Protein Info for b3940 in Escherichia coli BW25113

Name: metL
Annotation: bifunctional aspartate kinase II/homoserine dehydrogenase II (NCBI)

These analyses and tools can help you predict a protein's function, but be skeptical. For enzymes, over 10% of annotations from KEGG or SEED are probably incorrect. For other types of proteins, the error rates may be much higher. MetaCyc and Swiss-Prot have low error rates, but the best hits in these databases are often quite distant, so this protein's function may not be the same. TIGRFam has low error rates. Finally, many experimentally-characterized proteins are not in any of these databases. To find relevant papers, use PaperBLAST.

Protein Families and Features

• PF00696: AA_kinase
  • amino acids 12 to 284 (273 residues), 145.3 bits, E=4e-46
• TIGR00657: aspartate kinase
  • amino acids 15 to 453 (439 residues), 212 bits, E=8.8e-67
• PF03447: NAD_binding_3
  • amino acids 465 to 600 (136 residues), 85.4 bits, E=7.3e-28
• PF00742: Homoserine_dh
  • amino acids 608 to 803 (196 residues), 150.8 bits, E=5.4e-48

Best Hits

Swiss-Prot: 100% identical to AK2H_ECOLI: Bifunctional aspartokinase/homoserine dehydrogenase 2 (metL) from Escherichia coli (strain K12)

KEGG orthology group: K12525, bifunctional aspartokinase / homoserine dehydrogenase 2 [EC: 1.1.1.3 2.7.2.4] (inferred from 100% identity to ecx:EcHS_A4174)

MetaCyc: 100% identical to fused aspartate kinase/homoserine dehydrogenase 2 (Escherichia coli K-12 substr. MG1655)
Aspartate kinase. [EC: 2.7.2.4]; Homoserine dehydrogenase. [EC: 2.7.2.4, 1.1.1.3]

Predicted SEED Role

"Aspartokinase (EC 2.7.2.4) / Homoserine dehydrogenase (EC 1.1.1.3)" in subsystem Lysine Biosynthesis DAP Pathway or Threonine and Homoserine Biosynthesis or Methionine Biosynthesis (EC 1.1.1.3, EC 2.7.2.4)

MetaCyc Pathways

• aspartate superpathway (24/25 steps found)
• superpathway of L-lysine, L-threonine and L-methionine biosynthesis I (18/18 steps found)
• superpathway of L-isoleucine biosynthesis I (13/13 steps found)
• L-lysine biosynthesis I (9/9 steps found)
• superpathway of S-adenosyl-L-methionine biosynthesis (9/9 steps found)
• superpathway of L-methionine biosynthesis (transsulfuration) (9/9 steps found)
• superpathway of L-homoserine and L-methionine biosynthesis (8/8 steps found)
• superpathway of L-lysine, L-threonine and L-methionine biosynthesis II (13/15 steps found)
• superpathway of L-threonine biosynthesis (6/6 steps found)
• superpathway of L-methionine biosynthesis (by sulfhydrylation) (10/12 steps found)
• L-lysine biosynthesis III (6/7 steps found)
• L-lysine biosynthesis VI (6/7 steps found)
• L-homoserine biosynthesis (3/3 steps found)
• dipicolinate biosynthesis (3/4 steps found)
• L-lysine biosynthesis II (6/9 steps found)
• chorismate biosynthesis II (archaea) (8/12 steps found)
• L-methionine biosynthesis IV (2/4 steps found)
• spermidine biosynthesis II (2/4 steps found)
• ectoine biosynthesis (2/5 steps found)
• 3-dehydroquinate biosynthesis II (archaea) (3/7 steps found)
• norspermidine biosynthesis (2/6 steps found)
• cremeomycin biosynthesis (2/7 steps found)
• grixazone biosynthesis (2/8 steps found)
• superpathway of polyamine biosynthesis III (2/8 steps found)
• platensimycin biosynthesis (6/26 steps found)

KEGG Metabolic Maps

• Biosynthesis of alkaloids derived from ornithine, lysine and nicotinic acid
• Biosynthesis of plant hormones
• Glycine, serine and threonine metabolism
• Lysine biosynthesis

Isozymes

Compare fitness of predicted isozymes for: 1.1.1.3, 2.7.2.4

Use Curated BLAST to search for 1.1.1.3 or 2.7.2.4

Sequence Analysis Tools

See P00562 at UniProt or InterPro

Protein Sequence (810 amino acids)

>b3940 bifunctional aspartate kinase II/homoserine dehydrogenase II (NCBI) (Escherichia coli BW25113)
MSVIAQAGAKGRQLHKFGGSSLADVKCYLRVAGIMAEYSQPDDMMVVSAAGSTTNQLINW
LKLSQTDRLSAHQVQQTLRRYQCDLISGLLPAEEADSLISAFVSDLERLAALLDSGINDA
VYAEVVGHGEVWSARLMSAVLNQQGLPAAWLDAREFLRAERAAQPQVDEGLSYPLLQQLL
VQHPGKRLVVTGFISRNNAGETVLLGRNGSDYSATQIGALAGVSRVTIWSDVAGVYSADP
RKVKDACLLPLLRLDEASELARLAAPVLHARTLQPVSGSEIDLQLRCSYTPDQGSTRIER
VLASGTGARIVTSHDDVCLIEFQVPASQDFKLAHKEIDQILKRAQVRPLAVGVHNDRQLL
QFCYTSEVADSALKILDEAGLPGELRLRQGLALVAMVGAGVTRNPLHCHRFWQQLKGQPV
EFTWQSDDGISLVAVLRTGPTESLIQGLHQSVFRAEKRIGLVLFGKGNIGSRWLELFARE
QSTLSARTGFEFVLAGVVDSRRSLLSYDGLDASRALAFFNDEAVEQDEESLFLWMRAHPY
DDLVVLDVTASQQLADQYLDFASHGFHVISANKLAGASDSNKYRQIHDAFEKTGRHWLYN
ATVGAGLPINHTVRDLIDSGDTILSISGIFSGTLSWLFLQFDGSVPFTELVDQAWQQGLT
EPDPRDDLSGKDVMRKLVILAREAGYNIEPDQVRVESLVPAHCEGGSIDHFFENGDELNE
QMVQRLEAAREMGLVLRYVARFDANGKARVGVEAVREDHPLASLLPCDNVFAIESRWYRD
NPLVIRGPGAGRDVTAGAIQSDINRLAQLL