Complement factor B

NameComplement factor B
Synonyms
  • 3.4.21.47
  • BF
  • BFD
  • C3/C5 convertase
  • GBG
  • Glycine-rich beta glycoprotein
  • PBF2
  • Properdin factor B
Gene NameCFB
OrganismHuman
Amino acid sequence
>lcl|BSEQ0003373|Complement factor B
MGSNLSPQLCLMPFILGLLSGGVTTTPWSLARPQGSCSLEGVEIKGGSFRLLQEGQALEY
VCPSGFYPYPVQTRTCRSTGSWSTLKTQDQKTVRKAECRAIHCPRPHDFENGEYWPRSPY
YNVSDEISFHCYDGYTLRGSANRTCQVNGRWSGQTAICDNGAGYCSNPGIPIGTRKVGSQ
YRLEDSVTYHCSRGLTLRGSQRRTCQEGGSWSGTEPSCQDSFMYDTPQEVAEAFLSSLTE
TIEGVDAEDGHGPGEQQKRKIVLDPSGSMNIYLVLDGSDSIGASNFTGAKKCLVNLIEKV
ASYGVKPRYGLVTYATYPKIWVKVSEADSSNADWVTKQLNEINYEDHKLKSGTNTKKALQ
AVYSMMSWPDDVPPEGWNRTRHVIILMTDGLHNMGGDPITVIDEIRDLLYIGKDRKNPRE
DYLDVYVFGVGPLVNQVNINALASKKDNEQHVFKVKDMENLEDVFYQMIDESQSLSLCGM
VWEHRKGTDYHKQPWQAKISVIRPSKGHESCMGAVVSEYFVLTAAHCFTVDDKEHSIKVS
VGGEKRDLEIEVVLFHPNYNINGKKEAGIPEFYDYDVALIKLKNKLKYGQTIRPICLPCT
EGTTRALRLPPTTTCQQQKEELLPAQDIKALFVSEEEKKLTRKEVYIKNGDKKGSCERDA
QYAPGYDKVKDISEVVTPRFLCTGGVSPYADPNTCRGDSGGPLIVHKRSRFIQVGVISWG
VVDVCKNQKRQKQVPAHARDFHINLFQVLPWLKEKLQDEDLGFL
Number of residuesNone
Molecular Weight85532.325
Theoretical pI7.07
GO Classification
Functions
  • serine-type endopeptidase activity
  • complement binding
Processes
  • complement activation
  • regulation of complement activation
  • innate immune response
  • complement activation, alternative pathway
Components
  • extracellular region
  • plasma membrane
  • extracellular space
  • extracellular exosome
  • blood microparticle
General FunctionSerine-type endopeptidase activity
Specific FunctionFactor B which is part of the alternate pathway of the complement system is cleaved by factor D into 2 fragments: Ba and Bb. Bb, a serine protease, then combines with complement factor 3b to generate the C3 or C5 convertase. It has also been implicated in proliferation and differentiation of preactivated B-lymphocytes, rapid spreading of peripheral blood monocytes, stimulation of lymphocyte blastogenesis and lysis of erythrocytes. Ba inhibits the proliferation of preactivated B-lymphocytes.
Transmembrane Regions
GenBank Protein ID
UniProtKB IDP00751
UniProtKB Entry Name
Cellular LocationSecreted
Gene sequence
>lcl|BSEQ0021670|Complement factor B (CFB)
ATGGGGAGCAATCTCAGCCCCCAACTCTGCCTGATGCCCTTTATCTTGGGCCTCTTGTCT
GGAGGTGTGACCACCACTCCATGGTCTTTGGCCCGGCCCCAGGGATCCTGCTCTCTGGAG
GGGGTAGAGATCAAAGGCGGCTCCTTCCGACTTCTCCAAGAGGGCCAGGCACTGGAGTAC
GTGTGTCCTTCTGGCTTCTACCCGTACCCTGTGCAGACACGTACCTGCAGATCTACGGGG
TCCTGGAGCACCCTGAAGACTCAAGACCAAAAGACTGTCAGGAAGGCAGAGTGCAGAGCA
ATCCACTGTCCAAGACCACACGACTTCGAGAACGGGGAATACTGGCCCCGGTCTCCCTAC
TACAATGTGAGTGATGAGATCTCTTTCCACTGCTATGACGGTTACACTCTCCGGGGCTCT
GCCAATCGCACCTGCCAAGTGAATGGCCGATGGAGTGGGCAGACAGCGATCTGTGACAAC
GGAGCGGGGTACTGCTCCAACCCGGGCATCCCCATTGGCACAAGGAAGGTGGGCAGCCAG
TACCGCCTTGAAGACAGCGTCACCTACCACTGCAGCCGGGGGCTTACCCTGCGTGGCTCC
CAGCGGCGAACGTGTCAGGAAGGTGGCTCTTGGAGCGGGACGGAGCCTTCCTGCCAAGAC
TCCTTCATGTACGACACCCCTCAAGAGGTGGCCGAAGCTTTCCTGTCTTCCCTGACAGAG
ACCATAGAAGGAGTCGATGCTGAGGATGGGCACGGCCCAGGGGAACAACAGAAGCGGAAG
ATCGTCCTGGACCCTTCAGGCTCCATGAACATCTACCTGGTGCTAGATGGATCAGACAGC
ATTGGGGCCAGCAACTTCACAGGAGCCAAAAAGTGTCTAGTCAACTTAATTGAGAAGGTG
GCAAGTTATGGTGTGAAGCCAAGATATGGTCTAGTGACATATGCCACATACCCCAAAATT
TGGGTCAAAGTGTCTGAAGCAGACAGCAGTAATGCAGACTGGGTCACGAAGCAGCTCAAT
GAAATCAATTATGAAGACCACAAGTTGAAGTCAGGGACTAACACCAAGAAGGCCCTCCAG
GCAGTGTACAGCATGATGAGCTGGCCAGATGACGTCCCTCCTGAAGGCTGGAACCGCACC
CGCCATGTCATCATCCTCATGACTGATGGATTGCACAACATGGGCGGGGACCCAATTACT
GTCATTGATGAGATCCGGGACTTGCTATACATTGGCAAGGATCGCAAAAACCCAAGGGAG
GATTATCTGGATGTCTATGTGTTTGGGGTCGGGCCTTTGGTGAACCAAGTGAACATCAAT
GCTTTGGCTTCCAAGAAAGACAATGAGCAACATGTGTTCAAAGTCAAGGATATGGAAAAC
CTGGAAGATGTTTTCTACCAAATGATCGATGAAAGCCAGTCTCTGAGTCTCTGTGGCATG
GTTTGGGAACACAGGAAGGGTACCGATTACCACAAGCAACCATGGCAGGCCAAGATCTCA
GTCATTCGCCCTTCAAAGGGACACGAGAGCTGTATGGGGGCTGTGGTGTCTGAGTACTTT
GTGCTGACAGCAGCACATTGTTTCACTGTGGATGACAAGGAACACTCAATCAAGGTCAGC
GTAGGAGGGGAGAAGCGGGACCTGGAGATAGAAGTAGTCCTATTTCACCCCAACTACAAC
ATTAATGGGAAAAAAGAAGCAGGAATTCCTGAATTTTATGACTATGACGTTGCCCTGATC
AAGCTCAAGAATAAGCTGAAATATGGCCAGACTATCAGGCCCATTTGTCTCCCCTGCACC
GAGGGAACAACTCGAGCTTTGAGGCTTCCTCCAACTACCACTTGCCAGCAACAAAAGGAA
GAGCTGCTCCCTGCACAGGATATCAAAGCTCTGTTTGTGTCTGAGGAGGAGAAAAAGCTG
ACTCGGAAGGAGGTCTACATCAAGAATGGGGATAAGAAAGGCAGCTGTGAGAGAGATGCT
CAATATGCCCCAGGCTATGACAAAGTCAAGGACATCTCAGAGGTGGTCACCCCTCGGTTC
CTTTGTACTGGAGGAGTGAGTCCCTATGCTGACCCCAATACTTGCAGAGGTGATTCTGGC
GGCCCCTTGATAGTTCACAAGAGAAGTCGTTTCATTCAAGTTGGTGTAATCAGCTGGGGA
GTAGTGGATGTCTGCAAAAACCAGAAGCGGCAAAAGCAGGTACCTGCTCACGCCCGAGAC
TTTCACATCAACCTCTTTCAAGTGCTGCCCTGGCTGAAGGAGAAACTCCAAGATGAGGAT
TTGGGTTTTCTATAA
GenBank Gene ID
GeneCard IDNone
GenAtlas ID
HGNC ID
Chromosome Location6
Locus6p21.3
References
  1. Davrinche C, Abbal M, Clerc A: Molecular characterization of human complement factor B subtypes. Immunogenetics. 1990;32(5):309-12. [2249879 ]
  2. Mejia JE, Jahn I, de la Salle H, Hauptmann G: Human factor B. Complete cDNA sequence of the BF*S allele. Hum Immunol. 1994 Jan;39(1):49-53. [8181962 ]
  3. Schwaeble W, Luttig B, Sokolowski T, Estaller C, Weiss EH, Meyer zum Buschenfelde KH, Whaley K, Dippold W: Human complement factor B: functional properties of a recombinant zymogen of the alternative activation pathway convertase. Immunobiology. 1993 Jul;188(3):221-32. [8225386 ]
  4. Horiuchi T, Kim S, Matsumoto M, Watanabe I, Fujita S, Volanakis JE: Human complement factor B: cDNA cloning, nucleotide sequencing, phenotypic conversion by site-directed mutagenesis and expression. Mol Immunol. 1993 Dec;30(17):1587-92. [8247029 ]
  5. Xie T, Rowen L, Aguado B, Ahearn ME, Madan A, Qin S, Campbell RD, Hood L: Analysis of the gene-dense major histocompatibility complex class III region and its comparison to mouse. Genome Res. 2003 Dec;13(12):2621-36. [14656967 ]
  6. Mungall AJ, Palmer SA, Sims SK, Edwards CA, Ashurst JL, Wilming L, Jones MC, Horton R, Hunt SE, Scott CE, Gilbert JG, Clamp ME, Bethel G, Milne S, Ainscough R, Almeida JP, Ambrose KD, Andrews TD, Ashwell RI, Babbage AK, Bagguley CL, Bailey J, Banerjee R, Barker DJ, Barlow KF, Bates K, Beare DM, Beasley H, Beasley O, Bird CP, Blakey S, Bray-Allen S, Brook J, Brown AJ, Brown JY, Burford DC, Burrill W, Burton J, Carder C, Carter NP, Chapman JC, Clark SY, Clark G, Clee CM, Clegg S, Cobley V, Collier RE, Collins JE, Colman LK, Corby NR, Coville GJ, Culley KM, Dhami P, Davies J, Dunn M, Earthrowl ME, Ellington AE, Evans KA, Faulkner L, Francis MD, Frankish A, Frankland J, French L, Garner P, Garnett J, Ghori MJ, Gilby LM, Gillson CJ, Glithero RJ, Grafham DV, Grant M, Gribble S, Griffiths C, Griffiths M, Hall R, Halls KS, Hammond S, Harley JL, Hart EA, Heath PD, Heathcott R, Holmes SJ, Howden PJ, Howe KL, Howell GR, Huckle E, Humphray SJ, Humphries MD, Hunt AR, Johnson CM, Joy AA, Kay M, Keenan SJ, Kimberley AM, King A, Laird GK, Langford C, Lawlor S, Leongamornlert DA, Leversha M, Lloyd CR, Lloyd DM, Loveland JE, Lovell J, Martin S, Mashreghi-Mohammadi M, Maslen GL, Matthews L, McCann OT, McLaren SJ, McLay K, McMurray A, Moore MJ, Mullikin JC, Niblett D, Nickerson T, Novik KL, Oliver K, Overton-Larty EK, Parker A, Patel R, Pearce AV, Peck AI, Phillimore B, Phillips S, Plumb RW, Porter KM, Ramsey Y, Ranby SA, Rice CM, Ross MT, Searle SM, Sehra HK, Sheridan E, Skuce CD, Smith S, Smith M, Spraggon L, Squares SL, Steward CA, Sycamore N, Tamlyn-Hall G, Tester J, Theaker AJ, Thomas DW, Thorpe A, Tracey A, Tromans A, Tubby B, Wall M, Wallis JM, West AP, White SS, Whitehead SL, Whittaker H, Wild A, Willey DJ, Wilmer TE, Wood JM, Wray PW, Wyatt JC, Young L, Younger RM, Bentley DR, Coulson A, Durbin R, Hubbard T, Sulston JE, Dunham I, Rogers J, Beck S: The DNA sequence and analysis of human chromosome 6. Nature. 2003 Oct 23;425(6960):805-11. [14574404 ]
  7. Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. [15489334 ]
  8. Mole JE, Anderson JK, Davison EA, Woods DE: Complete primary structure for the zymogen of human complement factor B. J Biol Chem. 1984 Mar 25;259(6):3407-12. [6546754 ]
  9. Christie DL, Gagnon J: Amino acid sequence of the Bb fragment from complement Factor B. Sequence of the major cyanogen bromide-cleavage peptide (CB-II) and completion of the sequence of the Bb fragment. Biochem J. 1983 Jan 1;209(1):61-70. [6342610 ]
  10. Campbell RD, Porter RR: Molecular cloning and characterization of the gene coding for human complement protein factor B. Proc Natl Acad Sci U S A. 1983 Jul;80(14):4464-8. [6308626 ]
  11. Woods DE, Markham AF, Ricker AT, Goldberger G, Colten HR: Isolation of cDNA clones for the human complement protein factor B, a class III major histocompatibility complex gene product. Proc Natl Acad Sci U S A. 1982 Sep;79(18):5661-5. [6957884 ]
  12. Morley BJ, Campbell RD: Internal homologies of the Ba fragment from human complement component Factor B, a class III MHC antigen. EMBO J. 1984 Jan;3(1):153-7. [6323161 ]
  13. Wu LC, Morley BJ, Campbell RD: Cell-specific expression of the human complement protein factor B gene: evidence for the role of two distinct 5'-flanking elements. Cell. 1987 Jan 30;48(2):331-42. [3643061 ]
  14. Niemann MA, Bhown AS, Miller EJ: The principal site of glycation of human complement factor B. Biochem J. 1991 Mar 1;274 ( Pt 2):473-80. [2006911 ]
  15. Liu T, Qian WJ, Gritsenko MA, Camp DG 2nd, Monroe ME, Moore RJ, Smith RD: Human plasma N-glycoproteome analysis by immunoaffinity subtraction, hydrazide chemistry, and mass spectrometry. J Proteome Res. 2005 Nov-Dec;4(6):2070-80. [16335952 ]
  16. Chen R, Jiang X, Sun D, Han G, Wang F, Ye M, Wang L, Zou H: Glycoproteomics analysis of human liver tissue by combination of multiple enzyme digestion and hydrazide chemistry. J Proteome Res. 2009 Feb;8(2):651-61. doi: 10.1021/pr8008012. [19159218 ]
  17. Slade C, Bosco J, Unglik G, Bleasel K, Nagel M, Winship I: Deficiency in complement factor B. N Engl J Med. 2013 Oct 24;369(17):1667-9. doi: 10.1056/NEJMc1306326. [24152280 ]
  18. Jing H, Xu Y, Carson M, Moore D, Macon KJ, Volanakis JE, Narayana SV: New structural motifs on the chymotrypsin fold and their potential roles in complement factor B. EMBO J. 2000 Jan 17;19(2):164-73. [10637221 ]
  19. Milder FJ, Gomes L, Schouten A, Janssen BJ, Huizinga EG, Romijn RA, Hemrika W, Roos A, Daha MR, Gros P: Factor B structure provides insights into activation of the central protease of the complement system. Nat Struct Mol Biol. 2007 Mar;14(3):224-8. Epub 2007 Feb 25. [17310251 ]
  20. Janssen BJ, Gomes L, Koning RI, Svergun DI, Koster AJ, Fritzinger DC, Vogel CW, Gros P: Insights into complement convertase formation based on the structure of the factor B-cobra venom factor complex. EMBO J. 2009 Aug 19;28(16):2469-78. doi: 10.1038/emboj.2009.184. Epub 2009 Jul 2. [19574954 ]
  21. Gold B, Merriam JE, Zernant J, Hancox LS, Taiber AJ, Gehrs K, Cramer K, Neel J, Bergeron J, Barile GR, Smith RT, Hageman GS, Dean M, Allikmets R: Variation in factor B (BF) and complement component 2 (C2) genes is associated with age-related macular degeneration. Nat Genet. 2006 Apr;38(4):458-62. Epub 2006 Mar 5. [16518403 ]
  22. Goicoechea de Jorge E, Harris CL, Esparza-Gordillo J, Carreras L, Arranz EA, Garrido CA, Lopez-Trascasa M, Sanchez-Corral P, Morgan BP, Rodriguez de Cordoba S: Gain-of-function mutations in complement factor B are associated with atypical hemolytic uremic syndrome. Proc Natl Acad Sci U S A. 2007 Jan 2;104(1):240-5. Epub 2006 Dec 20. [17182750 ]
  23. Maga TK, Nishimura CJ, Weaver AE, Frees KL, Smith RJ: Mutations in alternative pathway complement proteins in American patients with atypical hemolytic uremic syndrome. Hum Mutat. 2010 Jun;31(6):E1445-60. doi: 10.1002/humu.21256. [20513133 ]

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