Table 1.
Physical and chemical characteristics of calcins
CalcinsFormulaAmino acidsMolecular massMolecular volumeNegatively charged residuesPositively charged residuesTheoretical isoelectric pointHydrophilicityRatio of hydrophilic residuesNet charge at pH 7.0PSA
   D Å3       Å2 
OpCa1 C153H261N59O47S6 33 3,871.5 2,762.6 4 (12%) 11 (33%) 9.7 1.1 58% 6.8 2,761 
OpCa2 C152H259N59O46S6 33 3,841.5 2,742.0 4 (12%) 11 (33%) 9.7 1.1 58% 6.8 2,733 
IpCa C148H254N58O45S6 33 3,758.4 2,783.7 4 (12%) 11 (33%) 9.7 1.0 52% 6.8 2,721 
MCa C156H270N56O46S6 33 3,858.6 2,781.9 4 (12%) 11 (33%) 9.6 1.0 55% 6.8 2,821 
HmCa C153H263N55O45S6 33 3,785.5 2,721.9 4 (12%) 11 (33%) 9.6 1.0 52% 6.8 2,765 
VjCa C149H254N56O47S6 33 3,774.4 2,692.7 3 (9%) 9 (27%) 9.3 0.7 55% 5.8 2,790 
UrCa C158H282N56O47S6 33 3,910.7 2,840.9 4 (12%) 13 (39%) 10.1 1.2 64% 8.7 2,965 
HdCa C164H282N64O53S6 35 4,190.8 3,001.9 5 (14%) 12 (34%) 9.7 1.2 66% 6.8 3,227 
CalcinsFormulaAmino acidsMolecular massMolecular volumeNegatively charged residuesPositively charged residuesTheoretical isoelectric pointHydrophilicityRatio of hydrophilic residuesNet charge at pH 7.0PSA
   D Å3       Å2 
OpCa1 C153H261N59O47S6 33 3,871.5 2,762.6 4 (12%) 11 (33%) 9.7 1.1 58% 6.8 2,761 
OpCa2 C152H259N59O46S6 33 3,841.5 2,742.0 4 (12%) 11 (33%) 9.7 1.1 58% 6.8 2,733 
IpCa C148H254N58O45S6 33 3,758.4 2,783.7 4 (12%) 11 (33%) 9.7 1.0 52% 6.8 2,721 
MCa C156H270N56O46S6 33 3,858.6 2,781.9 4 (12%) 11 (33%) 9.6 1.0 55% 6.8 2,821 
HmCa C153H263N55O45S6 33 3,785.5 2,721.9 4 (12%) 11 (33%) 9.6 1.0 52% 6.8 2,765 
VjCa C149H254N56O47S6 33 3,774.4 2,692.7 3 (9%) 9 (27%) 9.3 0.7 55% 5.8 2,790 
UrCa C158H282N56O47S6 33 3,910.7 2,840.9 4 (12%) 13 (39%) 10.1 1.2 64% 8.7 2,965 
HdCa C164H282N64O53S6 35 4,190.8 3,001.9 5 (14%) 12 (34%) 9.7 1.2 66% 6.8 3,227 

Summary of the physical and chemical characteristics of all eight known calcins, including formula, quantity of amino acids, molecular mass, molecular volume, negatively and positively charged amino acids, theoretical isoelectric point, hydrophilicity, ratio of hydrophilic residues, and net charge at pH 7.0. HdCa, hadrucalcin; HmCa, hemicalcin; IpCa, imperacalcin; MCa, maurocalcin; OpCa1, opicalcin1; OpCa2, opicalcin2; UrCa, urocalcin; VjCa, vejocalcin.

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