Definition | Prochlorococcus marinus str. MIT 9312, complete genome. |
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Accession | NC_007577 |
Length | 1,709,204 |
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The map label for this gene is alaS
Identifier: 78778430
GI number: 78778430
Start: 46058
End: 48718
Strand: Direct
Name: alaS
Synonym: PMT9312_0045
Alternate gene names: 78778430
Gene position: 46058-48718 (Clockwise)
Preceding gene: 78778426
Following gene: 78778432
Centisome position: 2.69
GC content: 31.38
Gene sequence:
>2661_bases ATGACATCTCAACTAATTAAAAAAATAGTTACTGGAGATGAGATAAGAAATGCTTTTTTAAAATTTTACAGTGAAAAATT ACATAAAATCATTCCAAGTGCATCTTTGATTCCAGATGACCCTACGGTTATGCTAACAATTGCTGGAATGCTACCTTTTA AACCAGTTTTTTTAGGTTTAAAAGAAAGACCATCAAAAAGGGCTACATCTAGCCAAAAGTGCATCAGAACAAATGATATA GAAAACGTTGGAGTTACAGCTAGACACCACACTTTTTTTGAAATGCTTGGTAATTTCTCTTTTGGAGATTATTTTAAACG AGAGGCTATTCAATGGGCTTGGGAATTAGTTACTAATATTTATCAACTTTCTGTTGAAAATATAATTGTGAGTGTTTTTC ACGAAGACGAAGAGTCTGCAAAAATTTGGAGAGATGAAATTGGTATTCATCCAGATAGGATAGTGAAACTAGGTGAGGAA GATAATTTTTGGTCATCTGGCAAAACAGGTCCATGTGGACCTTGTTCAGAACTTTATTATGATTTTCATCCTGAAAAGGG TCTGCAGAATATTGATTTAGAAGATGGAGATCGTTTTATTGAATTTTATAATCTTGTTTTTATGCAATATAATCGTGATT CTAATGGAAAATTGACAGATTTAAAATTTAAAAATATTGATACAGGAATGGGTCTTGAAAGGATGGCTCAAATACTACAA GAAAAGCAAAATAATTATGAGACAGATTTAATTTTTCCTATTATTCAAAAAATTTGTGAGATTGCAAATATTGATTATTT TTCTTCAGATGATAAAAACAAAATTTCTTTAAAAATCATTGGTGATCATACAAGAGCTGTGATTCATTTAATTTCTGATG GAGTAGCAGCAAGTAATCTCGGAAGGGGATATATATTAAGAAGGCTTATTAGAAGAATGGTCAGACATGGGAGATTATTA GGTATAACAAATGAATTTTTACCCCATATTGCTACTGTCGGGATCAATTTAATGCAAAATAATTATCCTGATTTAAAAAA TAATAATGATTTAATTTTGAATGAGATAAAAATTGAAGAAATAAGATTTAGGGAAACTCTTGAAAGAGGAGAGAAATTGC TAGATGAGTTAATTTCTTCAGGGCAGAAATTAATTTCTGGTTTTAAAGCTTTTGAACTTTATGATACTTATGGATTTCCT CTAGAACTTACTGTAGAAATTGCTGAAGAAAATAGTATCAGTGTAGATGTAAAGGGTTTTGAAGAAGAAATGAATGCACA AAAAGAGAGAGCTAAAGCTGCTTCAAGTAATATTGATTTAACTTTAGAGGGATCATTAGAGCGAGAAATAGATCTTTTTA ACAAAACTGTTTTTAATGGTTATGATTTACTCCTTTCGGAAGCTGAAATAAAGGGTATATTCTTGGATTCAACATTAGTA AAGCAAGCAAGTGAAGGACAGAAAGTTTTAATTGTTCTTGATCAGACAACTTTTTATGGAGAATCTGGCGGGCAAGTTGG TGATATTGGAACGATATTTTCAAAAGATTTAGAGGTCTTAGTTGATAATGTTATGCGAAAGAAAAATGTTTTTTTACATT ATGGAACGATCAAAAAAGGAATATTAACTATTGGACAAAAAGTCAAGACTAATGTTAGCTCCTCTAATAGAGCTAAGGCT GCTGCAAATCATACAGCTACTCATTTATTACAATCTGCACTTAAATCAGTTGTTAACGAAAGTGTTGGACAAAAAGGTTC ATTAGTAGCCTTTAATAAATTACGATTTGACTTTAATTCCTCTAATCCTATTTCTAAAGATCAAATTTCTAAGATTGAGA CTTTAGTTAACTCTTGGATTATGGAAAATCATGCCTTAGAAATAAAAAATATGTCTAAGAGTGAGGCTCTTGAAAAGGGC GCAGTCGCCATGTTTGGAGAAAAATATGATGATGAAGTGCGCGTTGTTAATGTACCAGGAGTTTCAATGGAACTTTGTGG TGGCACACATGTTAAAACTACATCCGAATTAGGTTCTTTCAAAATAATTAGCGAGGAAGGAATCTCAGCCGGCGTAAGAA GGATCGAGGCATTATCAGGCCAATCAGCATTAGACTATTTCAGTGATAGAAATGCTTTAGTAAATCAACTAAGTGATTTG TTAAAAGCAAATCCTAATCAACTTTTTGAAAGGGTTAATAATTTACAAGCAGAGCTTATTAATAAGAATAAAGAGATACA AAAAATGAAAGATGAAATTGCATATTTTAAATACTCTTCTATAAAATCCTCCGCAGAAATAGTAAATTCTTTTTCAATTT TAGTAAATCAGATTGATGGCTTAGATGGGAATTCTTTGCAATCTGCAGCACTTAATTTAACTTCTCATTTGGGAAATAAA GCAATAGTGATTCTTGGGGGAATACCAAATCCAGAAAATAGAAAGTTGTTATTTGTAGTTTCTTTAGGTGATGATCCAGT AAAAATAGGATTGCATGCAGGTAAAATAATTAATGAGATTGCAAGAATTTGTTCGGGAGGAGGAGGAGGAAAGCCTAACT TTGCTCAAGCAGGTGCTAAAGATATTGATAAGTTAAGTGATGCTCTAGATTATGCTAAAAATTATTTGCAAAAAACATTA GATAGTCATTCTGATAAATAA
Upstream 100 bases:
>100_bases AATAACTTTAGTTGTGTAGAATATAAATCCGCGTGATTATTTTTGCGAAATAACCGAAATTACGCTTTTCTTTAATTTTT AATCTTCTTATTCTGGATAA
Downstream 100 bases:
>100_bases CTACTTTTTCTGAGACTAATTTCGATTTGATCCATTAATTTCCTTGCTTCTTCAATAGTTAATTTTTTTTGATCAATTGC TGATTCAGTATTAATTCTTA
Product: alanyl-tRNA synthetase
Products: NA
Alternate protein names: Alanine--tRNA ligase; AlaRS [H]
Number of amino acids: Translated: 886; Mature: 885
Protein sequence:
>886_residues MTSQLIKKIVTGDEIRNAFLKFYSEKLHKIIPSASLIPDDPTVMLTIAGMLPFKPVFLGLKERPSKRATSSQKCIRTNDI ENVGVTARHHTFFEMLGNFSFGDYFKREAIQWAWELVTNIYQLSVENIIVSVFHEDEESAKIWRDEIGIHPDRIVKLGEE DNFWSSGKTGPCGPCSELYYDFHPEKGLQNIDLEDGDRFIEFYNLVFMQYNRDSNGKLTDLKFKNIDTGMGLERMAQILQ EKQNNYETDLIFPIIQKICEIANIDYFSSDDKNKISLKIIGDHTRAVIHLISDGVAASNLGRGYILRRLIRRMVRHGRLL GITNEFLPHIATVGINLMQNNYPDLKNNNDLILNEIKIEEIRFRETLERGEKLLDELISSGQKLISGFKAFELYDTYGFP LELTVEIAEENSISVDVKGFEEEMNAQKERAKAASSNIDLTLEGSLEREIDLFNKTVFNGYDLLLSEAEIKGIFLDSTLV KQASEGQKVLIVLDQTTFYGESGGQVGDIGTIFSKDLEVLVDNVMRKKNVFLHYGTIKKGILTIGQKVKTNVSSSNRAKA AANHTATHLLQSALKSVVNESVGQKGSLVAFNKLRFDFNSSNPISKDQISKIETLVNSWIMENHALEIKNMSKSEALEKG AVAMFGEKYDDEVRVVNVPGVSMELCGGTHVKTTSELGSFKIISEEGISAGVRRIEALSGQSALDYFSDRNALVNQLSDL LKANPNQLFERVNNLQAELINKNKEIQKMKDEIAYFKYSSIKSSAEIVNSFSILVNQIDGLDGNSLQSAALNLTSHLGNK AIVILGGIPNPENRKLLFVVSLGDDPVKIGLHAGKIINEIARICSGGGGGKPNFAQAGAKDIDKLSDALDYAKNYLQKTL DSHSDK
Sequences:
>Translated_886_residues MTSQLIKKIVTGDEIRNAFLKFYSEKLHKIIPSASLIPDDPTVMLTIAGMLPFKPVFLGLKERPSKRATSSQKCIRTNDI ENVGVTARHHTFFEMLGNFSFGDYFKREAIQWAWELVTNIYQLSVENIIVSVFHEDEESAKIWRDEIGIHPDRIVKLGEE DNFWSSGKTGPCGPCSELYYDFHPEKGLQNIDLEDGDRFIEFYNLVFMQYNRDSNGKLTDLKFKNIDTGMGLERMAQILQ EKQNNYETDLIFPIIQKICEIANIDYFSSDDKNKISLKIIGDHTRAVIHLISDGVAASNLGRGYILRRLIRRMVRHGRLL GITNEFLPHIATVGINLMQNNYPDLKNNNDLILNEIKIEEIRFRETLERGEKLLDELISSGQKLISGFKAFELYDTYGFP LELTVEIAEENSISVDVKGFEEEMNAQKERAKAASSNIDLTLEGSLEREIDLFNKTVFNGYDLLLSEAEIKGIFLDSTLV KQASEGQKVLIVLDQTTFYGESGGQVGDIGTIFSKDLEVLVDNVMRKKNVFLHYGTIKKGILTIGQKVKTNVSSSNRAKA AANHTATHLLQSALKSVVNESVGQKGSLVAFNKLRFDFNSSNPISKDQISKIETLVNSWIMENHALEIKNMSKSEALEKG AVAMFGEKYDDEVRVVNVPGVSMELCGGTHVKTTSELGSFKIISEEGISAGVRRIEALSGQSALDYFSDRNALVNQLSDL LKANPNQLFERVNNLQAELINKNKEIQKMKDEIAYFKYSSIKSSAEIVNSFSILVNQIDGLDGNSLQSAALNLTSHLGNK AIVILGGIPNPENRKLLFVVSLGDDPVKIGLHAGKIINEIARICSGGGGGKPNFAQAGAKDIDKLSDALDYAKNYLQKTL DSHSDK >Mature_885_residues TSQLIKKIVTGDEIRNAFLKFYSEKLHKIIPSASLIPDDPTVMLTIAGMLPFKPVFLGLKERPSKRATSSQKCIRTNDIE NVGVTARHHTFFEMLGNFSFGDYFKREAIQWAWELVTNIYQLSVENIIVSVFHEDEESAKIWRDEIGIHPDRIVKLGEED NFWSSGKTGPCGPCSELYYDFHPEKGLQNIDLEDGDRFIEFYNLVFMQYNRDSNGKLTDLKFKNIDTGMGLERMAQILQE KQNNYETDLIFPIIQKICEIANIDYFSSDDKNKISLKIIGDHTRAVIHLISDGVAASNLGRGYILRRLIRRMVRHGRLLG ITNEFLPHIATVGINLMQNNYPDLKNNNDLILNEIKIEEIRFRETLERGEKLLDELISSGQKLISGFKAFELYDTYGFPL ELTVEIAEENSISVDVKGFEEEMNAQKERAKAASSNIDLTLEGSLEREIDLFNKTVFNGYDLLLSEAEIKGIFLDSTLVK QASEGQKVLIVLDQTTFYGESGGQVGDIGTIFSKDLEVLVDNVMRKKNVFLHYGTIKKGILTIGQKVKTNVSSSNRAKAA ANHTATHLLQSALKSVVNESVGQKGSLVAFNKLRFDFNSSNPISKDQISKIETLVNSWIMENHALEIKNMSKSEALEKGA VAMFGEKYDDEVRVVNVPGVSMELCGGTHVKTTSELGSFKIISEEGISAGVRRIEALSGQSALDYFSDRNALVNQLSDLL KANPNQLFERVNNLQAELINKNKEIQKMKDEIAYFKYSSIKSSAEIVNSFSILVNQIDGLDGNSLQSAALNLTSHLGNKA IVILGGIPNPENRKLLFVVSLGDDPVKIGLHAGKIINEIARICSGGGGGKPNFAQAGAKDIDKLSDALDYAKNYLQKTLD SHSDK
Specific function: Catalyzes the attachment of alanine to tRNA(Ala) in a two-step reaction:alanine is first activated by ATP to form Ala- AMP and then transferred to the acceptor end of tRNA(Ala). Also edits incorrectly charged Ser-tRNA(Ala) and Gly-tRNA(Ala) via its editin
COG id: COG0013
COG function: function code J; Alanyl-tRNA synthetase
Gene ontology:
Cell location: Cytoplasm [H]
Metaboloic importance: Essential [C]
Operon status: Not Known
Operon components: None
Similarity: Belongs to the class-II aminoacyl-tRNA synthetase family [H]
Homologues:
Organism=Homo sapiens, GI109148542, Length=968, Percent_Identity=34.1942148760331, Blast_Score=480, Evalue=1e-135, Organism=Homo sapiens, GI38569417, Length=750, Percent_Identity=31.4666666666667, Blast_Score=374, Evalue=1e-103, Organism=Homo sapiens, GI217416402, Length=260, Percent_Identity=26.5384615384615, Blast_Score=72, Evalue=2e-12, Organism=Homo sapiens, GI13376886, Length=260, Percent_Identity=26.5384615384615, Blast_Score=72, Evalue=2e-12, Organism=Escherichia coli, GI1789048, Length=866, Percent_Identity=41.6859122401848, Blast_Score=671, Evalue=0.0, Organism=Caenorhabditis elegans, GI17506981, Length=969, Percent_Identity=33.0237358101135, Blast_Score=480, Evalue=1e-135, Organism=Caenorhabditis elegans, GI17536681, Length=756, Percent_Identity=32.9365079365079, Blast_Score=354, Evalue=1e-97, Organism=Saccharomyces cerevisiae, GI6324911, Length=892, Percent_Identity=34.7533632286996, Blast_Score=476, Evalue=1e-135, Organism=Drosophila melanogaster, GI24582809, Length=969, Percent_Identity=33.0237358101135, Blast_Score=497, Evalue=1e-140, Organism=Drosophila melanogaster, GI45552267, Length=969, Percent_Identity=33.0237358101135, Blast_Score=497, Evalue=1e-140, Organism=Drosophila melanogaster, GI24658214, Length=872, Percent_Identity=29.4724770642202, Blast_Score=330, Evalue=4e-90, Organism=Drosophila melanogaster, GI18543305, Length=264, Percent_Identity=25, Blast_Score=66, Evalue=9e-11,
Paralogues:
None
Copy number: NA
Swissprot (AC and ID): NA
Other databases:
- InterPro: IPR002318 - InterPro: IPR018162 - InterPro: IPR018165 - InterPro: IPR018164 - InterPro: IPR023033 - InterPro: IPR003156 - InterPro: IPR018163 - InterPro: IPR012947 [H]
Pfam domain/function: PF02272 DHHA1; PF01411 tRNA-synt_2c; PF07973 tRNA_SAD [H]
EC number: =6.1.1.7 [H]
Molecular weight: Translated: 98900; Mature: 98769
Theoretical pI: Translated: 5.89; Mature: 5.89
Prosite motif: PS50860 AA_TRNA_LIGASE_II_ALA
Important sites: NA
Signals:
None
Transmembrane regions:
None
Cys/Met content:
0.7 %Cys (Translated Protein) 1.8 %Met (Translated Protein) 2.5 %Cys+Met (Translated Protein) 0.7 %Cys (Mature Protein) 1.7 %Met (Mature Protein) 2.4 %Cys+Met (Mature Protein)
Secondary structure:
>Translated Secondary Structure MTSQLIKKIVTGDEIRNAFLKFYSEKLHKIIPSASLIPDDPTVMLTIAGMLPFKPVFLGL CCHHHHHHHHCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEECCCCCCHHHHCC KERPSKRATSSQKCIRTNDIENVGVTARHHTFFEMLGNFSFGDYFKREAIQWAWELVTNI CCCCCCCCCCCCCCHHCCCCCCCCCCHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHH YQLSVENIIVSVFHEDEESAKIWRDEIGIHPDRIVKLGEEDNFWSSGKTGPCGPCSELYY HHHHHHHHHEEEEECCCHHHHHHHHHCCCCHHHHEEECCCCCCCCCCCCCCCCCHHHHHC DFHPEKGLQNIDLEDGDRFIEFYNLVFMQYNRDSNGKLTDLKFKNIDTGMGLERMAQILQ CCCCCCCCCCCCCCCCHHHHHHHHHHHEEECCCCCCCEEEEEECCCCCCCCHHHHHHHHH EKQNNYETDLIFPIIQKICEIANIDYFSSDDKNKISLKIIGDHTRAVIHLISDGVAASNL HHHCCCCHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEECCHHHHHHHHHHCCCHHHCC GRGYILRRLIRRMVRHGRLLGITNEFLPHIATVGINLMQNNYPDLKNNNDLILNEIKIEE CHHHHHHHHHHHHHHCCCEEEEHHHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEEHHH IRFRETLERGEKLLDELISSGQKLISGFKAFELYDTYGFPLELTVEIAEENSISVDVKGF HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHEEECCCCCCEEEEEEEECCCCEEEEECCH EEEMNAQKERAKAASSNIDLTLEGSLEREIDLFNKTVFNGYDLLLSEAEIKGIFLDSTLV HHHHHHHHHHHHHHCCCCCEEECCCCHHHHHHHHHHHHCCHHHHEECCCCCEEEECHHHH KQASEGQKVLIVLDQTTFYGESGGQVGDIGTIFSKDLEVLVDNVMRKKNVFLHYGTIKKG HHCCCCCEEEEEEECCEEECCCCCCCCCHHHHHHHHHHHHHHHHHHHCCEEEEECCHHHH ILTIGQKVKTNVSSSNRAKAAANHTATHLLQSALKSVVNESVGQKGSLVAFNKLRFDFNS HHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEEEEECCC SNPISKDQISKIETLVNSWIMENHALEIKNMSKSEALEKGAVAMFGEKYDDEVRVVNVPG CCCCCHHHHHHHHHHHHHHHHHCCCEEECCCCHHHHHHCCCCEECCCCCCCCEEEEECCC VSMELCGGTHVKTTSELGSFKIISEEGISAGVRRIEALSGQSALDYFSDRNALVNQLSDL CEEEECCCCCEEEHHCCCCEEEECCCCHHHHHHHHHHHCCCHHHHHHHCHHHHHHHHHHH LKANPNQLFERVNNLQAELINKNKEIQKMKDEIAYFKYSSIKSSAEIVNSFSILVNQIDG HHCCHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCC LDGNSLQSAALNLTSHLGNKAIVILGGIPNPENRKLLFVVSLGDDPVKIGLHAGKIINEI CCCCCHHHHHHHHHHHCCCCEEEEECCCCCCCCCEEEEEEEECCCCEEEECHHHHHHHHH ARICSGGGGGKPNFAQAGAKDIDKLSDALDYAKNYLQKTLDSHSDK HHHHCCCCCCCCCHHHCCHHHHHHHHHHHHHHHHHHHHHHHCCCCC >Mature Secondary Structure TSQLIKKIVTGDEIRNAFLKFYSEKLHKIIPSASLIPDDPTVMLTIAGMLPFKPVFLGL CHHHHHHHHCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEECCCCCCHHHHCC KERPSKRATSSQKCIRTNDIENVGVTARHHTFFEMLGNFSFGDYFKREAIQWAWELVTNI CCCCCCCCCCCCCCHHCCCCCCCCCCHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHH YQLSVENIIVSVFHEDEESAKIWRDEIGIHPDRIVKLGEEDNFWSSGKTGPCGPCSELYY HHHHHHHHHEEEEECCCHHHHHHHHHCCCCHHHHEEECCCCCCCCCCCCCCCCCHHHHHC DFHPEKGLQNIDLEDGDRFIEFYNLVFMQYNRDSNGKLTDLKFKNIDTGMGLERMAQILQ CCCCCCCCCCCCCCCCHHHHHHHHHHHEEECCCCCCCEEEEEECCCCCCCCHHHHHHHHH EKQNNYETDLIFPIIQKICEIANIDYFSSDDKNKISLKIIGDHTRAVIHLISDGVAASNL HHHCCCCHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEECCHHHHHHHHHHCCCHHHCC GRGYILRRLIRRMVRHGRLLGITNEFLPHIATVGINLMQNNYPDLKNNNDLILNEIKIEE CHHHHHHHHHHHHHHCCCEEEEHHHHHHHHHHHHHHHHHCCCCCCCCCCCEEEEEEEHHH IRFRETLERGEKLLDELISSGQKLISGFKAFELYDTYGFPLELTVEIAEENSISVDVKGF HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHEEECCCCCCEEEEEEEECCCCEEEEECCH EEEMNAQKERAKAASSNIDLTLEGSLEREIDLFNKTVFNGYDLLLSEAEIKGIFLDSTLV HHHHHHHHHHHHHHCCCCCEEECCCCHHHHHHHHHHHHCCHHHHEECCCCCEEEECHHHH KQASEGQKVLIVLDQTTFYGESGGQVGDIGTIFSKDLEVLVDNVMRKKNVFLHYGTIKKG HHCCCCCEEEEEEECCEEECCCCCCCCCHHHHHHHHHHHHHHHHHHHCCEEEEECCHHHH ILTIGQKVKTNVSSSNRAKAAANHTATHLLQSALKSVVNESVGQKGSLVAFNKLRFDFNS HHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEEEEECCC SNPISKDQISKIETLVNSWIMENHALEIKNMSKSEALEKGAVAMFGEKYDDEVRVVNVPG CCCCCHHHHHHHHHHHHHHHHHCCCEEECCCCHHHHHHCCCCEECCCCCCCCEEEEECCC VSMELCGGTHVKTTSELGSFKIISEEGISAGVRRIEALSGQSALDYFSDRNALVNQLSDL CEEEECCCCCEEEHHCCCCEEEECCCCHHHHHHHHHHHCCCHHHHHHHCHHHHHHHHHHH LKANPNQLFERVNNLQAELINKNKEIQKMKDEIAYFKYSSIKSSAEIVNSFSILVNQIDG HHCCHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCC LDGNSLQSAALNLTSHLGNKAIVILGGIPNPENRKLLFVVSLGDDPVKIGLHAGKIINEI CCCCCHHHHHHHHHHHCCCCEEEEECCCCCCCCCEEEEEEEECCCCEEEECHHHHHHHHH ARICSGGGGGKPNFAQAGAKDIDKLSDALDYAKNYLQKTLDSHSDK HHHHCCCCCCCCCHHHCCHHHHHHHHHHHHHHHHHHHHHHHCCCCC
PDB accession: NA
Resolution: NA
Structure class: Unstructured
Cofactors: NA
Metal ions: NA
Kcat value (1/min): NA
Specific activity: NA
Km value (mM): NA
Substrates: NA
Specific reaction: NA
General reaction: NA
Inhibitor: NA
Structure determination priority: 9.0
TargetDB status: NA
Availability: NA
References: NA