Alpha-lactalbumin

NameAlpha-lactalbumin
Synonyms
  • Lactose synthase B protein
  • Lysozyme-like protein 7
  • LYZL7
Gene NameLALBA
OrganismHuman
Amino acid sequence
>lcl|BSEQ0012504|Alpha-lactalbumin
MRFFVPLFLVGILFPAILAKQFTKCELSQLLKDIDGYGGIALPELICTMFHTSGYDTQAI
VENNESTEYGLFQISNKLWCKSSQVPQSRNICDISCDKFLDDDITDDIMCAKKILDIKGI
DYWLAHKALCTEKLEQWLCEKL
Number of residues142
Molecular Weight16224.695
Theoretical pINot Available
GO Classification
Functions
  • lactose synthase activity
  • calcium ion binding
Processes
  • small molecule metabolic process
  • carbohydrate metabolic process
  • apoptotic process
  • defense response to bacterium
  • lactose biosynthetic process
  • signal transduction
  • cell-cell signaling
Components
  • Golgi membrane
  • Golgi lumen
  • extracellular space
General FunctionLactose synthase activity
Specific FunctionRegulatory subunit of lactose synthase, changes the substrate specificity of galactosyltransferase in the mammary gland making glucose a good acceptor substrate for this enzyme. This enables LS to synthesize lactose, the major carbohydrate component of milk. In other tissues, galactosyltransferase transfers galactose onto the N-acetylglucosamine of the oligosaccharide chains in glycoproteins.
Pfam Domain Function
Transmembrane RegionsNot Available
GenBank Protein IDNot Available
UniProtKB IDP00709
UniProtKB Entry NameLALBA_HUMAN
Cellular LocationSecreted
Gene sequence
>lcl|BSEQ0012505|Alpha-lactalbumin (LALBA)
ATGAGGTTCTTTGTCCCTCTGTTCCTGGTGGGCATCCTGTTCCCTGCCATCCTGGCCAAG
CAATTCACAAAATGTGAGCTGTCCCAGCTGCTGAAAGACATAGATGGTTATGGAGGCATC
GCTTTGCCTGAATTGATCTGTACCATGTTTCACACCAGTGGTTATGACACACAAGCCATA
GTTGAAAACAATGAAAGCACGGAATATGGACTCTTCCAGATCAGTAATAAGCTTTGGTGC
AAGAGCAGCCAGGTCCCTCAGTCAAGGAACATCTGTGACATCTCCTGTGACAAGTTCCTG
GATGATGACATTACTGATGACATAATGTGTGCCAAGAAGATCCTGGATATTAAAGGAATT
GACTACTGGTTGGCCCATAAAGCCCTCTGCACTGAGAAGCTGGAACAGTGGCTTTGTGAG
AAGTTGTGA
GenBank Gene IDNot Available
GeneCard IDNot Available
GenAtlas IDNot Available
HGNC IDHGNC:6480
Chromosome Location12
LocusNot Available
References
  1. Hall L, Craig RK, Edbrooke MR, Campbell PN: Comparison of the nucleotide sequence of cloned human and guinea-pig pre-alpha-lactalbumin cDNA with that of chick pre-lysozyme cDNA suggests evolution from a common ancestral gene. Nucleic Acids Res. 1982 Jun 11;10(11):3503-15. 6285305
  2. Hall L, Emery DC, Davies MS, Parker D, Craig RK: Organization and sequence of the human alpha-lactalbumin gene. Biochem J. 1987 Mar 15;242(3):735-42. 2954544
  3. 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
  4. Findlay JB, Brew K: The complete amino-acid sequence of human -lactalbumin. Eur J Biochem. 1972 May;27(1):65-86. 5049057
  5. Maynard F: Identification of a new molecular form of human alpha-lactalbumin. J Dairy Res. 1992 Aug;59(3):425-9. 1401360
  6. Picariello G, Ferranti P, Mamone G, Roepstorff P, Addeo F: Identification of N-linked glycoproteins in human milk by hydrophilic interaction liquid chromatography and mass spectrometry. Proteomics. 2008 Sep;8(18):3833-47. doi: 10.1002/pmic.200701057. 18780401
  7. Acharya KR, Ren JS, Stuart DI, Phillips DC, Fenna RE: Crystal structure of human alpha-lactalbumin at 1.7 A resolution. J Mol Biol. 1991 Sep 20;221(2):571-81. 1920433
  8. Ren J, Stuart DI, Acharya KR: Alpha-lactalbumin possesses a distinct zinc binding site. J Biol Chem. 1993 Sep 15;268(26):19292-8. 8366079
  9. Chandra N, Brew K, Acharya KR: Structural evidence for the presence of a secondary calcium binding site in human alpha-lactalbumin. Biochemistry. 1998 Apr 7;37(14):4767-72. 9537992
  10. Harata K, Abe Y, Muraki M: Crystallographic evaluation of internal motion of human alpha-lactalbumin refined by full-matrix least-squares method. J Mol Biol. 1999 Mar 26;287(2):347-58. 10080897
  11. Chowanadisai W, Kelleher SL, Nemeth JF, Yachetti S, Kuhlman CF, Jackson JG, Davis AM, Lien EL, Lonnerdal B: Detection of a single nucleotide polymorphism in the human alpha-lactalbumin gene: implications for human milk proteins. J Nutr Biochem. 2005 May;16(5):272-8. 15866226