Molecular characterization of the sarcoplasmic calcium-binding protein (SCP) from crayfish Procambarus clarkii

Yongping Gao, Christopher M. Gillen, Michele G. Wheatly

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Sarcoplasmic Calcium-binding Protein (SCP) is believed to function as the invertebrate equivalent of vertebrate parvalbumin, namely to "buffer" cytosolic Ca2+. We have cloned and characterized a novel SCP from axial abdominal muscle of crayfish Procambarus clarkii (referred to as pcSCP1), and have examined tissue specific distribution and expression as a function of molting stage in non-epithelial and epithelial tissues. The complete sequence of pcSCP1 consists of 1052 bp with a 579 bp open reading frame, coding for 193 amino acid residues (molecular mass of 21.8 kDa). There is a 387 bp 3′ terminal non-coding region with a poly (A) tail. The deduced pcSCP1 protein sequence matched most closely with published SCP sequences from another crayfish Astacus leptodactylus (92.8%) and from shrimp (78.6-81.2%) and fruit fly (53%). Real-time PCR analysis confirmed that pcSCP1 is ubiquitously expressed in all tissues tested (gill, hepatopancreas, intestine, antennal gland, muscle); however it is most abundant in muscle particularly in the axial abdominal muscle. The real-time PCR analysis revealed that pcSCP1 expression is downregulated in pre- and postmolt stages compared with intermolt. Epithelial (hepatopancreas and antennal gland) SCP expression exhibited a more dramatic decrease than that observed in muscle. Expression trends for pcSCP1 paralleled published trends for sarco/endoplasmic reticular calcium ATPase (SERCA), suggesting that their cellular function in regulating intracellular Ca2+ is linked.

Original languageEnglish (US)
Pages (from-to)478-487
Number of pages10
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Issue number4
StatePublished - Aug 2006
Externally publishedYes


  • Crayfish
  • Procambarus clarkii
  • SCP, sarcoplasmic calcium-binding protein
  • SERCA, sarco/endoplasmic reticulum Ca ATPase

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology


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