Looks to be a legal connection, 45min for a JU to JU connection is ok as per below.
AC should therefore be able to check your luggage through to your final destination.
Results from ExpertFlyer.com
Code:
Minimum Connect Times:
Connecting at BEG
Incoming airline JU
Outgoing airline JU
STANDARD.D/D...D/I...I/D...I/I.
ONLINE .30 1.15 1.15 1.10
OFFLINE .30 1.15 1.15 1.10
** OR * ARE ALL
**-** DI .45 ALL - GROUP3
**-** ID .45 GROUP3 - ALL
JU-JU II .40 BEY - SVO OPN -24OCT15
JU-JU II .40 BRU - IST OPN -24OCT15
JU-JU II .40 IST - TXL OPN -24OCT15
JU-JU II .40 IST - ARN OPN -24OCT15
JU-JU II .40 SVO - FCO OPN -24OCT15
JU-JU II .40 SVO - SPU OPN -24OCT15
JU-JU II .40 ARN - BEY OPN -24OCT15
JU-JU II .45 ALL - GROUP3
JU-JU II .45 GROUP3 - ALL
JU-JU II .45
**-** II .45 GROUP3 - GROUP3
**-** II 1.00 ALL - GROUP3
**-** II 1.00 GROUP3 - ALL
USE T*GRPN FOR CITIES IN A GROUP. WHERE N IS THE GRP NUMBER.