PMID- 10195894 OWN - NLM STAT- MEDLINE DCOM- 19990504 LR - 20190619 IS - 0036-8075 (Print) IS - 0036-8075 (Linking) VI - 284 IP - 5412 DP - 1999 Apr 9 TI - Positive and negative regulation of IkappaB kinase activity through IKKbeta subunit phosphorylation. PG - 309-13 AB - IkappaB [inhibitor of nuclear factor kappaB (NF-kappaB)] kinase (IKK) phosphorylates IkappaB inhibitory proteins, causing their degradation and activation of transcription factor NF-kappaB, a master activator of inflammatory responses. IKK is composed of three subunits-IKKalpha and IKKbeta, which are highly similar protein kinases, and IKKgamma, a regulatory subunit. In mammalian cells, phosphorylation of two sites at the activation loop of IKKbeta was essential for activation of IKK by tumor necrosis factor and interleukin-1. Elimination of equivalent sites in IKKalpha, however, did not interfere with IKK activation. Thus, IKKbeta, not IKKalpha, is the target for proinflammatory stimuli. Once activated, IKKbeta autophosphorylated at a carboxyl-terminal serine cluster. Such phosphorylation decreased IKK activity and may prevent prolonged activation of the inflammatory response. FAU - Delhase, M AU - Delhase M AD - Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0636, USA. FAU - Hayakawa, M AU - Hayakawa M FAU - Chen, Y AU - Chen Y FAU - Karin, M AU - Karin M LA - eng GR - R01 AI43477/AI/NIAID NIH HHS/United States GR - R37 ES04151/ES/NIEHS NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, Non-P.H.S. PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Science JT - Science (New York, N.Y.) JID - 0404511 RN - 0 (DNA-Binding Proteins) RN - 0 (I-kappa B Proteins) RN - 0 (Interleukin-1) RN - 0 (Tumor Necrosis Factor-alpha) RN - 17885-08-4 (Phosphoserine) RN - EC 2.7.11.1 (Protein-Serine-Threonine Kinases) RN - EC 2.7.11.10 (CHUK protein, human) RN - EC 2.7.11.10 (I-kappa B Kinase) RN - EC 2.7.11.10 (IKBKB protein, human) RN - EC 2.7.11.10 (IKBKE protein, human) RN - EC 2.7.11.25 (MAP Kinase Kinase Kinase 1) RN - EC 2.7.11.25 (MAP3K1 protein, human) RN - EC 2.7.11.25 (NF-kappa B kinase) SB - IM CIN - Science. 1999 Apr 9;284(5412):271-3. PMID: 10232975 MH - Amino Acid Sequence MH - Amino Acid Substitution MH - Cell Line MH - DNA-Binding Proteins/metabolism MH - Enzyme Activation MH - HeLa Cells MH - Helix-Loop-Helix Motifs MH - Humans MH - I-kappa B Kinase MH - I-kappa B Proteins MH - Interleukin-1/pharmacology MH - Leucine Zippers MH - *MAP Kinase Kinase Kinase 1 MH - Molecular Sequence Data MH - Mutation MH - Phosphorylation MH - Phosphoserine/metabolism MH - Protein-Serine-Threonine Kinases/chemistry/genetics/*metabolism MH - Transfection MH - Tumor Necrosis Factor-alpha/pharmacology EDAT- 1999/04/09 00:00 MHDA- 1999/04/09 00:01 CRDT- 1999/04/09 00:00 PHST- 1999/04/09 00:00 [pubmed] PHST- 1999/04/09 00:01 [medline] PHST- 1999/04/09 00:00 [entrez] AID - 10.1126/science.284.5412.309 [doi] PST - ppublish SO - Science. 1999 Apr 9;284(5412):309-13. doi: 10.1126/science.284.5412.309.