617_slr0510-sacB GTGATTGCACAAATTAATCCACCAC… mechanosensitive ion channel
2616_slr0509-sacB ATGTCCCAGTGGATCACAGAATGGA… alkaline phosphatase like protein
2615_sll0480-sacB ATGGCCAGTATCAACGACAACTATC… LL-diaminopimelate aminotransferase
2614_sll0481-sacB ATGGTGCAGTCAACCGTCGAACTTT… hypothetical protein
2613_sll0482-sacB ATGCCAATGGCGCTTTGGGGCATCG… DUF2974 domain-containing protein
2612_slr0506-sacB ATGGAACAACCGATGAAACCCACGG… protochlorophyllide oxido-reductase pcr
2611_slr0505-sacB GTGAACAGGGTGAGAATTTGGAGTA… biopolymer transporter Tol
2610_slr0503-sacB ATGGTAAATTTCGGGCTTAATTCAG… Ycf66-like protein
2609_slr0502-sacB ATGCACAAAATCCCCGTTACCGTAG… CobW protein cobW
2608_sll0484-sacB ATGGCAATGCTTCTTTCCTCCCCCT… ABC transporter
2607_sll0485-sacB ATGACCCAGGAGCCCTACCAAATTC… NarL subfamily
2606_sll0486-sacB ATGGATATGAATAGGATTGTGTTAA… circadian clock protein KaiB
2605_sll0487-sacB ATGTTGTCCAACTCCGACCAGCACC… class I SAM-dependent methyltransferase
2604_sll0488-sacB ATGGTTCAGGTCGTTGATGATCCGA… Uma2 family endonuclease
2603_slr0500-sacB ATGCCGGAGTCATCCACCCCTTCCC… imidazoleglycerol-phosphate dehydratase hisB
2602_sll0489-sacB ATGATTGAGGTTGAACATCTCAGCA… ABC transporter ATP-binding protein
2601_slr0498-sacB ATGTTTGGCAAATATCGACAGAAAA… two pore domain potassium channel family protein
2600_slr0096-sacB ATGGCTACTACCCTGCTTTCCCCCA… low affinity sulfate transporter
2599_slr0095-sacB ATGGGTAAGGGCATCACCGGTTTTG… O-methyltransferase
2598_slr0093-sacB ATGGCATCAACAGATTTCAAAGACT… DnaJ protein dnaJ
2597_slr0092-sacB ATGGCCGACCGTCCCCAGTTGAGTA… glycosyltransferase
2596_slr0091-sacB ATGAATACTGCTAAAACTGTTGTTG… aldehyde dehydrogenase
2595_slr0090-sacB ATGGAATTCGACTATCTTCATTTAT… 4-hydroxyphenylpyruvic acid dioxgenase hppD
2594_slr0089-sacB ATGGTTTACCATGTTAGGCCTAAGC… delta(24)-sterol C-methyltransferase erg6
2593_slr0088-sacB ATGATCACCACCGATGTTGTCATTA… b-carotene ketolase crtO
2592_slr0086-sacB GTGCCCTACGCCATTGATTTTGGTA… Hsp70 family protein
2591_sll0078-sacB ATGGCCAAAACCGTAGTTTCCCCCG… threonyl-tRNA synthetase thrS
2590_slr0084-sacB ATGGGTTACATCGCCGTCGTTGATT… N-acetyl-glutamate-gamma-semialdehyde dehydrogenase hisH
2589_sll0080-sacB ATGGGGAATGAAAAAGCTAGAGTCG… N-acetyl-gamma-glutamyl-phosphate reductase argC
2588_slr0083-sacB ATGACTAATACTTTGACTAGTACCT… ATP-dependent RNA helicase; DeaD deaD
2587_slr0082-sacB ATGGGCCAAACGCCAACGATCGCCA… 30S ribosomal protein S12 methylthiotransferase RimO rimO
2586_slr0081-sacB ATGTTGGTTAAATACCATCTAGTAG… two-component response regulator OmpR subfamily hisB, phoB, rre29, sph
2585_slr0080-sacB ATGGCCTCTACCCCCAATTCCGTAA… ribonuclease H rnhA
2584_sll0082-sacB GTGAACGAAGAGCGTTTTGCCGACA… hypothetical protein
2583_slr0079-sacB ATGGTCTTTTCCTCCGATTCCCCCG… general secretion pathway protein E gspE/pilB2
2582_slr0078-sacB ATGTGGATTATTTATAAGGAGTTTT… 6-carboxytetrahydropterin synthase QueD queD
2581_sll0083-sacB ATGTCTGAATGGGTTGAACAGCGTT… D-sedoheptulose 7-phosphate isomerase gmhA
2580_sll0084-sacB GTGCAGTTACCGGCCGGTGCCGGGG… imidazoleglycerol-phosphate dehydratase; histidinol-phosphatase hisB
2579_sll0085-sacB ATGAACTCTGACCATTCTCGGGATC… hypothetical protein
2578_sll0086-sacB ATGCGCGTAATTCTGATGACAGGTA… arsenic-transporting ATPase
2577_slr0077-sacB ATGGTTGCTCTCCAAATTCCCAGCC… SufS family cysteine desulfurase nifS/sufE
2576_slr0076-sacB ATGACCGCCGCGATTTTAGCCGATG… Fe-S cluster assembly protein sufD
2575_slr0075-sacB ATGAGCCAGACTATTCTTTCCATTA… Fe-S cluster assembly ATPase sufC
2574_slr0074-sacB ATGAGTTCCACCACTGTTAAAAACC… Fe-S cluster assembly protein sufB
2573_sll0088-sacB ATGGGGGTTGTCCTTTCAGTTTACT… iron-sulfur cluster biosynthesis transcriptional regulator sufR