Biology:CBS domain

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CBS domain
PDB 2nye EBI.png
Structure of the yeast SNF4 protein that contains four CBS domains.[1] This protein is part of the AMP-activated protein kinase (AMPK) complex.
Identifiers
SymbolCBS
PfamPF00571
InterProIPR000644
SMARTCBS
PROSITEPS51371
SCOP21zfj / SCOPe / SUPFAM
CDDcd02205

In molecular biology, the CBS domain is a protein domain found in a range of proteins in all species from bacteria to humans. It was first identified as a conserved sequence region in 1997 and named after cystathionine beta synthase, one of the proteins it is found in.[2] CBS domains are also found in a wide variety of other proteins such as inosine monophosphate dehydrogenase,[3] voltage gated chloride channels[4][5][6][7][8] and AMP-activated protein kinase (AMPK).[9][10] CBS domains regulate the activity of associated enzymatic and transporter domains in response to binding molecules with adenosyl groups such as AMP and ATP, or s-adenosylmethionine.[11]

Structure

The CBS domain is composed of a beta-alpha-beta-beta-alpha secondary structure pattern that is folded into a globular tertiary structure that contains a three-stranded antiparallel β-sheet with two α-helices on one side. CBS domains are always found in pairs in protein sequences and each pair of these domains tightly associate in a pseudo dimeric arrangement through their β-sheets forming a so-called CBS-pair or Bateman domain.[12][13] These CBS domain pairs can associate in a head-to-head (i.e. PDB codes 3KPC​, 1PVM​, 2OOX​) or a head-to-tail (i.e. PDB codes 1O50​, 1PBJ​) manner forming a disk-like compact structure. By doing so, they form clefts that constitute the canonical ligand binding regions.[14][15][16][17][18] In principle, the number of canonical binding sites matches the number of CBS domains within the molecule and are traditionally numbered according to the CBS domain that contains each of the conserved aspartate residues that potentially interact with the ribose of the nucleotides.[19] However, not all of these cavities might necessarily bind nucleotides or be functional. Recently, a non-canonical site for AMP has also been described in protein MJ1225 from M. jannaschii, though its functional role is still unknown.[20]

Multiple sequence alignment of CBS domains showing secondary structures above. Yellow arrows represent beta strands and red boxes alpha helices.

Ligand binding

It has been shown that CBS domains bind to adenosyl groups in molecules such as AMP and ATP,[11] or s-adenosylmethionine,[21] but they may also bind metallic ions such as Mg2+.[22][23] Upon binding these different ligands the CBS domains regulate the activity of associated enzymatic domains.[24] The molecular mechanisms underlying this regulation are just starting to be elucidated.[16][17][21][22][25] At the moment, two different type of mechanisms have been proposed. The first one claims that the nucleotide portion of the ligand induces essentially no change in the protein structure, the electrostatic potential at the binding site being the most significant property of adenosine nucleotide binding.[17][26] This "static" response would be involved in processes in which regulation by energy charge would be advantageous.[17][26] On the contrary, the second type of mechanism (denoted as "dynamic") involves dramatic conformational changes in the protein structure upon ligand binding and has been reported for the cytosolic domain of the Mg2+ transporter MgtE from Thermus thermophilus,[22] the unknown function protein MJ0100 from M. jannaschii [21][27] and the regulatory region of Clostridium perfringens pyrophosphatase.[28]

Associated domains

CBS domains are often found in proteins that contain other domains. These domains are usually enzymatic, membrane transporters or DNA-binding domains. However, proteins that contain only CBS domains are also often found, particularly in prokaryotes. These standalone CBS domain proteins might form complexes upon binding to other proteins such as kinases to which they interact with and regulate.

Example protein domains found associated with CBS domains

Mutations leading to disease

Mutations in some human CBS domain-containing proteins leads to genetic diseases.[3] For example, mutations in the cystathionine beta synthase protein lead to an inherited disorder of the metabolism called homocystinuria (Online Mendelian Inheritance in Man (OMIM) 236200).[29] Mutations in the gamma subunit of the AMPK enzyme have been shown to lead to familial hypertrophic cardiomyopathy with Wolff–Parkinson–White syndrome (Online Mendelian Inheritance in Man (OMIM) 600858). Mutations in the CBS domains of the IMPDH enzyme lead to the eye condition retinitis pigmentosa (Online Mendelian Inheritance in Man (OMIM) 180105).

Humans have a number of voltage-gated chloride channel genes, and mutations in the CBS domains of several of these have been identified as the cause of genetic diseases. Mutations in CLCN1 lead to myotonia (Online Mendelian Inheritance in Man (OMIM) 160800),[30] mutations in CLCN2 can lead to idiopathic generalised epilepsy (Online Mendelian Inheritance in Man (OMIM) 600699), mutations in CLCN5 can lead to Dent's disease (Online Mendelian Inheritance in Man (OMIM) 300009), mutations in CLCN7 can lead to osteopetrosis (Online Mendelian Inheritance in Man (OMIM) 259700),[31] and mutations in CLCNKB can lead to Bartter syndrome (Online Mendelian Inheritance in Man (OMIM) 241200).

References

  1. ↑ PDB: 2nye​; "Structure of the Bateman2 domain of yeast Snf4: dimeric association and relevance for AMP binding". Structure 15 (1): 65–74. January 2007. doi:10.1016/j.str.2006.11.014. PMID 17223533. 
  2. ↑ Bateman A (January 1997). "The structure of a domain common to archaebacteria and the homocystinuria disease protein". Trends Biochem. Sci. 22 (1): 12–3. doi:10.1016/S0968-0004(96)30046-7. PMID 9020585. 
  3. ↑ 3.0 3.1 "CBS domains: structure, function, and pathology in human proteins". Am. J. Physiol., Cell Physiol. 289 (6): C1369–78. December 2005. doi:10.1152/ajpcell.00282.2005. PMID 16275737. http://ajpcell.physiology.org/cgi/pmidlookup?view=long&pmid=16275737. 
  4. ↑ Ponting CP (March 1997). "CBS domains in CIC chloride channels implicated in myotonia and nephrolithiasis (kidney stones)". J. Mol. Med. 75 (3): 160–3. PMID 9106071. 
  5. ↑ "Crystal structure of the cytoplasmic domain of the chloride channel ClC-0". Structure 14 (2): 299–307. February 2006. doi:10.1016/j.str.2005.10.008. PMID 16472749. https://www.dora.lib4ri.ch/psi/islandora/object/psi%3A16076. 
  6. ↑ "Removal of gating in voltage-dependent ClC-2 chloride channel by point mutations affecting the pore and C-terminus CBS-2 domain". J. Physiol. 572 (Pt 1): 173–81. April 2006. doi:10.1113/jphysiol.2005.102392. PMID 16469788. 
  7. ↑ "The structure of the cytoplasmic domain of the chloride channel ClC-Ka reveals a conserved interaction interface". Structure 15 (6): 715–25. June 2007. doi:10.1016/j.str.2007.04.013. PMID 17562318. https://www.dora.lib4ri.ch/psi/islandora/object/psi%3A17831. 
  8. ↑ "Nucleotide recognition by the cytoplasmic domain of the human chloride transporter ClC-5". Nat. Struct. Mol. Biol. 14 (1): 60–7. January 2007. doi:10.1038/nsmb1188. PMID 17195847. 
  9. ↑ "Structure of a CBS-domain pair from the regulatory gamma1 subunit of human AMPK in complex with AMP and ZMP". Acta Crystallogr. D 63 (Pt 5): 587–96. May 2007. doi:10.1107/S0907444907009110. PMID 17452784. 
  10. ↑ "Structure of the Bateman2 domain of yeast Snf4: dimeric association and relevance for AMP binding". Structure 15 (1): 65–74. January 2007. doi:10.1016/j.str.2006.11.014. PMID 17223533. 
  11. ↑ 11.0 11.1 Kemp BE (January 2004). "Bateman domains and adenosine derivatives form a binding contract". J. Clin. Invest. 113 (2): 182–4. doi:10.1172/JCI20846. PMID 14722609. 
  12. ↑ Kemp BE (January 2004). "Bateman domains and adenosine derivatives form a binding contract". J. Clin. Invest. 113 (2): 182–4. doi:10.1172/JCI20846. PMID 14722609. 
  13. ↑ "Characteristics and crystal structure of bacterial inosine-5'-monophosphate dehydrogenase". Biochemistry 38 (15): 4691–700. April 1999. doi:10.1021/bi982858v. PMID 10200156. 
  14. ↑ "Structure of the Bateman2 domain of yeast Snf4: dimeric association and relevance for AMP binding". Structure 15 (1): 65–74. January 2007. doi:10.1016/j.str.2006.11.014. PMID 17223533. 
  15. ↑ "Nucleotide recognition by the cytoplasmic domain of the human chloride transporter ClC-5". Nat. Struct. Mol. Biol. 14 (1): 60–7. January 2007. doi:10.1038/nsmb1188. PMID 17195847. 
  16. ↑ 16.0 16.1 "Crystal structure of the heterotrimer core of Saccharomyces cerevisiae AMPK homologue SNF1". Nature 449 (7161): 492–5. September 2007. doi:10.1038/nature06127. PMID 17851534. 
  17. ↑ 17.0 17.1 17.2 17.3 "Crystal structures of the adenylate sensor from fission yeast AMP-activated protein kinase". Science 315 (5819): 1726–9. March 2007. doi:10.1126/science.1137503. PMID 17289942. 
  18. ↑ "Structural insight into AMPK regulation: ADP comes into play". Structure 15 (10): 1285–95. October 2007. doi:10.1016/j.str.2007.07.017. PMID 17937917. 
  19. ↑ "AMPK structure and regulation from three angles". Structure 15 (10): 1161–3. October 2007. doi:10.1016/j.str.2007.09.006. PMID 17937905. 
  20. ↑ "The Crystal Structure of Protein MJ1225 from Methanocaldococcus jannaschii Shows Strong Conservation of Key Structural Features Seen in the Eukaryal gamma-AMPK". J Mol Biol 399 (1): 53–70. May 2010. doi:10.1016/j.jmb.2010.03.045. PMID 20382158. 
  21. ↑ 21.0 21.1 21.2 "Binding of S-methyl-5'-thioadenosine and S-adenosyl-L-methionine to protein MJ0100 triggers an open-to-closed conformational change in its CBS motif pair". J. Mol. Biol. 396 (3): 800–20. February 2010. doi:10.1016/j.jmb.2009.12.012. PMID 20026078. 
  22. ↑ 22.0 22.1 22.2 "Mg2+-sensing mechanism of Mg2+ transporter MgtE probed by molecular dynamics study". Proc. Natl. Acad. Sci. U.S.A. 105 (40): 15393–8. October 2008. doi:10.1073/pnas.0802991105. PMID 18832160. 
  23. ↑ "[Structural basis for the mechanism of Mg2 homeostasis by MgtE transporter]" (in ja). Tanpakushitsu Kakusan Koso 53 (3): 242–8. March 2008. PMID 18326297. 
  24. ↑ "CBS domains form energy-sensing modules whose binding of adenosine ligands is disrupted by disease mutations". J. Clin. Invest. 113 (2): 274–84. January 2004. doi:10.1172/JCI19874. PMID 14722619. 
  25. ↑ "Crystal structures of the CBS and DRTGG domains of the regulatory region of Clostridiumperfringens pyrophosphatase complexed with the inhibitor, AMP, and activator, diadenosine tetraphosphate". J. Mol. Biol. 398 (3): 400–13. May 2010. doi:10.1016/j.jmb.2010.03.019. PMID 20303981. 
  26. ↑ 26.0 26.1 "Structural basis for AMP binding to mammalian AMP-activated protein kinase". Nature 449 (7161): 496–500. September 2007. doi:10.1038/nature06161. PMID 17851531. 
  27. ↑ "Purification, crystallization and preliminary X-ray diffraction analysis of the CBS-domain pair from the Methanococcus jannaschii protein MJ0100". Acta Crystallographica Section F 64 (Pt 10): 936–41. October 2008. doi:10.1107/S1744309108027930. PMID 18931440. 
  28. ↑ "Crystal Structures of the CBS and DRTGG Domains of the Regulatory Region of Clostridium perfringens Pyrophosphatase Complexed with the Inhibitor, AMP, and Activator, Diadenosine Tetraphosphate". J Mol Biol 398 (3): 400–413. May 2010. doi:10.1016/j.jmb.2010.03.019. PMID 20303981. 
  29. ↑ "Mutations in the regulatory domain of cystathionine beta synthase can functionally suppress patient-derived mutations in cis". Hum. Mol. Genet. 10 (6): 635–43. March 2001. doi:10.1093/hmg/10.6.635. PMID 11230183. 
  30. ↑ Pusch M (April 2002). "Myotonia caused by mutations in the muscle chloride channel gene CLCN1". Hum. Mutat. 19 (4): 423–34. doi:10.1002/humu.10063. PMID 11933197. 
  31. ↑ "Albers-Schönberg disease (autosomal dominant osteopetrosis, type II) results from mutations in the ClCN7 chloride channel gene". Hum. Mol. Genet. 10 (25): 2861–7. December 2001. doi:10.1093/hmg/10.25.2861. PMID 11741829. 



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